CHEMISTRY SOL 4 REVIEW

UNIT 9 – Molar Conversions

Calculate the following:0.35 mol F = _________ atoms F3.25 moles CO2 = ________molecules

2.6 moles Cu = _______ g Cu4.23 g NaCl = ________ moles NaCl

2.11 x 1023

1.96 x 1024

165.23

0.07

2009 SOL question

The number of molecules in 48.0 g of oxygen gas (O2) is –

A 6.02 x 1023

B 9.03 x 1023

C 1.20 x 1024

D 1.81 x 1024

UNIT 9 – Molar Conversions

At STP, 1 mole of any gas occupies ______ Liters

22.4What is the volume of 7.3 g of CO2 at STP?

3.72 LFind the density of O2 gas at STP.1.43 g/L

2009 SOL question

What is the volume occupied by 51 g of NH3 gas at STP?

F 0.439 LG 22.8 LH 67.2 LJ 91.9 L

UNIT 10 - Stoichiometry

What is the mole ratio of Al:Br in the following equation?

2Al (s) + 3Br2 (l) 2AlBr3 (s) 2:3How many moles of O2 are produced when 2.35 moles of CO2 break down?

CO2 C + O2

2.35 moles

UNIT 10 - Stoichiometry

LiOH + HBr LiBr + H2OIf you start with 10 grams of lithium hydroxide, how many grams of lithium bromide will be produced?

36.25 g2SO2 + O2 2SO3

What is the limiting reactant if you have 0.25 moles of each reactant?

SO2

2009 SOL question

If a student starts with 21.7 g of NH3, how many grams of hydrogen (H2) gas will be produced by the reaction?

2NH3 N2 + 3H2

3.85 g

UNIT 10 - Stoichiometry

LiOH + KCl LiCl + KOHI began this reaction with 20 grams of LiOH and produced 31 g of LiCl. What is my percent yield?

Theoretical = 35.4 gPercent Yield = 87.6%

UNIT 11 – Gas Laws

Increasing the number of particles will ____________ the pressure of a gas.

 IncreaseIncreasing volume will ________ the

pressure of a gas. DecreaseDecreasing the temperature will

_______________ the pressure of a gasDecrease

UNIT 11 – Gas Laws

Draw a graph to show the relationship of volume and pressure.

UNIT 11 – Gas Laws

What’s the partial pressure of oxygen in a balloon filled with O2 and N2 if the total pressure in the balloon is 810 mmHg and the partial pressure of N2 is 610 mmHg?

200 mmHg

UNIT 11 – Gas Laws

When using any of the gas laws, what unit must you use for TEMPERATURE?

 KelvinIf we took 2.00 liters of a gas at 1.00

atm and compressed it to a pressure of 6.00 x 104 atm, what would the new volume of that gas be?

P1V1 = P2V23.33 x 10-5 L

UNIT 11 – Gas Laws

If a balloon initially has a volume of 0.4 liters and a temperature of 20oC, what will the volume be after it is heated to a temperature of 250oC?

V1/T1 = V2/T20.71 L

UNIT 11 – Gas Laws

If I have an unknown quantity of gas at a pressure of 1.2 atm, a volume of 31 liters, and a temperature of 87oC, how many moles of gas do I have?

PV = nRT R = 0.0821n = 1.26 moles

UNIT 12 - Solutions

What units do we use when measuring molarity (M)?

 moles/LHow many moles of HCl are needed to make 675 mL of a 2.0 M solution?

1.35 moles

UNIT 12 - Solutions

In terms of solubility, polar substances tend to dissolve in _______________ substances.

 Other polarWhy won’t oil and water stay mixed? Oil is nonpolar, water is polar List two ways you can speed the

dissolving process. Stirring, Heating 

UNIT 12 - Solutions

Which salt is most soluble at 10oC?

 KIHow many grams of KCl can be dissolved in 200 g of water at 80oC?

100 g KCl

UNIT 12 - Solutions

Adding salt to ice or water alters it by _____________ the freezing point.

Lowering/depressing2.0 L of a 0.88 M solution is diluted to 3.8 L. What is the new molarity?

M1V1 = M2V20.46 M

UNIT 13 – Everything Else

How is molar heat capacity different from specific heat capacity?

 Molar heat capacity talks about raising the temp of 1 mole, specific heat is 1 gram

How many joules of heat are given off when 120 grams of water are cooled from 25oC to 10oC? The heat capacity of ice is 2.09 J/goC.

Q = mc TQ = 3762 J

UNIT 13 – Everything Else

What kind of chemical would you use to neutralize an acid spill in a lab?

 Base (Ammonia, Sodium bicarbonate)

What is the pH of a 0.1 M solution of a strong acid?

 1What is the pH of a 0.36 M solution

of the strong base NaOH?13.55

UNIT 13 – Everything Else

What does pH measure?Concentration of hydrogen ionsIf a substance has a pH of 3, what is its pOH?

11