Quiz 2: Equilibrium

In an exothermic reaction, heat is ...

• taken in
• given out

In an endothermic reaction, heat is 

• taken in
• given out

A substance that increases speed of chemical reaction without being being changed is called:

• Catalyst
• Acid
• Base
• pressure

Activation energy is required to start a chemical reaction. What is activation energy?

• The energy needed for a reaction to occur
• The minimum amount of energy needed for a reaction to potentially occur
• The energy added by a catalyst
• The energy possessed by the products

Increase in temperature of the reactants can do one of the following

• Slow collision frequency
• Allow less effective collision between the particles
• Cause particles to lose speed
• Increase collision between the particles thus increasing the rate.

The amount of a substance in a given volume.

• concentration
• temperature
• surface area
• catalyst

This symbol indicates that a reaction is ____________

• reversible
• irreversible

Which is the reactant - and why?

• A, as concentration decreases
• B, as concentration decreases
• A, as concentration increases
• B, as concentration increases

When the system X + 2 Y <=> Z has reached equilibrium, which of the following is TRUE?

• Forward reaction and Backward reaction stop.
• Forward reaction has sped up and backward reaction has slowed down.
• Forward and backward reactions occur at the same rate.
• Forward reaction has slowed down and backward reaction has sped up.

At what time the reaction reached equilibrium?

• t₁
• t₂
• t₃
• t₄