Download SAMPLE EXAM #2

SAMPLE EXAM #2
1. Which of the following change would be an example of a chemical change?
a. water evaporating from a dish
b. tearing a piece of paper into two parts
c. frost forming on a car windshield
d. burning a piece of wood in a fireplace
e. adding chocolate syrup to milk
2. When the following equation is completely balanced using the smallest whole number
coefficients, the coefficient for HCl will be
Sb2S3 + __HCl
SbCl3 + H2S
a. 1
b. 2
c. 3
d. 6
e. 12
3. When the following equation is completely balanced using the smallest whole number
coefficients, the coefficient for O2 will be
C2H4O2 + __O2
CO2 + H2O
a. 1
b. 2
c. 3
d. 4
e. 6
4. When copper metal reacts with sulfur vapors, the following reaction occurs. This is a
2Cu(s) + S(g)
Cu2S(s)
a. combination reaction
b. combustion reaction
c. single replacement reaction
d. double replacement reaction
e. decomposition reaction
5. What is the molar mass of iron(III) nitrate?
a. 117.8g
b. 145.8g
c. 229.4g
d. 241.8g
e. 353.4g
6. A 0.250 mole sample of C6H12 contains how many Hydrogen atoms?
a. 12 atoms
b. 3 atoms
c. 1.50 x 1023 atoms
d. 1.81 x 1024 atoms
e. 2.15 x 1022 atoms
7. How many moles is 35.0 g of sulfur dioxide?
a. 0.546 mol
b. 1.83 mol
c. 1.00 mol
d. 2,240 mol
e. 0.728 mol
8. For the balanced reaction below, the complete reaction of 2 moles of HCl will produce
4 HCl + O2
2 Cl2 + 2 H2O
a. 4 moles of Cl2
b. 2 moles of Cl2
c. 1 mole of H2O
d. 8 moles of H2O
e. 0.5 mole of Cl2
9. Using the reaction below, if an 8.5 g sample of NH 3 is allowed to completely react, then what
mass of N2 is produced?
4 NH3 + 3 O2
2 N 2 + 6 H 2O
a. 8.5 g
b. 28 g
c. 14 g
d. 7.0 g
e. 0.25 g
10. How many calories are required to heat 45 g of aluminum from 20. oC to 100.oC if the
specific heat of aluminum is 0.22 cal/goC?
a. 200 cal
b. 990 cal
c. 80. cal
d. 790 cal
e. 18 cal
11. A serving of chicken contains 20. g of protein, 3 g of fat, and 0 g of carbohydrate. About
how many kilocalories of energy does this serving contain?
a. 110 kcal
b. 80. kcal
c. 92 kcal
d. 5 kcal
e. 320 kcal
12. Ethanol freezes at approximately minus 174oF. What is the temperature in Kelvin?
a. 159K
b. -114K
c. 99K
d. 352K
e. 67K
13. How many calories of heat are required to melt 65g of ice at 0 oC to liquid water at 0oC?
a. 5.2 kcal
b. 0 kcal
c. 35 kcal
d. 65 cal
e. 80. cal
14. A 250. g amount of water is placed in a pan and heated until all of the water is converted into steam.
What is the total amount of heat added if the water was at 25 oC and the steam was at 100oC?
a. 18.8 kcal
b. 135 kcal
c. 25.0 kcal
d. 154 kcal
e. none of the above
15. According to the kinetic molecular theory for gases, particles of a gas
a. are very large particles.
b. are very far apart.
c. lose their valence electrons.
d. move slowly.
e. decrease kinetic energy as temperature increases.
16. Which relationship is INCORRECT?
a. as the temperature of a gas increases, the volume increases.
b. as the volume of a gas increases, the moles of gas increases.
c. as the pressure of a gas increases, the temperature decreases.
d. as the volume of a gas increases, the pressure decreases.
e. all of the above are incorrect.
17. A gas at a pressure of 2.0 atm and temperature of 35 oC is warmed to 70oC. What is the
new pressure if the volume and the moles are held constant?
a. 4.0 atm
b. 1.0 atm
c. 2.2 atm
d. 1.8 atm
e. 3.0 atm
18. A sample of O2 at STP (standard temperature and pressure) occupies 7.50 L. How many
grams of O2 are in this sample?
a. 168 g
b. 0.335 g
c. 5380 g
d. 10.7 g
e. 5.36 g
19. A weather balloon filled with 15.0 L of helium gas at a pressure of 735 mm Hg and a temperature of
15oC is released from the ground and rises into the upper atmosphere. What is the pressure (in
mmHg) of the helium gas in the balloon when the temperature is –35oC and the volume becomes
25.7 L?
a. 355
b. -1000
c. 519
d. 1040
e. 179
20. A gas mixture containing 0.250 moles of O2 and 1.750 moles of He has a total pressure
of 3800. mmHg. What is the partial pressure of the O 2, in mmHg?
a. 475
b. 543
c. 3325
d. 950
e. 2027
Answer Key: 1D, 2D, 3B, 4A, 5D, 6D, 7A, 8C, 9D, 10D, 11A, 12A, 13A, 14D, 15B, 16C, 17C, 18D, 19A, 20A