1) The reaction is at dynamic equilibrium.
N2 + 3H2 ⇌ 2NH3
Which statement is correct?

a) Nitrogen and hydrogen combine at the same rate that ammonia breaks down.

b) The solution has the same concentrations of nitrogen gas and ammonia.

c) Both directions of the reaction have stopped.

d) The solution has the same concentrations of nitrogen and hydrogen gases.

2) Sodium chloride and calcium carbonate combine to form sodium carbonate and calcium chloride in the reversible reaction.
2NaCl + CaCO3 ⇌ Na2CO3 + CaCl2
Which statement about the reaction is necessarily correct?

a) The reaction will continue until the sodium chloride is used up.

b) The rate at which calcium chloride is equal to the rate at which sodium chloride is produced.

c) Both calcium carbonate and sodium carbonate are being produced.

d) The reaction is moving only from left to right.

3) In a chemical reaction, the forward rate is greater than the reverse rate. Which statement about the reaction is correct?

a) The reaction is reversible.

b)The reaction is at dynamic equilibrium.

c)The reaction will continue until the reactant is used up.

d)The concentrations of the reactant and the product are equal.

4) What is the fastest motion that can be measured in any frame of reference?

a)300,000 m/s

b)300,000 km/s

c)186,000 m/s

d)186,000 km/s

5) Two people are on a train that is moving at 10 m/s north. They are walking 1 m/s south relative to the train. Relative to the ground, their motion is 9 m/s north.
Why are we able to use these motions to describe the motion relative to the ground?

a)As long as the frame of reference is stationary, all motion can be described in this way.

b)If one object is moving much slower than the speed of light, its speed can be added to that of another object.

c)The motion of everything in the Universe besides light can be described in this way.

d)The people are moving much slower than the speed of light so the ground acts as a frame of reference.