# Chemistry B CFA 1 Review Quiz - Trimester 3 2014

24 Questions | Attempts: 625  Settings  This is the review quiz for the Chemistry B CFA 1. Please take and review answers at the end. You may take this quiz unlimited amount of times until a passing score is achieved. You will be given a test grade for this quiz; therefore please retake until you reach a score of 90% or above.

• 1.
Molar Mass of glucose (CO2) in grams per mole? (Hint: Use periodic table and add molecular weights of the atoms)
• A.

340.0

• B.

180.0

• C.

110.0

• D.

78.0

• E.

44.0

• 2.
What is the molar mass of H2 in grams per mole (Hint: Use periodic table and add molecular weights of the atoms)
• A.

15.0

• B.

2.0

• C.

4.0

• D.

5.2

• E.

3.5

• 3.
What is the molar mass of NOin grams per mole. (Hint: Use periodic table and add molecular weights of the atoms)
• A.

16.2

• B.

46.0

• C.

44.0

• D.

13.1

• E.

None of the above

• 4.
What is the molar mass of CH4. (Hint: Use periodic table and add molecular weights of the atoms)
• A.

16 grams per mole

• B.

20 grams per mole

• C.

24 grams per mole

• D.

30 grams per mole

• E.

14 grams per mole

• 5.
A gas in a balloon measures 2.2 L 1.1 atmospheres and 32 degrees Celsius. The environment is changed and the balloon is now 1.8 L and 1.4 atmospheres. What is the new temperature? (Hint 1: Always change temperature to Kelvin scale. To change from Celsius to Kelvin: add 273) Hint 2: Pressure volume and temperature are all changed. Use the combined gas law:
• A.

317.6 K

• B.

33.32 K

• C.

384.3 K

• D.

0.02 K

• 6.
A gas at a temperature of 80Celsius and a volume of 3.2 Liters is brought into an area with the temperature of 100 Celsius, what is the new volume if the pressure remains constant? (Hint : ALL GAS PROBLEMS MUST use the KELVIN temperature scale.) (To change from Celsius to Kelvin: add 273)
• A.

3.38 L

• B.

2.84 L

• C.

3.75 L

• D.

2.4 L

• 7.
If pressure of a gas is 1.2 atmospheres with a volume of 12 L, how much pressure is exerted by the gas if the volume is changed to 9L? (Assume constant temperature)
• A.

.9 L

• B.

129.6 L

• C.

6.0 L

• D.

1.6 L

• 8.
1. According to the Law of Conservation of Matter, the total mass of all the reacting substance is—
• A.

A. more than the mass of all the products.

• B.

B. more than the total mass of all the products and the reactants.

• C.

C. less than the total mass of all the products.

• D.

D. equal to the mass of all the products.

• 9.
2. What are the coefficients that would correctly balance this reaction? ____Ni + ____C4H8N2O2 → ____Ni(C4H8N2O2)2
• A.

F. 1, 2, 1

• B.

G. 2, 2, 1

• C.

H. 2, 1, 1

• D.

J. 2, 2, 2

• 10.
3. For the reaction HCl + NaOH --> NaCl + H2O, which reactant is the limiting reactant given 100.0 g of sodium hydroxide and 100.0 g of hydrochloric acid?
• A.

A. hydrochloric acid

• B.

B. sodium hydroxide

• C.

C. sodium chloride

• D.

D. water

• 11.
4. In the reaction 2RbNO3 → 2RbNO2 + O2, how many moles of O2 are produced when 5.0 mol of RbNO3 decompose?
• A.

F. 1.0 mol

• B.

G. 2.5 mol

• C.

H. 3.0 mol

• D.

J. 7.5 mol

• 12.
5. In the reaction 2 H2 + O2 → 2 H2O, how many moles of oxygen are required to fully react with 6.0 mol of hydrogen?
• A.

A. 3.0 mol

• B.

B. 6.0 mol

• C.

C. 12.0 mol

• D.

D. 18.0 mol

• 13.
6. In the reaction 2 H2 + O2 → 2 H2O, what is the mole ratio of hydrogen to water?
• A.

A. 2 : 2

• B.

B. 2 : 1

• C.

C. 1 : 2

• D.

D. 4 : 4

• 14.
7. In the reaction N2 + 3 H2 → 2 NH3, what is the mole ratio of hydrogen to nitrogen?
• A.

F. 1 : 1

• B.

G. 1 : 2

• C.

H. 3 : 1

• D.

J. 3 : 2

• 15.
8. A student burns 1.50 mol C3H8 according to the following reaction:          C3H8 + 5O2 → 3CO2 + 4H2O How many grams of carbon dioxide are produced?
• A.

A. 4.40 × 101 g

• B.

B. 6.61 × 101 g

• C.

C. 1.32 × 102 g

• D.

D. 1.98 × 102 g

• 16.
9. A three (3.00) mole sample of K2S would have how many atoms of potassium?
• A.

F. 2.01 x 1023

• B.

G. 1.21 x 1024

• C.

H. 1.81 x 1024

• D.

J. 3.62 x 1024

• 17.
11. What is the percent of hydrogen in methane, CH4?
• A.

F. 16.0

• B.

G. 25.1

• C.

H. 74.9

• D.

J. 100.0

• 18.
12. Which of the following is the mass in grams of 4.25 × 10³ mol of N2?
• A.

A. 2.35 × 10-4 g

• B.

B. 1.52 × 102 g

• C.

C. 5.95× 104 g

• D.

D. 1.19 × 105 g

• 19.
13. What is the new pressure of 150 mL of a gas that is compressed to 50 mL when the original pressure was 3.0 atm and the temperature is held constant?
• A.

F. 100 atm

• B.

G. 0.90 atm

• C.

H. 1.0 atm

• D.

J. 9.0 atm

• 20.
13. What is the new pressure of 150 mL of a gas that is compressed to 50 mL when the original pressure was 3.0 atm and the temperature is held constant?
• A.

F. 100 atm

• B.

G. 0.90 atm

• C.

H. 1.0 atm

• D.

J. 9.0 atm

• 21.
14. If the temperature of a gas changes, but the number of moles and volume remain constant, which of the following values must also change?
• A.

A. density

• B.

B. pressure

• C.

C. number of atoms

• D.

D. mass

• 22.
15. A sample of a gas in a rigid container at 30.0°C and 2.00 atm has its temperature increased to 40.0°C. What will be the new pressure?
• A.

F. 1.03 atm

• B.

G. 1.94 atm

• C.

H. 2.07 atm

• D.

J. 6.04 atm

• 23.
12. Calculate the approximate volume of a 1.50 mol sample of gas at 15.0oC and a pressure of 3.75 atm.
• A.

A. 1.73 L

• B.

B. 5.93 L

• C.

C. 8.65 L

• D.

D. 9.46 L

• 24.
13. The volume of a gas is 50.0 mL at 20.0 K. What will be the new temperature if the gas is compressed to 10.0 mL under constant pressure?
• A.

F. 2.50 K

• B.

G. 3.00 K

• C.

H. 4.00 K

• D.

J. 5.00 K

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