Physical and Chemical Changes

Front

What is a physical change?

Back

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances, involving a rearrangement of atoms.

Front

Give an example of a physical change.

Back

Melting ice is an example of a physical change, as it changes from solid to liquid without changing its chemical structure.

Front

Give an example of a chemical change.

Back

Burning wood is an example of a chemical change, as it transforms into ash and gases, creating new substances.

Front

What happens to the molecules during a physical change?

Back

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

Front

What happens to the molecules during a chemical change?

Back

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

Front

What is an indicator of a chemical change?

Back

Indicators of a chemical change include color change, temperature change, gas production, 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 chopping food a physical or chemical change?

Back

Chopping food is a physical change because it alters the size and shape of the food without changing its chemical composition.

Front

Is mixing Mentos and Coke a physical or chemical change?

Back

Mixing Mentos and Coke is a chemical change because it results in a rapid release of gas and a new reaction.