Answer:
ok i see it
Explanation:
Answer: the planets, gravity, the galaxies
Explanation:
Write anything you want about it .
For example, there are 8 planets and their names
50 POINTS!!!
Calculate the Pressure in atmospheres of 0.5 mol of helium (He) at 20 degrees celcius and occupying 2.50 L. Show all work.
Answer:
Pressure = 4.81atm
Explanation:
Pressure = ?
Temperature = 20°C = (20 + 273.15)K = 293.15K
Volume = 2.50L
R = 0.082J/mol.K
n = 0.5mol
From ideal gas equation,
PV = nRT
P = pressure of the ideal gas
V = volume the gas occupies
n = number of moles of the gas
R = ideal gas constant and may varies due to unit of pressure and volume
T = temperature of the ideal gas
PV = nRT
Solve for P,
P = nRT/ V
P = (0.5 * 0.082 * 293.15) / 2.50
P = 12.01915 / 2.50
P = 4.807atm
P = 4.81atm
The pressure of the ideal gas is 4.81atm
PLEASE ANSWER ASAP- 2 MIN LEFT
A pH of 7 indicates that a solution is ___________ ; a ph <7 would mean the solution is ____________________; and a pH >7 is a(n) ---------- solution.
Answer:
neutral, acidic, basic
Explanation:
Know the acidity rules. Sorry I just saw this!
- Hope that helps! Please let me know if you need further explanation.
CHEM HELP PLS 30 POINTS!!
1. what volume of 0.20 M HCl (aq) is needed to titrate 50 mL of 0.10 M NaOH to the endpoint?
A) 10.0 mL HCl
B) 40.0 mL HCl
C) 25.0 mL HCl
D) 20.0 mL HCl
2. what is the molarity of a NaOH solution if 40 mL of the solution is titrated to the endpoint with 15 mL of 1.50 M H2SO4?
A) 1.13 M
B) 1.47 M
C) 0.56 M
D) 0.75 M
3. suppose that 10.0 mL of HNO3 is neutralized by 71.4 mL of a 4.2 x 10 ^ -3 M solution of KOH in a titration. Calculate the concentration of the HNO3 solution.
A) 1.0 x 10 ^ -2 M
B) 3.0 x 10 ^ -2 M
C) 5.5 x 10 ^ -2 M
D) 1.0 x 10 ^ -14 M
Balanced equation
HCl + NaOH —> NaCl + H₂O
From the balanced equation above,
The mole ratio of the acid, HCl (nA) = 1The mole ratio of the base, NaOH (nB) = 1From the question given above, the following data were obtained:
Volume of base, NaOH (Vb) = 50 mLConcentration of base, NaOH (Cb) = 0.1 MConcentration of acid, HCl (Ca) = 0.2Volume of acid, HCl (Va) =?CaVa / CbVb = nA / nB
(0.2 × Va) / (0.1 × 50) = 1
(0.2 × Va / 5 = 1
Cross multiply
0.2 × Va = 5
Divide both side by 0.2
Va = 5 / 0.2
Va = 25 mL (Option C)
2. How to determine the molarity of NaOHBalanced equation
H₂SO₄+ 2NaOH —> Na₂SO₄ + 2H₂O
From the balanced equation above,
The mole ratio of the acid, H₂SO₄ (nA) = 1The mole ratio of the base, NaOH (nB) = 2From the question given above, the following data were obtained:
Volume of base, NaOH (Vb) = 40 mLConcentration of acid, H₂SO₄ (Ca) = 1.5 MVolume of acid, H₂SO₄ (Va) = 15 mL Concentration of base, NaOH (Cb) =?CaVa / CbVb = nA / nB
(1.5 × 15) / (Cb × 40) = 1 / 2
22.5 / (Cb × 40) = 1 / 2
Cross multiply
Cb × 40 = 22.5 × 2
Divide both side by 40
Cb = (22.5 × 2) / 40
Cb = 1.13 M (Option A)
3. How to determine the molarity of HNO₃Balanced equation
HNO₃ + KOH —> KNO₃ + H₂O
From the balanced equation above,
The mole ratio of the acid, HNO₃ (nA) = 1The mole ratio of the base, KOH (nB) = 1From the question given above, the following data were obtained:
Volume of base, KOH (Vb) = 71.4 mLConcentration of base, KOH (Cb) = 4.2×10¯³ MVolume of acid, HNO₃ (Va) = 10 mL Concentration of acid, HNO₃ (Ca) =?CaVa / CbVb = nA / nB
(Ca × 10) / (4.2×10¯³ × 71.4) = 1
(Ca × 10) / 0.29988 = 1
Cross multiply
Ca × 10 = 0.29988
Divide both side by 10
Ca = 0.29988 / 10
Ca = 3×10¯² M (Option B)
Learn more about titration:
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If 7.0 mol sample of a gas has a volume of 12.2 L, what would the volume be if the amount of gas was increased to 16.8 mol
Answer:
[tex]V_{2} = 29.28\,L[/tex]
Explanation:
Let assume that gas behaves ideally and experiments an isobaric and isothermal processes. The following relationship is applied to determined the final volume:
[tex]\frac{V_{1}}{n_{1}} = \frac{V_{2}}{n_{2}}[/tex]
[tex]V_{2} = V_{1} \cdot \left(\frac{n_{2}}{n_{1}} \right)[/tex]
[tex]V_{2} = (12.2\,L)\cdot \left(\frac{16.8\,moles}{7\,moles} \right)[/tex]
[tex]V_{2} = 29.28\,L[/tex]
Copy the sentences below. Correcting the five mistakes.
In a displacement reaction, a less reactive metal pushes out a more reactive metal from its compound. For example, iron displaces aluminium from aluminium oxide.
Answer:
In a displacement reaction, a more reactive metal pushes out a less reactive metal from its compound. For example, aluminium displaces iron from iron oxide.
Explanation:
Because aluminium is more reactive than iron, it displaces iron from iron(III) oxide. The aluminium removes oxygen from the iron(III) oxide: iron is reduced.
...
Hope this answer can help you. Have a nice day!
In a displacement reaction, a more reactive metal pushes out a less reactive metal from its compound. For example, aluminium displaces iron from iron oxide.
What is a compound?Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
Learn more about compound,here:
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#SPJ2
Give the molecular geometry and number of electron groups for sf4. give the molecular geometry and number of electron groups for . square planar, 6 electron groups square pyramidal, 6 electron groups t-shaped, 5 electron groups octahedral, 6 electron groups seesaw, 5 electron groups
Answer:
5 electron groups, see saw
Explanation:
During the formation of SF4, the sulfur atom usually bonds with each of four fluorine atoms where 8 of valence electrons are used. The four fluorine atoms have 3 lone pairs of electrons in its octet which will further utilize 24 valence electrons. In addition, two electrons are present as a lone pair on the sulfur atom. We can determine sulfur’s hybridization state by counting of the number of regions of electron density on sulphur (the central atom in the molecule). When bonding takes place there is a formation of 4 single bonds to sulfur and it has 1 lone pair. Looking at this, we can say that the number of regions of electron density is 5. The hybridization state is sp3d.
SF4 molecular geometry is seesaw with one pair of valence electrons. The molecule is polar. The equatorial fluorine atoms have 102° bond angles instead of the actual 120° angle. The axial fluorine atom angle is 173° instead of the actual 180° bond angle.
What are some true statements about light
Answer:It allows us to see things so we know where we are going that’s why at night we had lamp posts
Explanation:
46g of a mineral contained 16g copper, 14g iron and 16g sulphur. Calculate the empirical
formula of the mineral.
Answer:
CuFeS2
Explanation:
Calculate the moles of each substance by doing moles= mass/relative atomic mass. you should get 0.25 moles of copper and iron and 0.5 moles of sulfur. Then divide all of those numbers by 0.25 (as its the lowest value) you should get 1 for copper and iron and 2 for sulfur. This represents the ratio that they are in within the mineral.
3. How does heat travel by conduction?
Conduction is the movement of heat through a substance by the collision of molecules. At the place where the two object touch, the faster-moving molecules of the warmer object collide with the slower moving molecules of the cooler object.
Answer:
In CONVECTION
Explanation:
Heat energy is carried by the movement of particles of matter. In CONDUCTION, heat is transferred by particles vibrating. In RADIATION, heat is carried directly by electromagnetic waves. When a hot object touches a cool object, heat moves from the hot one to the cool one.
5. Which statement is NOT true?
a. Light travels with or without a medium.
b. Sound must have a medium to travel through.
c. Both light and sound must have a medium to travel through.
d. Light travels faster than sound.
Answer:
A: true.
B: true.
C: false
D: true.
Explanation:
Light is an electromagnetic wave which travels regardless of whether there is medium. sound is a wave disturbance in medium meaning it must have matter. Also light is much faster then sound.
If O2(g) reacts with H2(g) to produce H2O, what is the volume of H2O obtained from 1 L of O2?
Hint: Write a balanced equation first!
Answer:
2L
Explanation:
We'll begin by writing the balanced equation for the reaction this is illustrated below:
2H2 + O2 —> 2H2O
1 mole of a gas occupy 22.4L.
1 mole of O2 occupy 22.4L.
2 moles of H2O occupy = 2 x 22.4 = 44.8L.
From the balanced equation above,
22.4L of O2 produced 44.8L of H2O.
Therefore, 1L of O2 will produce = 44.8/22.4 = 2L.
Therefore, 1L of O2 will produce 2L of H2O.
Fill in the missing piece of the table
Answer: The final volume [tex]V_2[/tex] is 263.09 ml
Explanation:
To calculate the final volume of the system, we use the equation given by Charles' Law. This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.
Mathematically,
[tex]\frac{V_1}{T_1}=\frac{V_2}{T_2}[/tex]
where,
[tex]V_1\text{ and }T_1[/tex] are the initial volume and temperature of the gas.
[tex]V_2\text{ and }T_2[/tex] are the final volume and temperature of the gas.
We are given:
[tex]V_1=156ml\\T_1=215^oC=(215+273)K=488K\\V_2=?\\T_2=550^0C=(550+273)K=823K[/tex]
Putting values in above equation, we get:
[tex]\frac{156}{488}=\frac{V_2}{823}\\\\V_2=263.09ml[/tex]
Thus final volume [tex]V_2[/tex] is 263.09 ml
Which of the following is stored in the skeletal system?
A. potassium
B. calcium
phosphorous
D. sodium
Answer:
b calcium
Explanation:
What is the formula of a potassium ion?
the answer is in the picture!
Can someone answer these questions for me please?
15. Use bond energies to determine the ∆H for the combustion of methane (CH₄).
16. Use Hess's law to determine the ∆H for the combustion of liquid methanol (CH₃OH).
17. Using your answers from question 16, how much energy will you get from burning 245.0 g of methanol in excess oxygen?
18. The ∆S is 209.6 J/K for the following reaction:
C₂H₄ (g) + 3O₂ (g) → 2CO₂ (g) + 2H₂O (g)
• What is the absolute entropy of O₂ (g)?
19. What is ∆G for the following reaction at 298 K?
2C₆H₆ (l) + 150₂ (g) → 12CO₂ (g) + 6H₂O (g)
20. If a reaction has a ∆H of -120.0 kj/mole and is spontaneous for all temperatures less than 200.0 K, what is ∆S?
Answer:
wowits too long
Explanation:
Particles of the substance have the most kinetic energy when the substance is(a)_______. The part of the graph that represents where the substance has the least amount of potential energy is labeled(b)_______.
multiple choice answers available.
(a)
1. A gas
2. A solid
3. Melting
4. vaporizing
(b)
1. Solid
2. Vaporizing
3. melting
4.liquid
5.gas
Answer: 1- gas 2- solid
Explanation:
mention two instruments that could be used to transfer sodium hydroxide solution into conical flask
Answer:
Pipette and Burettes
Explanation:
The two instruments that can be used for
a) Pipette – It is used to dispense measured volume of any liquid into any other equipment. Pipette works on the concept of creating a partial vacuum to take in the liquid and then release the volume to dispense the liquid.
b) Burettes – It has a stopcock that regulate the release of liquid. It is larger than the pipette and works as a graduated cylinder.
In the following reaction 6.13g of water (H2O) is produced the theoretical
yield of water (H2O) is 8.17g, what is the percent yield of water? *
C3H8+5 02 3 CO2 + 4 H2O
A) 85.0%
B) 72.0%
C) 75.0%
D) 67.0%
Answer:
C = 75%
Explanation:
Theoretical yield = 8.17g
Actual yield = 6.13g
To calculate the percentage yield of a compound in a reaction, we'll use the formula to calculate it
Percentage yield = (actual yield / theoretical yield) * 100
% yield = (6.13/8.17) * 100
Percentage yield = 0.7503 * 100
Percentage yield = 75.03%
1. Calculate the molarity of 35g of calcium chloride (CaCl2) that is dissolved in 850ml of water. (Calculate moles first)
a. 0.27M
b. 0.38M
c. 0.32M
d. 0.80M
2. Calculate the molarity of 90g of copper sulfate (CuSO4) when dissolved in 5 L of water.
a. 0.112M
b. 2.8M
c. 0.56M
d. 0.50M
3. What is the molarity of NaOH if 0.70 moles are dissolved in 250 ml of water?
a. 175,000M
b. 2.8M
c. 0.175M
d. 4M
4. How many moles of Lithium oxide (Li20) are in 2 L of solution with a molarity of 2.0M?
a. 1 mole
b. 2 moles
c. 0.2 moles
d. 4 moles
5. How many moles of NaCl are in 7.5 L of 0.5M?
a. 3.75 moles
b. 15 moles
c. 0.066 moles
d. 2.5 moles
Answer:
yo I got same question do u know it
ILL GIVE YOU BRAINLIST * have to get it right * !!! Although individual body systems can perform specific functions, they depend on one another and work together for the good of the entire organism.
Which of the following provides the best evidence that the digestive system and the muscular system work together to carry out their functions?
DNA is a nucleic acid made of building blocks called nucleotides.
Which of the following options make up nucleotides?
Answer:
Nucleotides are made up of a five carbon sugar such as ribose or deoxyribose and a group of phosphate with 1-3 phosphates
Answer:i don’t see any answer choices but i guess the nucleotides are A, T, C, and G?
Explanation:
Ms. Clark is teaching her class about how plants make food for themselves. On the board, she has written this: __________ + air + water = food for plants
Answer:
sunlight
Explanation:
What is the mass of 3.00 moles of carbon
Answer:
36 grams as 1 mole is 12 grams
Answer:
tbh idk cause I will love to answer your question but ehh
Have scientists found any reliable predictors for earthquakes, like radon gas release or weird animal behavior?
Answer:
The "Parkfield earthquake prediction experiment" was the most heralded scientific earthquake prediction ever. It was based on an observation that the Parkfield segment of the San Andreas Fault breaks regularly with a moderate earthquake of about M 6 every several decades: 1857, 1881, 1901, 1922, 1934, and 1966.
Explanation:
this is the best I could come up with. luv u.
In Humans, the liquid waste
filtered by the kidneys is stored
in the ......?
A) Stomach
B) Bladder
C) Lungs
D) I'm not sure. I need
more help with this
topic.
Name the following straight-chain Alkanes (picture)
Answer:
I don't know about the rest but A is heptane
which phase does best describe the side of the moon that faces earth???
I WILL MARK BRAINLIEST THIS IS IMPORTANT
Answer:
Goes through cycles
Explanation:
Answer the questions using the drop-down menus.
Which is the independent variable in this experiment?
Which is the dependent variable in this experiment?
Which is a controlled variable in this experiment?
In the experiment to measure the heat absorbed by a material placed in
the Sun, we have;
The independent variable is either the angle of insulation or the type of materialThe dependent variable is the temperature of the materialThe controlled variable is the type of material when the angle of insulation is the independent variable and vice versaWhat differentiates the given experimental variables?The possible experiment is with regards to the factors that influence energy from the Sun
The factors investigated are;
The type of material and the angle of lighting (insulation) affects the absorption of heat
The independent variable is the variable that is the cause of the effect
measured in the experiment.
It is the variable that the researcher has control over or controls and
varies during the experiment to produce the measured effect.
In the above experiment, the independent variable are either ;
The angle of insulation or the type of material respectivelyThe dependent variable is the variable that is under test or that is being measured.
In the above experiment the dependent variable is the temperature of the material which can be measuredThe controlled variable is the variable that remains the same or is held
constant during the experiment and can be used as reference to
compare the dependent variable.
In the experiment, the controlled variable are either;
The type of material when the angle of insulation is the independent variable or vice versaLearn more about independent and dependent variables here:
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Answer:
angle of light
temperature of material
type of material
Explanation:
E d g e 22 !
which substance increases in solubility as the temperature decreases
Answer:
Gas
hope this helped
What mass of chromium would be produced from the reaction of 57.0 g of potassium with 199 g of chromium(II) bromide according to the following reaction? 2 K + CrBr2 2 KBr + Cr
Answer:
Mass of Chromium produced = 37.91 grams
Explanation:
2K + CrBr₂ → 2KBr + Cr
2mole 1 mole 1 mole
mass of Potassium = 57.0 grams
molar mass of Potassium = 39.1 g/mol
no of moles of Potassium = 57.0 / 39.1 = 1.458 moles
mass of CrBr₂= 199 grams
molar mass of CrBr₂ = 211.8 gram/mole
no of moles of CrBr₂ = 199 / 211.8 = 0.939 mole
From chemical equation
1 mole of CrBr₂ = 2 moles of K
∴ 0.939 moles of CrBr₂ = ?
⇒ 0.939 x 2/1 = 1.878 moles of K
1.878 moles of K is needed, but there is 1.458 moles of K. So, Potassium is completed first during the reaction . Hence, Potassium is limiting reagent. and CrBr₂ is excess reagent .
From chemical equation
2 moles of K = 1 mole of Cr
∴ 1.458 moles of K = ?
⇒ 1.458 x 1/ 2 = 0.729 moles of Cr
no of moles of Cr formed = 0.729 moles
molar mass of Cr = 52.0 g/mol
mass of one mole of Cr = 52.0 grams
mass of 0.729 moles of Cr = 52.0 x 0.729 = 37.908 grams
mass of Chromium produced = 37.91 grams
