Name: _____________________________________ Date: _________________
CHM 1025, Summer 2016, Exam 3 Review Packet (Broward Teaching Center)
1. What could be said about the following reaction?
N2(g) + O2(g) + 43kcal  2NO(g)
a. The rxn is endothermic and delta H will be negative.
b. The rxn is endothermic and delta H will be positive.
c. The rxn is exothermic and delta H will be negative.
d. The rxn is exothermic and delta H will be positive.
e. The rxn is endothermic and delta H will be zero.
2. How many grams are in 2 moles of lithium carbonate?
a. 100
b. 148
c. 132
d. 121
e. 97
3. If you have a 50mL of a 4M solution of HCl, what volume would you need to create a
solution of 9M?
a. 5 mL
b. 15 mL
c. 22 mL
d. 30 mL
e. 100 mL
4. How much energy would be required for 5g of oxygen gas to become ozone.
3O2(g)2O3
delta H = +285.4 kJ
a. 10 kJ
b. 18.4 kJ
c. 7.9 kJ
d. 6.5 kJ
e. 14.9 kJ
5. How many grams of potassium are in 25g of potassium carbonate?
a. 6.8
b. 14.1
c. 7.05
d. 13.9
e. 12.2
6. What is the % mass of Oxygen in CH3OH
a. 10%
b. 25%
c. 50%
d. 75%
e. 99%
7. What is the (m/m) concentration of 0.5 moles of NaCl in 20mL of water?
a. 04%
b. 20%
c. 48%
d. 59%
e. 11%
8. If you have a 25 mL of a 5M solution of HCl, how many moles are in the solution after
you change the volume to 50 mL?
a. 0.5
b. 0.125
c. 0.25
d. 1
e. 0.75
9. What volume of 3M NaOH would you need to titrate .5L of 5M HCl?
a. 0.56 L
b. 0.11 L
c. 0.73 L
d. 0.83 L
e. 0.13 L
10. What is the formal charge of the nitrogen in ammonium?
a. -2
b. -1
c. 0
d. +1
e. +2
11. How many grams of KCl are needed to make 300mL of a 4M solution?
a. 91.2
b. 89.5
c. 35.6
d. 61.9
e. 80.5
12. A sample of hydrocarbon undergoes complete combustion to produce 0.845 g of
CO2 and 0.173 g of H2O. What is the molecular formula of this compound, given that
its molar mass is around 52 g/mol?
a. C4H4
b. C5H5
c. C6H6
d. C7H7
e. C8H8
13. Calculate the number of oxygen atoms in 31.7 g of Iron (II) sulfate.
a. 7.46 x 1023
b. 3.23 x 1023
c. 1.45 x 1023
d. 4.07 x 1023
e. 5.03 x 1023
14. Which of the following molecules has the highest boiling point?
a. Nonane
b. Decane
c. Hexane
d. Heptane
e. Octane
15. A compound contains 13.5 g Ca, 10.8 g of O, and 0.675 g H. What is the empirical
formula of the compound?
a. Ca(OH)2
b. Ca2(OH)3
c. Ca3O2H2
d. CaOH
e. Ca2O2H2
16. What is the electron geometry of CCl4?
a. linear
b. trigonal planar
c. tetrahedral
17. Magnesium sulfate and calcium chloride react to form what precipitate?
a. Magnesium chloride
b. Calcium sulfate
c. Magnesium calcium
d. Chloride sulfate
e. Silver chloride
18. If 5g of nitrogen gas and 5g of hydrogen gas react to form ammonia what mass of the
reagent in excess remains?
a. 1.08 g
b. 3.17 g
c. 2.56 g
d. 3.94 g
e. 6.11 g
19. You run a combustion of hexane in excess oxygen. Given that you have 6 grams of
organic material, what is the percent yield given that 5.9 grams of water are produced?
a. 69%
b. 30%
c. 14%
d. 91%
e. 42%
20. Determine the highest attractive force in the following compounds.
LiBr H2O C5H12
a. H-Bond, Dispersion, Ionic
b. Ionic, Polar, Dispersion
c. Polar, H-Bond, Dispersion
d. Ionic, H-Bond, Dispersion
e. Dispersion, Polar, H-Bond