pure substance is a substance have constant composulition and uniform properties throught a sample what througt a sample mean?​

Answers

Answer 1

Answer:

Matter that has the same composition and properties throughout is called a substance.

Explanation:


Related Questions

balance the chemical equation for the reaction of perchloric acid (hclo4) with tetraphosphorus decaoxide to form phosphoric acid and dichlorine heptaoxide. the unbalanced equation is

Answers

The unbalanced chemical equation for the reaction of perchloric acid with tetraphosphorus decaoxide is: HCLO4 + P4O10 → H3PO4 + Cl2O7. To balance this equation, the number of atoms of each element on both sides of the equation must be equal.

Here are the steps involved in balancing the chemical equation for the reaction of perchloric acid (HCLO4) with tetraphosphorus decaoxide (P4O10) to form phosphoric acid (H3PO4) and dichlorine heptaoxide (Cl2O7):

Step 1: Count the number of atoms of each element on both sides of the equation.

Step 2: Balance the elements that occur in only one compound.

Step 3: Balance the elements that occur in more than one compound.

Step 4: Check to ensure that all elements have been balanced.

Step 5: Balance the equation by multiplying the coefficients by the smallest possible integers to ensure that all coefficients are whole numbers.

The balanced chemical equation for the reaction of perchloric acid (HCLO4) with tetraphosphorus decaoxide (P4O10) to form phosphoric acid (H3PO4) and dichlorine heptaoxide (Cl2O7) is: 2HCLO4 + P4O10 → 4H3PO4 + 2Cl2O7.

To know more about perchloric acid visit

https://brainly.com/question/30780596

#SPJ11

Suppose your laboratory instructor inadvertently gave you sample of KHP contaminated with NaCl t0 USC In standardizing your NaOH: How would this affect the molarity YOu calculated for your NaOH solu- tion? Justify your unswer, NAOHM 0.1929 ane P ' :' ^ How many grams of NaOH are needed t0 prepare 5O0 mL of 0,125 M NaOH?

Answers

2.5 grams of NaOH is required to prepare 500 mL of 0.125 M NaOH solution.

The presence of NaCl in the KHP sample given to standardize NaOH would lead to a falsely high calculated molarity of NaOH. This is because NaCl and KHP would react with NaOH, thereby consuming NaOH, leading to a low molarity of NaOH. To calculate the correct molarity of NaOH, it is essential to take into account the added NaCl in the KHP sample.For the preparation of 500mL of 0.125M NaOH, the steps to be followed are as follows;Step 1: Calculate the number of moles of NaOH required.Molarity = Number of moles / Volume of solution (L)0.125 M = Number of moles / 0.5 LNumber of moles = 0.125 M × 0.5 LNumber of moles = 0.0625 moles of NaOHStep 2: Convert the number of moles of NaOH to grams using the formula;Mass = Number of moles × Molar mass Mass = 0.0625 moles × 40 g/molMass = 2.5 grams.

for more question on NaOH

https://brainly.com/question/14790461

#SPJ8

CaSO4 x 1/2 H2O, in airtight containers to prevent it from
absorbing water vapor from the air and changing to
gypsum, CaSO4 x 2H2O How many liters of water
vapor evolve when 2.00 kg of gypsum are heated at
110°C to produce plaster of Paris? At 110°C, the
density of water vapor is 0.574 g/L.

Answers

When 2.00 kg of gypsum is heated at 110°C, approximately 467.65 liters of water vapor will evolve.

To determine the volume of water vapor evolved when 2.00 kg of gypsum (CaSO4 x 2H2O) is heated, we need to calculate the number of moles of water vapor and then convert it to liters using the given density.

The molar mass of CaSO4 x 2H2O is calculated as follows:

Ca: 40.08 g/mol

S: 32.07 g/mol

O (4 atoms): 16.00 g/mol x 4 = 64.00 g/mol

H (2 atoms): 1.01 g/mol x 2 = 2.02 g/mol

Total molar mass = 40.08 + 32.07 + 64.00 + 2.02 = 138.17 g/mol

Now, we can calculate the number of moles of gypsum:

Number of moles = Mass / Molar mass = 2000 g / 138.17 g/mol = 14.47 mol

From the balanced chemical equation for the conversion of gypsum to plaster of Paris, we know that one mole of gypsum produces one mole of water vapor. Therefore, 14.47 moles of gypsum will produce 14.47 moles of water vapor.

To convert moles of water vapor to liters, we can use the ideal gas law:

PV = nRT

At 110°C, the temperature T can be converted to Kelvin: T = 110 + 273.15 = 383.15 K

The pressure P is not given, but we can assume standard atmospheric pressure (1 atm) in an airtight container.

R is the ideal gas constant (0.0821 L·atm/(mol·K))

Plugging in the values, we can rearrange the ideal gas law to solve for the volume V:

V = nRT / P = (14.47 mol) * (0.0821 L·atm/(mol·K)) * (383.15 K) / (1 atm) = 467.65 L

To learn more about balanced chemical equation click here:

brainly.com/question/14072552

#SPJ11

what would be the mass in grams of 1.505 x 10^23 molecules of carbon disulfide

Answers

The mass in grams of 1.505 x 10^23 molecules of carbon disulfide (CS2) is approximately 19.04 grams, calculated by converting the number of molecules to moles and multiplying by the molar mass of CS2.

To determine the mass in grams, we need to convert the number of molecules to moles and then multiply by the molar mass of carbon disulfide. The molar mass of CS2 can be calculated by summing the atomic masses of carbon (C) and two sulfur (S) atoms.

1. Calculate the molar mass of CS2:

  - Atomic mass of carbon (C) = 12.01 g/mol

  - Atomic mass of sulfur (S) = 32.07 g/mol

  - Molar mass of CS2 = (12.01 g/mol) + 2 * (32.07 g/mol) = 76.14 g/mol

2. Convert the number of molecules to moles:

  - Number of molecules = 1.505 x 10^23

  - Moles of CS2 = Number of molecules / Avogadro's number = 1.505 x 10^23 / 6.022 x 10^23 mol^-1 ≈ 0.25 moles

3. Calculate the mass in grams:

  - Mass in grams = Moles of CS2 * Molar mass of CS2 = 0.25 moles * 76.14 g/mol ≈ 19.04 grams

Therefore, the mass in grams of 1.505 x 10^23 molecules of carbon disulfide is approximately 19.04 grams.

To learn more about molar mass click here: brainly.com/question/31545539

#SPJ11

what is the empirical formula of the compound with the molecular formula c18h36 ? what is the empirical formula of the compound with the molecular formula ? ch2 c9h20 ch3 c3h8

Answers

An empirical formula represents the simplest ratio of elements in a compound. It can be determined from the molecular formula by dividing all subscripts by the greatest common factor. The molecular formula for a compound with the formula C18H36 is the ratio of the number of atoms of carbon and hydrogen.

Therefore, to determine the empirical formula of the compound, divide the subscripts by their greatest common factor:  C18H36  = C9H18  - Divide by 2  = C3H6  - Divide by 3Empirical Formula = C3H6 The empirical formula of a compound with the molecular formula CH2 is CH2. There is no further simplification possible. The empirical formula of a compound with the molecular formula C9H20 is C3H7, as shown below. To determine the empirical formula of the compound, divide the subscripts by their greatest common factor: C9H20 = C3H7 - Divide by 3Empirical Formula = C3H7. The empirical formula of a compound with the molecular formula C3H8 is C3H8. There is no further simplification possible.

To know more about molecular formula visit

https://brainly.com/question/29435366

#SPJ11

Caffeine (C8H10N4O2) is a weak base with a pKb of 10.4. Calculate the pH of a solution containing 455 mg/L of caffeine.

Answers

The pH of a solution containing 455 mg/L of caffeine is approximately 7.08.

To calculate the pH of a solution containing 455 mg/L of caffeine, we need to consider the dissociation of caffeine as a weak base and its equilibrium with water. The given pKb value of caffeine is 10.4.

Step 1: Convert the concentration of caffeine to moles per liter (Molarity):

The molar mass of caffeine (C8H10N4O2) can be calculated as follows:

12.01 g/mol (C) × 8 + 1.01 g/mol (H) × 10 + 14.01 g/mol (N) × 4 + 16.00 g/mol (O) × 2 = 194.19 g/mol

To convert 455 mg/L to moles per liter (Molarity), we divide by the molar mass:

455 mg/L ÷ 194.19 g/mol = 2.347 × 10^-3 mol/L

Step 2: Calculate the concentration of hydroxide ions (OH-) using the pKb value:

pKb = -log(Kb)

10.4 = -log(Kb)

Kb = 10^(-10.4)

Since Kb is the equilibrium constant for the reaction of caffeine as a base, we can write the following equation:

C8H10N4O2 (aq) + H2O (l) ⇌ C8H10N4O2H+ (aq) + OH- (aq)

The initial concentration of OH- is assumed to be zero. At equilibrium, the concentration of OH- is equal to [OH-].

Step 3: Calculate the concentration of OH- at equilibrium:

Kb = [C8H10N4O2H+][OH-] / [C8H10N4O2]

Since the concentration of OH- at equilibrium is equal to Kb, we can write:

Kb = [OH-]^2 / [C8H10N4O2]

[OH-] = √(Kb × [C8H10N4O2])

Substituting the values, we get:

[OH-] = √(10^(-10.4) × 2.347 × 10^-3)

[OH-] ≈ 1.217 × 10^-7 mol/L

Step 4: Calculate the concentration of H+ (hydrogen ions) using the Kw (ion product of water):

Kw = [H+][OH-]

1.0 × 10^-14 = [H+][1.217 × 10^-7]

[H+] ≈ 8.214 × 10^-8 mol/L

Step 5: Calculate the pH:

pH = -log[H+]

pH = -log(8.214 × 10^-8)

pH ≈ 7.08

Learn more about caffeine at: brainly.com/question/31830048

#SPJ11

What atomic or hybrid orbitals make up the sigma bond between c2 and c3 in propylene, ch2chch3? (c2 is the second carbon in the structure as written. )

Answers

The sigma bond between C2 and C3 in propylene (CH2CHCH3) is formed by a hybrid orbital of carbon atom and a hybrid orbital of a neighboring carbon atom. The hybridization of carbon atoms is sp2. Hybrid orbitals are formed when atomic orbitals mix to form new orbitals that result from bonding.

This hybridization provides a basis for the building of the σ bonding framework in propylene. In propylene, each carbon atom is connected to two other atoms. The carbon atom in the center of the molecule, C2, is bonded to two other carbon atoms and one hydrogen atom. It has an sp2 hybridization. The sigma bond between C2 and C3 is formed between an sp2 hybrid orbital of C2 and an sp2 hybrid orbital of C3.

The third carbon atom, C1, is also sp2 hybridized, but the shape of the orbitals is different. The orbitals of C1 and C2 have a planar structure, but the orbital shape of C3 is distorted due to the presence of the methyl group on C3. The hybridization of the methyl group's carbon atom is sp3, which results in the formation of a tetrahedral shape around the carbon atom. Therefore, the σ bond between C2 and C3 is formed by the overlap of two sp2 hybrid orbitals.

To know more about atomic orbitals visit

https://brainly.com/question/28240666

#SPJ11

Which element has the highest boiling point at standard pressure.

Answers

Answer:

The chemical element with the lowest boiling point is Helium and the element with the highest boiling point is Tungsten.

a sample of a radioactive substance decayed to 94% of its original amount after a year. (round your answers to two decimal places.) (a) what is the half-life of the substance? 11.2 correct: your answer is correct. yr (b) how long would it take the sample to decay to 80% of its original amount?

Answers

To determine the time it would take for the sample to decay to 80% of its original amount, we can use the concept of half-life.

(a) Half-life calculation:

Since the substance decayed to 94% of its original amount after a year, we can set up the following equation:

0.94 = (1/2)^(t/h)

where "t" is the time elapsed and "h" is the half-life.

Solving for "h" using logarithms:

log(0.94) = (t/h) * log(1/2)

h = t / (log(1/2) / log(0.94))

h ≈ t / (-0.3010 / -0.0253)

h ≈ t / 11.9022

h ≈ 0.084 t

The half-life of the substance is approximately 0.084 times the time it takes for the substance to decay to 94% of its original amount.

(b) Decay to 80% calculation:

To find the time it would take for the sample to decay to 80% of its original amount, we need to determine the value of "t" in the equation:

0.80 = (1/2)^(t/h)

Using logarithms, we can solve for "t":

log(0.80) = (t/h) * log(1/2)

t/h = log(0.80) / log(1/2)

t ≈ (log(0.80) / log(1/2)) * h

t ≈ (log(0.80) / log(1/2)) * 0.084 t

Calculating the approximate value:

t ≈ (log(0.80) / log(1/2)) * 0.084 t

t ≈ (0.0969 / -0.3010) * 0.084 t

t ≈ -0.322 t

Therefore, it would take approximately -0.322 times the half-life (or approximately 0.322 times the half-life in the reverse direction) for the sample to decay to 80% of its original amount.

Note: The negative sign arises because we are calculating the time in the reverse direction from the final amount. However, in practice, time cannot be negative, so we consider the absolute value of the result.

Please note that the approximate values obtained depend on the given values and the assumptions made.

To know more about decayed visit:

brainly.com/question/32086007

#SPJ11

help plz!!! THANK YOU!!!

Answers

ok what do you need help with

21-8 0.38 pts what happens to the number of mo's as the number of atoms that come together increases?

Answers

When the number of atoms that come together increases, the number of molecular orbitals (MOs) also increases. When two atomic orbitals overlap and create a bond, two MOs are formed. Similarly, when three atomic orbitals overlap and create a bond, three MOs are formed, and so on.

Therefore, as the number of atoms that come together increases, the number of MOs also increases.Explanation:A molecular orbital (MO) is formed by the overlap of atomic orbitals on adjacent atoms. The number of MOs that are formed depends on the number of atomic orbitals that overlap. When two atomic orbitals overlap, two MOs are formed. One is called the bonding MO, and the other is called the antibonding MO.

When three atomic orbitals overlap, three MOs are formed. One is the bonding MO, one is the nonbonding MO, and one is the antibonding MO. Similarly, when four atomic orbitals overlap, four MOs are formed: two bonding MOs, one nonbonding MO, and one antibonding MO. And so on.

To know more about orbitals, visit:

https://brainly.com/question/32355752

#SPJ11

help hurry will mark Brainliest

Answers

Answer:

b

Explanation:

its oviouse man/girl

Answer: B. A net force that points to the right

Explanation: If the girls are stronger than the boys, then the rope would move to the right, BUT if the boys are stronger than the girls, then the rope would move to the left. The answer is obvious because if you look carefully, you can see that the girls are bigger than the boys, and they are more spread out rather than all in one spot.

Which of the following aqueous solutions contains the greatest number of ions?
a. 400 mL of 0,10 M KCL
b. 300 mL of 0,10 M SrCl2
c. 200 mL of 0,10 M FeCl3
d. 200 mL of 0,20 M NaCl
e. 800 mL of 0,10 M I2

Answers

Option b, 300 mL of 0.10 M SrCl₂, contains the greatest number of ions.

When SrCl₂ dissociates in water, it breaks into one Sr²⁺ ion and two Cl⁻ ions. Since the molarity of SrCl₂ is 0.10 M, it means there are 0.10 moles of SrCl₂ in 1 liter of solution. In 300 mL (0.3 L) of this solution, there will be 0.03 moles of SrCl₂. For each mole of SrCl₂, we get one Sr²⁺ ion and two Cl⁻ ions. Therefore, in the given volume, we have 0.03 moles of Sr²⁺ ions and 0.06 moles of Cl⁻ ions.

In comparison, options a, d, and e all contain only 0.03 moles of ions in their respective volumes. Option c, with FeCl₃, would produce 0.04 moles of ions (one Fe³⁺ ion and three Cl⁻ ions) in the given volume.

Hence, option b, 300 mL of 0.10 M SrCl₂, contains the greatest number of ions with a total of 0.03 moles of Sr²⁺ ions and 0.06 moles of Cl⁻ ions.

Learn more about ions at https://brainly.com/question/13692734

#SPJ11

which statement is true about effective nuclear charge? a. effective nuclear charge decreases as you move to the right across a row in the periodic table. b. effective nuclear charge decreases then increases at regular intervals as you move to the right across a row in the periodic table. c. effective nuclear charge remains relatively constant as you move to the right across a row in the periodic table. d. effective nuclear charge increases as you move to the right across a row in the periodic table.

Answers

Effective nuclear charge increases as you move to the right across a row in the periodic table.

Effective nuclear charge is the nuclear charge that's felt by an electron due to the presence of other electrons in an atom.

Effective nuclear charge (Zeff) varies based on the number of protons in the nucleus and the shielding effect from inner electrons.

Option D is the correct statement that shows the increase in effective nuclear charge as you move to the right across a row in the periodic table.

The effective nuclear charge of an atom is proportional to its nuclear charge (Z) and the average amount of shielding electrons.

However, as we move to the right side of the periodic table, the number of protons in the nucleus increases, causing the electrons in the same energy level to experience a greater attractive force.

In the periodic table, the effective nuclear charge (Zeff) felt by the valence electrons of an atom rises as we go from left to right across a period.

This is caused by an increase in the nuclear charge, which means that the valence electrons are more tightly bound to the nucleus and are thus more difficult to remove.

The periodic table has been arranged in such a way that the elements are arranged in order of their atomic numbers. As a result, the elements are arranged in a pattern that is consistent with their properties.

Effective nuclear charge increases as you move to the right across a row in the periodic table.

As we go from left to right across the periodic table, the effective nuclear charge experienced by the valence electrons of an atom grows because the atomic number of the elements increases. As a result, effective nuclear charge increases as we move from left to right across a period.

To know more about shielding effect visit:

brainly.com/question/28060366

#SPJ11

at equilibrium, the partial pressure of so2 is 22.2 atm and that of o2 is 10.1 atm. the partial pressure of so3 is ________ atm.

Answers

At equilibrium, the partial pressure of SO3 can be calculated using the principles of the equilibrium constant expression. The partial pressure of SO3 is 2.02 atm.

The equilibrium constant expression for the reaction involved can be written as:

Kp = (P(SO3)) / (P(SO2) * P(O2))

Given the partial pressures of SO2 and O2 as 22.2 atm and 10.1 atm, respectively, we can substitute these values into the equilibrium constant expression:

Kp = (P(SO3)) / (22.2 atm * 10.1 atm)

To determine the partial pressure of SO3, we rearrange the equation:

P(SO3) = Kp * (P(SO2) * P(O2))

Substituting the given values:

P(SO3) = 2.02 atm * (22.2 atm * 10.1 atm)

P(SO3) ≈ 2.02 atm

Therefore, the partial pressure of SO3 at equilibrium is approximately 2.02 atm. This calculation is based on the equilibrium constant expression, which relates the partial pressures of the reactants and products at equilibrium.

To learn more about equilibrium constant expression click here: brainly.com/question/29748652

#SPJ11

What is the difference between liquid water and water vapor?

1.They differ in their number and types of atoms.
2.They are different types of chemical compounds.
3.They have different arrangements of atoms in their molecules.
4.They are different states of the same pure substance.

Answers

Answer:

4

Explanation:

4.They are different states of the same pure substance

Write electron configurations for the following atoms and ions, and comment on the result.
A. Ar
B. Cl^-
C. S^2-
D. P^3-

Answers

A. The electron configuration for argon (Ar) is 1s² 2s² 2p⁶ 3s² 3p⁶. B. for chloride ion (Cl⁻) is 1s² 2s² 2p⁶ 3s² 3p⁶. C.for sulfide ion (S²⁻) is 1s² 2s² 2p⁶ 3s² 3p⁶. D. for phosphide ion (P³⁻) is 1s² 2s² 2p⁶ 3s² 3p⁶.

A. The electron configuration for argon (Ar) is 1s² 2s² 2p⁶ 3s² 3p⁶. Argon is a noble gas with a completely filled valence shell, consisting of 8 electrons in the 3s and 3p orbitals. The noble gas configuration makes argon stable and unreactive. B. The electron configuration for chloride ion (Cl⁻) is 1s² 2s² 2p⁶ 3s² 3p⁶. When chlorine gains one electron to form the chloride ion, it acquires a stable noble gas configuration similar to argon. The additional electron occupies the 3p orbital, resulting in a full valence shell of 8 electrons. The chloride ion has a stable electronic configuration, making it more stable than the chlorine atom and less likely to react.

C. The electron configuration for sulfide ion (S²⁻) is 1s² 2s² 2p⁶ 3s² 3p⁶. Similar to the chloride ion, sulfur gains two electrons to form the sulfide ion. The additional electrons occupy the 3p orbitals, resulting in a stable noble gas configuration with a full valence shell of 8 electrons. The sulfide ion has a stable electron configuration, making it more stable than the sulfur atom and less likely to react. D. The electron configuration for phosphide ion (P³⁻) is 1s² 2s² 2p⁶ 3s² 3p⁶. Phosphorus gains three electrons to form the phosphide ion. The additional electrons occupy the 3p orbitals, resulting in a stable noble gas configuration with a full valence shell of 8 electrons. The phosphide ion has a stable electronic configuration, making it more stable than the phosphorus atom and less likely to react.

In summary, the electron configurations for these atoms and ions show that they all achieve stable configurations by either gaining or losing electrons to attain the electron configuration of a noble gas. This stability makes the ions less reactive compared to their respective atoms. The noble gas configuration with a full valence shell of 8 electrons provides increased stability and reduces the tendency of these species to participate in chemical reactions.

To learn more about electron configuration click here:

brainly.com/question/29157546

#SPJ11

Which of the following is not a chemical property?

Answers

Density is not a chemical property. It is a physical property.Electromotive force, Flammability and pH are chemical properties.

Which statement best describes a physical change?
O Changes can occur to certain chemical properties of the substance, but the overall shape of the substance will
remain the same.
O Changes can occur to certain physical properties of the substance, but the overall shape of the substance will
remain the same.
O Changes can occur to physical properties of a substance, but the chemical composition of the substance remains
the same.
O Changes can occur to chemical properties of a substance, but the chemical composition of the substance remains
the same.

Answers

The answer is the third one .

True or false: according to the law of conservation of mass, matter cannot be created nor destroyed in an isolated system.

Answers

Answer: true

Explanation:

Answer: true

Explanation:

Buddhism was first brought to China via the

Answers

Answer:

The Silk Road

Explanation:

Buddhism entered CHINA via the Silk Road beginning in the 1st and 2nd centuries they had.

Give three chemical properties of gasoline.

Answers

Here are some examples of chemical properties:
Reactivity with other chemicals.
Toxicity.
Coordination number.
Flammability.
Enthalpy of formation.
Heat of combustion.
Oxidation states.
Chemical stability. HOPE THIS HELPS!

he equilibrium constant is a ratio of the concentration of the products to the concentration of the reactants.select one:truefalse

Answers

The statement "The equilibrium constant is a ratio of the concentration of the products to the concentration of the reactants" is true. The equilibrium constant is the concentration ratio of the products and the reactants when a reaction has reached equilibrium.

The concentration ratio of the products and the reactants at equilibrium is always constant. The equilibrium constant is represented as Kc or Kp. Here, Kc stands for concentration equilibrium constant and Kp represents the partial pressure of equilibrium constant.The equilibrium constant is calculated using the molar concentration of the products and the reactants in a chemical reaction. The value of Kc remains the same as long as the temperature of the reaction is constant.The equilibrium constant value varies from one reaction to another.
The equilibrium constant value is an indication of the strength of the bonds of the reactants and products. The higher the value of the equilibrium constant, the more favored the forward reaction. A lower value of Kc indicates that the reverse reaction is favored. The value of Kc is used to determine the position of the equilibrium of a reversible reaction.

Thus, we can conclude that the statement "The equilibrium constant is a ratio of the concentration of the products to the concentration of the reactants" is true.

to know more about equilibrium constant visit:

brainly.com/question/28559466

#SPJ11

Which would increase the rate of dissolving salt into water? Will give Brainliest!!!
A Low temperature

B Little to no agitation

C More surface area

D Darker colors

Answers

Answer:

A) Low temperature

Explanation:

its right on edge

Answer:

A is da answer

Explanation:

i did unit test on ed 2021

What is an ion? What are the two ways in which an ion can be made?

Answers

Answer: Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the ...

When an asteroid hit the Earth 65 million years ago, it threw a huge amount of dust into the atmosphere. This dust cloud stayed in the sky, blocking out the Sun for at least 10 years. Why did most of the animals on the Earth go extinct at this time?
(Hint: Not B)

A. The dust cloud prevented plants from making food

B. The asteroid started fires that burned the Earth

C. The Sun turned off

Answers

The aquarium has 1 fewer red fish than blue fish. 60 percent of the fish are blue. How many blue fish are in the aquarium? Show a all your work and explanation.


Please help

When using a clamp and ring stand to hold glassware and tools, what is the best position for the clamp? Select one: As high as possible on the ring stand Directly above the base of the ring stand O As low as possible on the ring stand O Exactly opposite the base of the ring stand

Answers

The best position for the clamp when using a clamp and ring stand is as high as possible on the ring stand.

When setting up glassware and tools using a clamp and ring stand, it is important to position the clamp at the highest possible point on the ring stand. This ensures stability and reduces the risk of accidents or breakage.

By positioning the clamp as high as possible on the ring stand, the weight of the glassware or tools is evenly distributed and centered, providing better balance and stability. This minimizes the chance of the apparatus tipping over or falling off the stand, which can result in damage to the equipment or potential injury.

Additionally, placing the clamp higher up on the ring stand allows for better visibility and accessibility to the experimental setup. It provides a clear line of sight and more space underneath the apparatus, making it easier to manipulate and observe the experiment or perform other necessary tasks.

Overall, positioning the clamp as high as possible on the ring stand is the best practice for ensuring stability, safety, and convenience when using glassware and tools in a laboratory setting.

To learn more about clamp click here: brainly.com/question/32412029

#SPJ11

A solution is prepared by dissolving 91.7 g fructose in 545 g of water. Determine the mole fraction of fructose if the final volume of the solution is 576 mL.
A) 9.83 × 10-1
B) 1.65 × 10-2
C) 1.44 × 10-1
D) 1.32 × 10-2
E) 8.84 × 10-2

Answers

The mole fraction of fructose in the solution is 1.32 × 10^-2 (option D). To calculate the mole fraction of fructose, we need to determine the number of moles of fructose and the number of moles of water in the solution.


We can use the formula for mole fraction to find the desired value.

First, let's calculate the number of moles of fructose:

Molar mass of fructose (C6H12O6) = 180.16 g/mol

Number of moles of fructose = mass of fructose / molar mass of fructose

Number of moles of fructose = 91.7 g / 180.16 g/mol

Next, let's calculate the number of moles of water:

Molar mass of water (H2O) = 18.02 g/mol

Number of moles of water = mass of water / molar mass of water

Number of moles of water = 545 g / 18.02 g/mol

Now, we can calculate the mole fraction of fructose:

Mole fraction of fructose = moles of fructose / (moles of fructose + moles of water)

Mole fraction of fructose = moles of fructose / total moles of solute

Substituting the values into the formula, we get:

Mole fraction of fructose = (91.7 g / 180.16 g/mol) / [(91.7 g / 180.16 g/mol) + (545 g / 18.02 g/mol)]

Evaluating this expression, we find that the mole fraction of fructose is approximately 1.32 × 10^-2, which corresponds to option D.

To learn more about mole fraction click here: brainly.com/question/30724931

#SPJ11

.. Today, India continues to move north into Eurasia at a speed of
2 cm/year. How far will India have moved in 1 000 000 years? (Hint:
Use the equation d = vt).

Answers

Answer:

2,000,000 cm :)

Explanation:

Alright, India moves 2 cm/year.

There are 1,000,000 years.

Soooo, it will move 1,000,000 * 2 = 2,000,000 cm into Eurasia a year!

answers introduction to organic chemistry: hydrocarbons why? organic molecules all contain carbon. this pogil explores an introduction to the most basic organic molecules, hydrocarbons, their structure, and how to name them. these skills are necessary to decoding ingredient labels and more complex organic compounds.

Answers

Organic chemistry is a branch of chemistry that deals with carbon compounds and hydrocarbons are a class of organic compounds that consist of carbon and hydrogen.

Organic molecules contain carbon, which is the basis of the discipline. Organic chemistry is important because it can be used to synthesize new drugs, materials, and chemicals. Organic molecules are found in a variety of substances, including living organisms, fossil fuels, and plastics.

Hydrocarbons are a class of organic compounds that consist of carbon and hydrogen. They are the most basic organic molecules and are found in many substances, including natural gas, petroleum, and coal. Hydrocarbons can be classified into three groups: alkanes, alkenes, and alkynes.

Alkanes are saturated hydrocarbons that contain only single bonds between carbon atoms. They are named using the prefix "alkane" and a suffix that indicates the number of carbon atoms in the molecule. For example, methane (CH4) is a one-carbon alkane. Alkenes are unsaturated hydrocarbons that contain at least one carbon-carbon double bond. They are named using the prefix "alkene" and a suffix that indicates the number of carbon atoms in the molecule. For example, ethene (C2H4) is a two-carbon alkene. Alkynes are unsaturated hydrocarbons that contain at least one carbon-carbon triple bond. They are named using the prefix "alkyne" and a suffix that indicates the number of carbon atoms in the molecule. For example, ethyne (C2H2) is a two-carbon alkyne.

The ability to name hydrocarbons is important because it allows chemists to communicate with each other about the structures of organic molecules. It also allows consumers to understand the ingredients in the products they use.

Thus, organic chemistry is a branch of chemistry that deals with carbon compounds and hydrocarbons are a class of organic compounds that consist of carbon and hydrogen.

To learn more about hydrocarbons :

https://brainly.com/question/5495325

#SPJ11

Other Questions
For questions 1-3, find the surface area1.8-10-2. Karen Ahmed, a recent graduate of an accounting program, evaluated the operating performance of Lone Company's our divoom Kamen presentation to the Lunar board of directors and suggested the Roa Division be eleminated the Re Dion in the sta by $20,000 The Other Four Riffa Divisions Division Sales $1,600,000 $110,000 Cost of goods sold 950,000 80,000 Gross profit 650,000 30,000 Operating expenses 500,000 50,000 Net income $150,000 ($20,000) In the Riffa Division, cost of goods sold is $65,000 variable and $15,000 fixed, and operating expenses are $40,000 variable and $10,000 foxed None of the Fa Division's fixed costs will be eliminated if the division is discontinued Required: (1) Prepare an incremental analysis to eliminate or keep a division decision (6.5 marks) (2) Is Karim Ahmed right about eliminating the Riffa Division? Why or why not? (1.5 marks) Which of the following is not one of the benefits of a strong team bond?A. EncouragementB. Criticism C. SympathyD. Support Find the equation of the line that contains the point P(2, 5) and is parallel to the graph of 3x + y = 4. Zelecyica Hotel owns more than 20 hotels throughout the Japan. They recently acquired a small hotel chain headquartered in France. Zelecyicas chief executive decided that half of the new hotels in France would be retained and rebranded as part of the Zeleccyica Hotels Group; the other half will be sold. This will support Zelecyicas strategic objective of growing the organisation slowly to make sure that new ventures are well supported and opened on time and on budget. Zelecyicas hotels are considered budget accommodations; they are functional, clean and reasonably priced. Most guests stay for one to three nights and are a combination of business and leisure travelers. The hotels are typically situated in downtown locations that are easily accessible by mass transit. Tourists are attracted to these hotels in popular visitor destinations where the many local attractions mean that they will not be spending much time in their hotel rooms. The organisation has decided to use an ethnocentric approach and send some of their existing Japan-based managers to France to lead the changeover of the new hotels and then manage them after they re-open. If this new overseas venture is successful, Zelecyica may decide to acquire other small hotel groups in other European countries. The organisation would like to own 50 hotels in the next five years. Their 10-year plan is to own 100 hotels across Europe. This is an ambitious target, so it is important that the organization finds an effective formula to operate successfully in other countries.The hotel management asked you if they should look only at internal candidates who are parent country nationals (PCNs) or recruit host country nationals (HCNs) to support the hotels growth to France. Advice the hotel management accordingly. (40 marks)CLO 1: Explain the strategic context of IHRM 1a. Prior to imposing of an excise tax on gasoline, a given family bought 500 gallons of gasoline peryear. With an excise tax (equivalent to an increase in price) of $ 0.75 per gallon, the family buys400 gallons of gasoline per year. In effect, the family is taxed $300 year. "If the excise taxremains in place, but the family is given a lump-sum of $300 (in cash), the familysconsumption of gasoline will remain at 500 gallons a year." Do you agree or disagree?Explain1b.When the price of gasoline is $3.50 per gallon, Michael consumes 1,000 gallons per year. An excise taxof $0.50 per gallon causes the price to rise to $4.00 per gallon, and Michaels consumption of gasolinefalls to 800 gallons per year. Now suppose the government eliminates the excise tax and instead chargesMichael a flat sum of $400 per year (a lump-sum tax). In comparison to the excise tax, how will thisaffect Michaels consumption of gasoline and her well-being? What are some good Halloween costume ideas for teen girls? Aaron files as a single taxpayer and does not participate in a qualified retirement plan at work. His modified AGI was $69,600 in Year 1. He contributed $5,000 to his conventional IRA. How much IRA contribution can he deduct in Year 1?For this question only, use the following IRA phase-out range to calculate any IRA deduction:Single: b/t $62k and $72k.MFJ: b/t $99k and $119k. The proprietary theory, the entity theory, and the funds theory,are three approaches to accounting for equities.Describe briefly each of these theories and include a BiblicalPerspective "Discuss the advantages and disadvantages of the surfaceweb.Discuss the advantages and disadvantages of the deep web.Discuss the advantages and disadvantages of the Dark Web.MIS The Surface Web, the Deep Web, and the Dark Web that is ori the Triternet. Fstimates are that the deep web comprises \( 80-90 \) percent of information on the Internetweb, the Dark Web comprises a" Why did de Mendoza support the Fray Marcos de Niza expedition?a.He wanted new Catholic converts.b.He had heard positive reports from de Vaca.c.He had heard the medieval myth that supported the expedition.d.All of the aboveWhen Coronado's men visited the pueblos, what did they do?a.They traveled to numerous pueblos and gave gifts.b.They traveled to only a few, then gave up.c.They always asked for directions to the gold mines.d.They left priests to remain and convert the Pueblo Indians.As a Spanish soldier, what was Oate's job?a.road builderb.weapons instructor to new soldiersc.city law enforcerd.Native American conquerorWhat warning did Coronado get before the expedition left?a.northern Indians threatened to kill any white man in their territoryb.many Southern Indians were also cool and sour towards the Spaniardsc.Melchior Diaz traveled to verify Fray Marcos de Niza's findings and he couldn't verify goldd.all of the aboveHow did Oate respond to the Natives attack at Acoma?a.The Spanish took all men, women, and children survivors to be tried.b.Oate led an assault on Acoma.c.The Spaniards demanded that the leaders of the revolt be turned over to them.d.Soldiers fired on Acoma and scaled the cliffs.Which of the following was a positive accomplishment of the Coronado expedition?a.It led to the first European contact with the Pueblos.b.It explored from Mexico to Kansas.c.It led to the first Europeans to see the Grand Canyon.d.all of the aboveWhy were Coronado's men disappointed by what they found?a.They found no gold and silver, only gem-studded doors.b.The summer heat drained their energy, and their horses collapsed.c.They found only small pueblos or single houses.d.All of the above.What instructions did the Viceroy give Coronado about the expedition?a.He said he did not want violence.b.He said he wanted a quick and forceful conquest of the Natives.c.He told Coronado to do whatever it took to get gold.d.He told Coronado to be slow and cautious about approaching the Natives.What information led to Coronados expedition?a.A report from Cabeza de Vacac.Reports from Cortsb.Fray Marcos de Niza's reportd.Tales told by EstevanWhat was the result of the attack on Oate's men at Acoma?a.10 men, including Oate's nephew, were killed.b.Everyone escaped and told Oate what happened.c.The men of Acoma were forced to run away.d.Only one Spaniard was killed at Acoma.What equipment did Coronados men have?a.Most men had the clothes on their backs, their goats and sheep.b.Most men had horses, a coat of mail, a buckskin coat, a crossbow, and other weapons.c.Most men had bows and arrows and little else.d.Most men had their wives and children along, so they carried a lot of food.What did the Spaniards "hear" about Fray Marcos de Niza's journey?a.They heard about destroyed towns and villages.b.They heard that the Pueblo people were ready to convert to Catholicism.c.They heard there were no towns with any sort of wealth.d.They heard about abundant gold and civilized people with wool clothes.How did Coronado react after he was disappointed by the villages?a.He sent Fray Marcos de Niza back to New Spain.b.He killed a great many Pueblo Indians .c.He took whatever supplies his soldiers needed.d.He did all of the above. What is the Value of the missing AngleA- 105B- 80C- 55D- 25 What does the expression x 4 mean in word form? A student analyzed the diagram and incorrectly concluded that AB = 2BC. Explain the student's error.EB is the perpendicular bisector of AD,so AB= BD.angle BEC is congruent to angle DEC, soBC= CD.BC + CD = BD = AB, andBC + CD = BC + BC = 2BC,so AB= 2BC What will be the wavelength of a photon that is emitted when an electron of a hydrogen atom undergoes a transition from n=7 to n=4?RH=2.1791018Jh=6.6261034Jsc=2.998108ms the nurse is making a home visit and observes the 7-month-old pulling the family dog's hair and ears. which parenting skill does the nurse determine is most effective? what is financial accounting with example Plz answer me will mark as brainliest Allison read 9 books in 3 months. If reads at a constant rate,how many books did she read each month? GIVE YOUR ANSWER AS A WHOLE NUMBER OR A FRACTION IN THE SIMPLEST FORM!Please help please Im so bad at math The Family Educational Rights and Privacy Act (FERPA) protects students rights to keep their academic records private. What duties are imposed and upon whom because of this protection of rights? Discuss the relationship between rights and duties.