9.2.Chemical Change

Front

What is a chemical change?

Back

A process where substances transform into new substances with different properties.

Front

What are indicators of a chemical change?

Back

Change in color, production of energy, formation of gas, and formation of a precipitate.

Front

What happens to atoms during a chemical reaction?

Back

Atoms break apart and combine in new ways to form new substances.

Front

What is a catalyst?

Back

A substance that speeds up a chemical reaction without being consumed in the process.

Front

What is an enzyme?

Back

A biological catalyst that accelerates chemical reactions in living organisms.

Front

How does temperature affect chemical reactions?

Back

Increasing temperature generally increases the rate of reaction by providing more energy to the particles.

Front

What is activation energy?

Back

The minimum energy required for a chemical reaction to occur.

Front

How can activation energy be supplied?

Back

By heating the reaction mixture or using a catalyst.

Front

What effect does concentration have on reaction rates?

Back

Increasing the concentration of reactants typically increases the rate of reaction.

Front

What is a precipitate?

Back

A solid that forms and settles out of a liquid mixture during a chemical reaction.