Physical vs. Chemical Changes

A physical change is a change that affects one or more physical properties of a substance without altering its chemical composition. Examples include changes in state, such as melting or freezing.

A chemical change is a change that results in the formation of new chemical substances. It involves a chemical reaction and the rearrangement of atoms. Examples include burning, rusting, and digestion.

Melting ice is a physical change.

Burning wood is a chemical change.

In a chemical change, the original substances are transformed into new substances with different properties.

An example of a physical change is ice forming and then melting back into water.

An example of a chemical change is the reaction of vinegar and baking soda, which produces carbon dioxide gas.

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

Ripping paper is a physical change.

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