8th Grade 4.3

Multiple Choice

Increasing the surface area of the reactants will decrease the rate of the reaction.

• true

• false

Multiple Choice

The amount of a substance in a given volume is the concentration of the substance.

• true

• false

Multiple Choice

The effect of a catalyst on a reaction is to raise the activation energy.

• true

• false

Multiple Choice

Only some reactions require activation energy.

• true

• false

Multiple Choice

An inhibitor decreases the rate of a reaction.

• true

• false

Multiple Choice

The burning of fuels, such as coal, natural gas, or oil, involves a(n) _______ reaction.

• physical

• endothermic

• exothermic

Multiple Choice

In an endothermic reaction, the energy of the products is _______ the energy of the reactants.

• greater than

• less than

• equal too

Multiple Choice

Increasing the temperature of a reaction will _______ the rate of the reaction.

• increase

• decrease

• not affect

Multiple Choice

The amount of a substance in a given volume is called

• atomic weight

• molecular weight

• concentration

Multiple Choice

Biological catalysts in the human body are called

• enzymes

• inhibitors

• conductors