Chemical and Physical Changes

Front

What is a chemical change?

Back

A chemical change is a process where substances combine or break apart to form new substances with different properties. Examples include digestion of food, combustion of gasoline, and burning wood.

Front

What is a physical change?

Back

A physical change is a process that alters the form or appearance of a substance but does not change its chemical composition. Examples include squeezing oranges for juice and mixing sugar with water.

Front

When food digests, is it a chemical or physical change?

Back

Chemical Change

Front

What happens when gasoline combusts in an engine?

Back

It undergoes a chemical change, producing exhaust.

Front

What is an example of a physical change?

Back

Squeezing oranges for juice.

Front

What is an example of a chemical change?

Back

Burning wood, which produces smoke and ash.

Front

Is mixing sugar and water a chemical or physical change?

Back

Physical Change

Front

What are indicators of a chemical change?

Back

Indicators include color change, temperature change, gas production, and formation of a precipitate.

Front

What is the difference between a chemical change and a physical change?

Back

A chemical change results in new substances, while a physical change does not alter the chemical composition of the substance.

Front

Can a chemical change be reversed?

Back

Most chemical changes are not easily reversible, unlike physical changes which can often be reversed.