Chemical Changes

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

What is evidence of a chemical reaction?

Back

Change in color, production of gas bubbles, formation of a precipitate, or release of heat.

Front

Can most chemical changes be reversed?

Back

No, most chemical changes cannot be reversed.

Front

What happens when wood is burned?

Back

It undergoes a chemical change, releasing ash and smoke.

Front

Is melting ice a chemical or physical change?

Back

Physical change.

Front

What is a physical change?

Back

A change that does not alter the chemical composition of a substance.

Front

Give an example of a chemical change.

Back

Rust forming on iron.

Front

What is an endothermic reaction?

Back

A reaction that absorbs heat from its surroundings.

Front

What is an exothermic reaction?

Back

A reaction that releases heat to its surroundings.

Front

What is a precipitate?

Back

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