1. CHEMISTRY SOL 4 REVIEW

2. UNIT 9 – Molar Conversions
Calculate the following:
0.35 mol F = _________ atoms F
3.25 moles CO2 = ________molecules
2.6 moles Cu = _______ g Cu
4.23 g NaCl = ________ moles NaCl
2.11 x 1023
1.96 x 1024
165.23
0.07

3. 2009 SOL question
The number of molecules in 48.0 g of oxygen gas (O2) is –
A x 1023
B x 1023
C x 1024
D x 1024

4. UNIT 9 – Molar Conversions
At STP, 1 mole of any gas occupies ______ Liters
22.4
What is the volume of 7.3 g of CO2 at STP?
3.72 L
Find the density of O2 gas at STP.
1.43 g/L

5. 2009 SOL question
What is the volume occupied by 51 g of NH3 gas at STP?
F L
G L
H L
J L

6. UNIT 10 - Stoichiometry
What is the mole ratio of Al:Br in the following equation?
2Al (s) + 3Br2 (l)  2AlBr3 (s)
 2:3
How many moles of O2 are produced when 2.35 moles of CO2 break down?
CO2  C + O2
2.35 moles

7. UNIT 10 - Stoichiometry LiOH + HBr  LiBr + H2O
If you start with 10 grams of lithium hydroxide, how many grams of lithium bromide will be produced?
36.25 g
2SO O2  2SO3
What is the limiting reactant if you have 0.25 moles of each reactant?
SO2

8. 2009 SOL question
3.85 g
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

9. UNIT 10 - Stoichiometry LiOH + KCl  LiCl + KOH
I began this reaction with 20 grams of LiOH and produced 31 g of LiCl. What is my percent yield?
Theoretical = 35.4 g
Percent Yield = 87.6%

10. UNIT 11 – Gas Laws
Increasing the number of particles will ____________ the pressure of a gas.
 Increase
Increasing volume will ________ the pressure of a gas.
 Decrease
Decreasing the temperature will _______________ the pressure of a gas
Decrease

11. UNIT 11 – Gas Laws
Draw a graph to show the relationship of volume and pressure.

12. 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

13. UNIT 11 – Gas Laws
When using any of the gas laws, what unit must you use for TEMPERATURE?
 Kelvin
If 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 = P2V2
3.33 x 10-5 L

14. 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/T2
0.71 L

15. 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 =
n = 1.26 moles

16. UNIT 12 - Solutions What units do we use when measuring molarity (M)?
 moles/L
How many moles of HCl are needed to make 675 mL of a 2.0 M solution?
1.35 moles

17. UNIT 12 - Solutions
In terms of solubility, polar substances tend to dissolve in _______________ substances.
 Other polar
Why won’t oil and water stay mixed?
 Oil is nonpolar, water is polar 
List two ways you can speed the dissolving process.
 Stirring, Heating 

18. UNIT 12 - Solutions Which salt is most soluble at 10oC? KI
How many grams of KCl can be dissolved in 200 g of water at 80oC?
100 g KCl

19. UNIT 12 - Solutions
Adding salt to ice or water alters it by _____________ the freezing point.
Lowering/depressing
2.0 L of a 0.88 M solution is diluted to 3.8 L. What is the new molarity?
M1V1 = M2V2
0.46 M

20. 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 T
Q = J

21. 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 HCl?  1
What is the pH of a 0.36 M solution of the strong base NaOH?
13.55

22. UNIT 13 – Everything Else What does pH measure?
Concentration of hydrogen ions
If a substance has a pH of 3, what is its pOH? 11