Answer:
A will float on top of B.
Explanation:
B is more dense. example A is oil and B is water.
1.Which phase of matter will maintain a constant volume, but not a constant shape?
solid
liquid
Gas
plasma
A chemistry student is given 250.0 mL of clear aqueous solution at 42 C. He is told an unknown amount of a certain compound X is dissolved in the solution. The student allows the solution to cool to 25C. At that point, the student sees that a precipitate has formed. He pours off the remaining liquid solution, throws away the precipitate and evaporates the remaining liquid solution under vacuum. More precipitate forms. The student washes, dries, and weighs the additional precipitate. It weighs 8.75 g. Using only the information above, can you calculate the solubility of X at 25C? If yes, calculate it.
Answer:
No
Explanation:
The solubility of a solid in water refers to the amount of that solid that dissolves in water.
It is not possible to calculate the solubility of the solid because the student threw away the first precipitate that formed. We already have the volume of water, but having lost some mass of precipitate, it has become impossible to accurately determine the solubility.
Hence the answer provided above.
What is an example of a poly-gastric organism?
Answer:
cow, sheep, goats, deer, elk
What are the 4 parts of cell theory???? List like
1.
2.
3.
4.
Answer:
1. Cells contain DNA that is passed cell to cell during cell divison.
2. Cells are similiar in chemical composition and reactions that maintin homeostasis.
3. All basic chemical and physiological functions are carried out inside the cell.
4. Cell activity depends on the oragnelles withen the cell.
Hope this helps!
What is emperical formula of 62.4% C 4.19 % H 33.2% O
Answer:
[tex]C_{26}[/tex][tex]H_{21}[/tex][tex]O_{10}[/tex]
Explanation:
We are given the following percentages:
Carbon ------ 62.4%
Hydrogen ------------ 4.19%
Oxygen ---------------- 33.2%
Now, let's take a 100g sample of this compound
since percentages are calculated out of 100, you will notice that the mass of the elements in the sample is the same as their percent composition
So we have:
Carbon -------- 62.4 grams
Hydrogen ----------- 4.19 grams
Oxygen ------------ 33.2 grams
With this information, we can calculate the number of moles of the respective elements in the given compound
Moles of Carbon (mass = 12u):
Given mass / Molar mass = 62.4 / 12 = 5.2 moles
Moles of Hydrogen (mass = 1u):
Given mass / Molar mass = 4.19 / 1 = 4.2 moles (approx)
Moles of oxygen (mass = 16u):
Given mass / Molar mass = 33.2 / 16 = 2 moles
The ratio of moles of the respective elements in our compound:
(Moles of Carbon) : (Moles of Hydrogen) : (Moles of Oxygen)
5.2 : 4.2 : 2
Which can be written as: [tex]C_{5.12} H_{4.2} O_{2}[/tex]
We are almost done but there is one problem, the formulas of compounds we see have whole numbers and not decimals
So, we will multiply all 3 of the numbers by the smallest number possible to get whole number ratios
Since there are 2 numbers we need to take care of and both of them have 2 in the decimal place,
we can multiply by 5 to get whole number ratios
So we get:
26 : 21 : 10
Therefore the molecular formula of the compound:
[tex]C_{26}H_{21}O_{10}[/tex]
Why must chemical equations be balanced?
A:So that the chemical reaction doesn't explode
B:The reaction won't happen until it is balanced
C:Matter cannot be created or destroyed in a chemical reaction
D:None of these
Answer:
to validate the law of conservation of mass as total no. of reactants must be equal to the total no. of products
40.3 degrees Fahrenheit. Each hour the temperature decreases by 2.09 What is the
temperature after 2 hours?
One type of atomic particle that is found in the nucleus does not contribute to
an element's atomic number. What are two characteristics of this type of
atomic particle?
A. Negative charge
B. Almost o amu
C. 1 amu
D. No charge
Answer:
In the middle of every atom is the nucleus. The nucleus contains two types of subatomic particles, protons and neutrons. The protons have a positive electrical charge and the neutrons have no electrical charge. D. No Charge
Explanation:
Answer:
C & D
Explanation:
Just took quiz and got it right! Hope this helps! <3
Is chloroform a polar molecule? How do you know?
Answer:
A polar molecule does not have an even distribution of electrons. ... Therefore Chloroform is a polar molecule because it does not have an even distribution of molecules, and one end is more negatively charged (Cl) than another (H).
Explanation:
A 2.50M solution of NaOH is diluted from a volume of 0.890L to a volume of 2.00L, What is the new molarity?
O 2.78011
O 1.11M
O 5.62M
O 4.5M
Answer:
1.11 M
Explanation:
M₁V₁ = M₂V₂
Step 1: Define
Molarity₁ = 2.50 M
Volume₁ = 0.890 L
Molarity₂ = unknown
Volume₂ = 2.00 L
Step 2: Substitute and Evaluate for M₂
(2.50 M)(0.890 L) = (M₂)(2.00 L)
2.225 = M₂(2.00 L)
M₂ = 1.1125 M
Step 3: Simplify
We are given 3 sig figs.
1.1125 M ≈ 1.11 M
Plants need sunlight to make food during the process of:
Photosynthesis
Respiration
Nuclear fusion
Digestion
the answer is photosynthesis
Question 2
0.83 pts
Given that the specific heat of copper metal is 0.377 J/(g °C), how much heat is required to
increase the temperature of 2.00 g of copper metal by 1.00 °C?
O 1.51 L
O 2.377
O 0.189 J
0.377 J
O 0.754 J
Question 3
0.83 pts
Answer:
Option e is correct
The heat required to increase the temperature of copper metal by 1 degree is 0.754 j .
Explanation:
Given data:
specific heat of copper = 0.377 j/g.°C
Heat required to increase temperature = ?
Mass of copper = 2.00 g
Change in temperature = 1°C
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
Q = m.c. ΔT
Q = 2 g× 0.377 j/g.°C × 1°C
Q = 0.754 j
The heat required to increase the temperature of copper metal by 1 degree is 0.754 j .
FAST PLEASE HELP All atoms of the same element must have the same number of
O protons.
O neutrons.
O compounds.
O electrons.
Answer: A. Protons
Explanation:
An organic compound of relative molecular mass 46,on analysis was found to contain 52.0% carbon, 13.3% hydrogen and 34.7% oxygen
(H=1,C=12,O=16)
calculate the empherical formulae and molecular formulae
Answer:
Empirical formula is C₂H₆O.
Explanation:
Empirical formula:
It is the simplest formula gives the ratio of atoms of different elements in small whole number
Given data:
Percentage of hydrogen = 13.3%
Percentage of carbon = 52.0%
Percentage of oxygen = 34.7%
Empirical formula = ?
Molecular formula = ?
Solution:
Number of gram atoms of H = 13.3 / 1.01 = 13 .17
Number of gram atoms of O = 34.7 / 16 = 2.17
Number of gram atoms of C = 52.0 / 12 = 4.3
Atomic ratio:
C : H : O
4.3/2.17 : 13.17/2.17 : 2.17/2.17
2 : 6 : 1
C : H : O = 2 : 6 : 1
Empirical formula is C₂H₆O.
Molecular formula:
Molecular formula = n (empirical formula)
n = molar mass of compound / empirical formula mass
n = 46 / 158
The relative molecular mass of compound is not correct.
5. A 1.1181-g sample of an alloy (a mixture) of aluminum and magnesium was treated with an
excess of sodium hydroxide solution. In the reaction, only the aluminum reacts with the sodium
hydroxide solution:
2 Al + 2 NaOH + 6 H202 Na[Al(OH)4] + 3 H2
If 0.1068 g of H2 is produced, what is the mass percent of aluminum in the alloy?
Answer : The mass percent of Al in the alloy is 85.9 %.
Explanation : Given,
Mass of sample of an alloy = 1.1181 g
Mass of [tex]H_2[/tex] = 0.1068 g
Molar mass of [tex]H_2[/tex] = 2 g/mol
Molar mass of [tex]Al[/tex] = 27 g/mol
First we have to calculate the moles of [tex]H_2[/tex].
[tex]\text{Moles of }H_2=\frac{\text{Given mass }H_2}{\text{Molar mass }H_2}[/tex]
[tex]\text{Moles of }H_2=\frac{0.1068g}{2g/mol}=0.0534mol[/tex]
Now we have to calculate the moles of [tex]Al[/tex]
The balanced chemical equation is:
[tex]2Al+2NaOH+6H_2O\rightarrow 2Na[Al(OH)_4]+3H_2[/tex]
From the reaction, we conclude that
As, 3 moles of [tex]H_2[/tex] produced from 2 moles of [tex]Al[/tex]
So, 0.0534 mole of [tex]H_2[/tex] produced from [tex]\frac{2}{3}\times 0.0534=0.0356[/tex] mole of [tex]CaCl_2[/tex]
Now we have to calculate the mass of [tex]Al[/tex]
[tex]\text{ Mass of }Al=\text{ Moles of }Al\times \text{ Molar mass of }Al[/tex]
[tex]\text{ Mass of }Al=(0.0356moles)\times (27g/mole)=0.9612g[/tex]
Now we have to calculate the mass percent of Al in the alloy.
Mass percent of Al in alloy = [tex]\frac{\text{Mass of Al}}{\text{Mass of sample of an alloy}}\times 100[/tex]
Mass percent of Al in alloy = [tex]\frac{0.9612g}{1.1181g}\times 100[/tex]
Mass percent of Al in alloy = 85.9%
Therefore, the mass percent of Al in the alloy is 85.9 %.
5A. Particles in a solid are closer/farther apart than they are in a liquid
or gas which are closer/farther apart.
5B. Conduction involves the collision of particles in less/more dense
materials collide less/more often than particles in less/more dense
materials. For example, solids conduct thermal energy faster/slower
than liquids or gases because the particles are closer or farther apart
and collide frequentiylrarely.
Answer:
Wait so what is the answer, before any one says any thing I knw this is Not a question so plz don't say nothing about it.
Explanation:
Particles in a solid are closer than they are in a liquid or gas which are farther apart. Conduction involves the collision of particles in more dense materials.For example, solids conduct thermal energy faster than liquids or gases because the particles are closer and collide frequently.
What is conduction?Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.
In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .
When conduction takes place, heat is usually transferred from one molecule to another as they are in direct contact with each other.There are 2 types of conduction:1) steady state conduction 2) transient conduction.According to the type of energy conduction is of three types:
1) heat conduction
2) electrical conduction
3)sound conduction
Learn more about conduction,here:
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A balloon is filled with a gas and has a volume of 1.79 L at 2.82 atm pressure. What will its volume be if
the pressure is changed to 5.30 atm?
Answer:
The answer is 0.95 LExplanation:
In order to find the volume when the pressure is changed to 5.30 atm we use Boyle's law which is
[tex]P_1V_1 = P_2V_2 \\[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the final volume
[tex]V_2 = \frac{P_1V_1}{P_2} \\ [/tex]
From the question
P1 = 2.82 atm
V1 = 1.79 L
P2 = 5.30 atm
So we have
[tex]V_2 = \frac{2.82 \times 1.79}{5.3} \\ = 0.9524150943...[/tex]
We have the final answer as
0.95 LHope this helps you
Match each term with its definition or description.
________ moles of solute per liter of solution
________moles of solute per kilogram of solvent
________mass of a substance per unit volume
________mass of a solute per mass of the total solution, multiplied by 100
________volume of a solute per volume of the total solution, multiplied by 100
a. molarity
b. weight percent
c. parts per billion
d. weight concentration
e. molality
f. Parts per billion
g. volume percent density
Answer:
a. molarity
e. molality
h. density
b. weight percent
g. volume percent
Explanation:
Molarity is defined as the number of moles of substance dissolved in per liter of solution (moles/Liter). It is also called molar concentration of the solution.
Molality is defined as the number of moles of substance dissolved in one kg or kilogram of solvent and its SI unit is mol/kg.
Density is defined as the mass divided by its volume.
density =mass/volume
Weight percent is defined as the division of mass of a solute to the mass of the total solution, multiplied by 100. To calculate the weight percent or mass percent, both mass of a solute and the mass of a solution is required to express the concentration of a solution.
Volume percent is defined as the ratio of the volume of the solute to the volume of the total solution multiplied by 100.
What conclusion about bonding can be drawn from these diagrams?
A) In ionic bonding the valence electrons are combined while the valence electrons are electrostatically portioned during non-polar covalent bonding.
B) The valence electrons are shared between both atoms in covalent bonding while the valence electrons are completely transferred in ionic bonding.
C) Valence electrons reside in a sea of electrons in metallic bonding while valence electrons are permanently exchanged during crystalline bonding.
D) During amorphous bonding the valence electrons are unevenly shared between the atoms while the valence electrons are borrowed in polar covalent bonding.
Answer:
It’s b
Explanation:
I just did it on usatestprep
The valence electrons are shared between both atoms in covalent bonding while the valence electrons are completely transferred in ionic bonding. Hence, option B is correct.
What is a bond?A chemical bond is what holds atoms together in molecules.
A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms.
These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding.
In the given diagram covalent bond is taking place.
Hence, option B is correct.
Learn more about the bond here:
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The structures of TeF4 and TeCl4 in the gas phase have been studied by electron diffraction (S. A. Shlykov, N. I. Giricheva, A. V. Titov, M. Szwak, D. Lentz, G. V. Girichev, Dalton Trans., 2010, 39, 3245).
a. Would you expect the Te i X (axial) distances in these molecules to be longer or shorter than than Te i X (equatorial) distances? Explain briefly.
b. Which compound would you predict to have the smaller X(axial) i Te i X(axial) angles? The smaller X(equatorial) i Te i X(equatorial) angles? Explain briefly.
Answer:
See explanation
Explanation:
Two structures are pictured in the image attached, structure 2 is a more stable structure for TeF₄ or TeCl₄ since the lone pair in the structure is present at an equatorial position. Note that the structure of the compound is based on a trigonal bipyramid but of the structure type AX4E, where the lone pair could be positioned at axial or equatorial positions as shown in the images attached.
As a result of repulsion between electron pairs, the bond distance between Te - X(axial) is greater than Te-X (equatorial). This implies that the Te - X(axial) bonds are longer than Te - X(equatorial) bonds.
In answering the question, we must take cognisance of the fact fluorine is more electronegative than chlorine. This implies that fluorine will draw more electron density towards itself than chlorine and this shortens the bond length.
The structures of the both compounds are based on a trigonal bipyramid with a bond angle of 90° for axial position and 120° for the equatorial position.
Owing to the greater electo negativity of fluorine, both the fluorine F-axial and F-equatorial bonds of TeF4 are shorter than the Cl-axial and Cl-equatorial bonds of TeCl4. Hence the axial and equatorial angles in TeF4 are smaller than the axial and equatorial bond angles in TeCl4 due to the greater electro negativity of the fluorine atom.
it is a way of thinking about the world, and is made up of a person's views and belief
Incomplete question. I inferred you want the term that fits this definition.
Answer:
A Worldview
Explanation:
Having a Worldview refers to an individual's perception or the way one thinks about the world, influenced by their attitudes and values.
This view of the world is made up of a person's views and beliefs which form their expectations about the world in which they live.
The pale yellow liquid bromine pentafluoride reacts violently with water to give a mixture of bromic acid and hydrofluoric acid .
(a) Write a balanced chemical equation for this reaction.
BrF5 + 3H2O HBrO3 + 5HF
(b) Determine the concentration (in moles per liter) of each of the acids that result from the complete reaction of 5.40×10-2 moles of bromine pentafluoride with enough water to give a solution volume of 783 mL.
bromic acid : ________M
hydrofluoric acid : ___________M
Answer:
The concentration of bromic acid (HBrO₃) is 0.069 moles/L
the concentration of hydrofluoric acid (HF) is 0.345 moles/L
Explanation:
(a) The balanced chemical equation for the reaction is
BrF₅ + 3H₂O → HBrO₃ + 5HF
The chemical equation is balanced
(b) To determine the concentration of each acids,
First, we will determine the different volume of the acids yielded
The solution volume is 783 mL = 0.783 L
From the balanced chemical equation,
1 mole of BrF₅ produces 1 mole of HBrO₃
Likewise, 1 mole of BrF₅ will produce 5 moles of HF
From the question,
5.40×10⁻² moles of bromine pentafluoride (BrF₅) reacted;
Hence, 5.40×10⁻² moles of HBrO₃ will be produced
and 5 × 5.40×10⁻² moles of HF will be produced.
Number of moles of HBrO₃ produced = 5.40×10⁻² moles
and Number of moles of HF produced = 2.7 × 10⁻¹ moles
From the formula,
Number of moles (n) = Concentration (C) × Volume (V)
Then,
Concentration (C) = Number of moles (n) / Volume (V)
For bromic acid (HBrO₃)
n = 5.40×10⁻² moles
Volume = 0.783L
Hence,
C = 5.40×10⁻² moles / 0.783L
C = 0.069 moles/L
This is the concentration of bromic acid (HBrO₃)
For hydrofluoric acid (HF)
n = 2.7 × 10⁻¹ moles
V = 0.783L
Hence,
C = 2.7 × 10⁻¹ moles / 0.783L
C = 0.345 moles/L
This is the concentration of hydrofluoric acid (HF)
What is the mass of a liquid with a density of 2.12 g/mL and a volume of
53.0 mL ?
Answer:
The answer is 112.36 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume of liquid = 53 mL
density = 2.12 g/mL
We have
mass = 2.12 × 53
We have the final answer as
112.36 gHope this helps you
Given that the frequency of a wave is 9.12x10^-12 Hz, what must be the
wavelength? KEEP THREE SIGNIFICANT FIGURES
Answer:
The wavelength of wave is 0.33 ×10²⁰ m.
Explanation:
Given data:
Frequency of wave = 9.12×10⁻¹² Hz
Wavelength of wave = ?
Solution:
Formula:
Speed of light = wavelength × frequency
c = λ × f
λ = c/f
This formula shows that both are inversely related to each other.
The speed of light is 3×10⁸ m/s
Frequency is taken in Hz.
It is the number of oscillations, wave of light make in one second.
Wavelength is designated as "λ" and it is the measured in meter. It is the distance between the two crust of two trough.
Now we will put the values in formula.
λ = 3×10⁸ m/s / 9.12×10⁻¹² Hz
Hz = s⁻¹
λ = 0.33 ×10²⁰ m
The wavelength of radiation is 0.33 ×10²⁰ m .
What is the mass of an object that has a density of 0.500 g/cm3 and a volume of 5.00 mL?
Answer:
The answer is 2.5 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
density = 0.5 g/cm³
1 mL = 1 cm³
5 mL = 5 cm³
volume = 5 cm³
The mass is
mass = 0.5 × 5
We have the final answer as
2.5 gHope this helps you
All of the following are evidence of a chemical change except
Change of matter
Formation of gas
Color change
Precipitate forms
Answer:
The right answer is A, "Change of matter."
Explanation:
The formation of gas, color change, and precipitate forming are the 3 main chemical changes that are evidence of a new substance being produced. A change of matter is not. Changes of state are physical changes in matter. They are reversible changes that do not involve changes in matter's chemical makeup or chemical properties.
What is chromatography paper?
Answer:
paper chromatography is an analytical method used to separate colored chemicals or substances.It is primarily used as a teaching tool,having been replaced by other Chromatography methods ,such as thin layer chromatography.
What is the mass number of the atom shown?
Answer:
21
Explanation:
Formula;
Mass number = number of protons + number of neutrons
= 9 + 12
= 21
You have an Iron atom with atomic mass 58 amu, how many neutrons
does it have?
Answer:
It has 32 neutrons
Explanation:
transport moves substances from an area of low concentration to an area of high concentration.
Answer:
Active Transport
Explanation:
In cellular biology, active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration—against the concentration gradient. Active transport requires cellular energy to achieve this movement. During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.
Answer:
active
Explanation:
i got it right
