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.

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.

Front

Give an example of a chemical change.

Back

An example of a chemical change is rust forming on iron when it reacts with oxygen.

Front

Give an example of a physical change.

Back

An example of a physical change is melting ice into water.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the bonds between molecules are broken and new bonds are formed, resulting in new substances.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the arrangement of molecules may change, but their chemical structure remains the same.

Front

What is an indicator of a chemical change?

Back

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

Front

What is an indicator of a physical change?

Back

Indicators of a physical change include changes in state (solid, liquid, gas), shape, or size without altering the substance's chemical identity.

Front

Is dissolving sugar in water a chemical or physical change?

Back

Dissolving sugar in water is a physical change because the sugar can be recovered by evaporating the water.

Front

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

Back

The main difference is that a chemical change results in the formation of new substances, while a physical change does not.