Chemistry B CFA 1 Review Quiz - Trimester 3 2014

24 Questions | By Klt7560 | Updated: Mar 20, 2022 | Attempts: 625

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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.

Questions and Answers

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 NO₂in 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 CH_4. (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 15.0^oC 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