Section 3 Controlling Chemical Reactions

Question 1

Activation energy

Answer 1

All chemical reactions require a certain amount of activation energy to get started

Question 2

Exothermic and endothermic reactions

Answer 2

Exothermic follows a pattern

Example= burning fuel, wood, natural gas , or oil

Endothermic absorbs energy

Question 3

Rates of chemical reactions

Answer 3

Factors that affect rates of reaction include surface area, temperature, concentration, and the presence of catalyst or inhibitors

Question 4

Surface area

Answer 4

If you break the solid into smaller pieces, more particles are exposed and the reaction happens faster

Question 5

Temperature

Answer 5

When you heat a substance, its particles move faster

Reducing temperature slows down reaction rates

Question 6

Concentration

Answer 6

Increasing concentration reactants supplies more particles to react

Question 7

Catalyst

Answer 7

Although catalyst affect a reactions rate they are not permanently changed by a reaction

Question 8

Inhibitors

Answer 8

Most inhibitors work by preventing reactants from coming together

They combine with one of the. Reactants either permanently or temporarily