Question

1. The reaction of two gases in a

sealed container produces a different gas, and the system reaches equilibrium. What change in concentration would shift the equilibrium to the left?

A. Decreasing the concentration of either a reactant or the product

B. Increasing the concentration of either a reactant or the product

C. Decreasing the concentration of a reactant or increasing the concentration of the product

D. Increasing the concentration of a reactant or decreasing the concentration of the product

2.  H2 and I2 react in an exothermic reaction according to the following equation:

H2(g) + I2(g) Double arrow yields 2HI (g)

H2 and I2 are placed in a sealed container and are allowed to reach equilibrium. What could you change about the system that would shift its equilibrium position?

A. Add a catalyst.

B. Decrease the volume.

C. Increase the pressure.

D. Lower the temperature.

3. Nitrogen gas and oxygen gas react according to the following equation:

Energy + N2(g) + O2(g) Double arrow yields 2NO(g)

Nitrogen gas and oxygen gas are placed in a sealed container and are allowed to reach equilibrium. What effect will cooling the system have?

A. It will add more NO(g) to the system.

B.It will increase the concentration of N2(g).

C. It will decrease the rate of both the forward and the reverse reactions.

D. It will shift the equilibrium to the right.

4. Hydrogen gas and chlorine gas react according to the following equation:

H2(g) + Cl2(g) Double arrow yields 2HCl(g) + Energy

Hydrogen gas and chlorine gas are placed in a sealed container and are allowed to reach equilibrium. What effect will heating the system have?

A. It will add more HCl(g) to the system.

B. It will decrease the concentration of H2(g).

C. It will increase the rate of both the forward and the reverse reactions.

D. It will shift the equilibrium to the left.

5. Each of the following reactions is allowed to reach equilibrium in a sealed container. For which of the reactions could you shift the equilibrium to the right by decreasing the pressure?

A. CH4(g) + 2O2(g) Double arrow yields CO2(g) + 2H2O(l)

B. CaCO3(s) Double arrow yields CaO(s) + CO2(g)

C. Br2(g) + 3Cl2(g) Double arrow yields 2BrCl3(g)

D. 2H2S(g) + 3O2(g) Double arrow yields 2SO2(g) + 2H2O(g)

6. What is true of an element that was reduced in a chemical reaction?

A. It lost electrons.

B. It gained electrons.

C. It increased electronegativity.

D. It decreased electronegativity.

7.Which of the following chemical reactions is an oxidation-reduction reaction?

A. CuSO4 + BaCl2 yields BaSO4 + CuCl2

B. Pb(NO3)2 + 2NaCl yields PbCl2 + 2NaNO3

C. N2 + 3H2 yields 2NH3

D. K2SO4 + BaCl2 yields BaSO4+ 2KCl

8.What is the oxidation number of oxygen (O) in O2?

A. 0

B. +2

C. −2

D. +4

9.Which of the following describes an element that is oxidized in a reaction?

A. It gains electrons during a reaction.

B. It has a decrease in its oxidation number.

C. Al yields Al3+ + 3e−

D. F2 + 2e− yields 2 F−

10.Which of the following describes an element that is reduced in a reaction?

A. It acts in the reactant that is the reducing agent.

B. It has a decrease in its oxidation number.

C. Cd yields Cd2+ + 2e−

D. Zn + Cu2+ yields Zn2+ + Cu

11.Consider the following reaction:

Cl2 + 2NaBr yields 2NaCl + Br2

Which element is oxidized and which is reduced in the reaction?

A. Br is reduced and Na is oxidized.

B. Cl is reduced and Br is oxidized.

C. Cl is reduced and Na is oxidized.

D. Na is reduced and Br is oxidized.

12. What makes an atom radioactive?

A. Its electrons are easily pulled away.

B. Its protons and electrons repel each other.

C. Its nucleus can easily break apart over time.

D. Its neutrons are held more strongly than its protons.

13.What is an alpha particle?

A. A particle consisting of a positively charged electron

B. A particle consisting of one proton and two neutrons

C. A particle consisting of two protons and two electrons

D. A particle consisting of two protons and two neutrons

14. What occurs during beta decay?

A. A proton breaks apart into two electrons.

B. A proton breaks apart into two neutrons.

C. An electron breaks apart into a neutron and a proton.

D. A neutron breaks apart into an electron and a proton.

15. How is gamma radiation different from other types of electromagnetic radiation?

A. It has higher energy and higher frequency.

B. It has higher energy and lower frequency.

C. It has lower energy and higher frequency.

D. It has lower energy and lower frequency.

16. Look at the diagram of the atom.

Model of an atom. The central region contains seven small circles. Four of the small circles are shaded, and three are unshaded with a plus sign in each. The central region is surrounded by two rings. On the inner ring are two small, unshaded circles with a negative sign in each circle. On the outer ring is one small, unshaded circle with a negative sign in it.

What will it change to during beta decay?

A. An atom with 3 protons, 4 neutrons, and 3 electrons

B. An atom with 3 protons, 4 neutrons, and 4 electrons

C. An atom with 4 protons, 3 neutrons, and 4 electrons

D. An atom with 4 protons, 3 neutrons, and 3 electrons

17. A radon atom has 86 protons, 136 neutrons, and 86 electrons. What will it change to during alpha decay?

A. An astatine atom with 85 protons, 137 neutrons, and 86 electrons

B. A francium atom with 87 protons, 135 neutrons, and 86 electrons

C. A polonium atom with 84 protons, 134 neutrons, and 86 electrons

D. A radon atom with 86 protons, 136 neutrons, and 85 electrons

18.A polonium atom has 84 protons, 124 neutrons, and 84 electrons. What will it change to during alpha decay?

A. A lead atom with 82 protons, 122 neutrons, and 84 electrons

B. A bismuth atom with 83 protons, 123 neutrons, and 84 electrons

C. A polonium atom with 84 protons, 124 neutrons, and 85 electrons

D. An astatine atom with 85 protons, 123 neutrons, and 84 electrons

19.Which of the following statements is not true of nuclear fusion?

A. It involves the joining of two atoms together into one new atom.

B. It occurs in the sun and other stars.

C. It only occurs in very large, heavy atoms.

D. It releases very large amounts of energy.

20. A certain radioactive element has a half-life of one hour. If you start with 40.0 grams of the element at noon, how much of the radioactive element will be left at 2 p.m.?

A. 20.0 grams

B. 10.0 grams

C. 5.0 grams

D. 0.0 grams

21. Which of the following is not a safety precaution used in a nuclear power plant?

A. Separate water tanks are used to prevent radiation leaking to the outside environment.

B. A mixture of two types of uranium is used to prevent an explosion.

C. Filters are used to lower the amount of pollutants released into the environment.

D. Neutron-absorbing metal rods are used to control the rate of the chain reaction.

22.What type of reaction occurs when two hydrogen atoms collide at high speed, combining together into a helium atom?

A. Alpha decay

B. Beta decay

C. Fission

D. Fusion

 

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