Lesson 1 Review Flashcard: Physical and Chemical Changes

A physical change is a change that does not alter the chemical identity of a substance. Examples include changes in state (solid, liquid, gas), size, or shape.

A chemical change is a change that results in the formation of one or more new substances with different chemical identities. Examples include rusting, burning, and cooking.

You can identify a physical change if the material can be easily separated or returned to its original state.

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

The identity of the substance remains the same during a physical change.

The identity of the substance changes during a chemical change, resulting in new substances.

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

An example of a chemical change is baking a cake, where new substances are formed.

A precipitate is a solid that forms from a liquid solution during a chemical reaction.

A significant change in color is an indicator that a chemical reaction may have occurred.