2.5 Physical and Chemical Changes in Matter Flashcard

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. Examples include melting, freezing, and dissolving.

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. Examples include rusting, burning, and cooking.

Front

What happens to matter during a physical change?

Back

During a physical change, matter changes its state or appearance but remains the same substance.

Front

What happens to matter during a chemical change?

Back

During a chemical change, matter transforms into one or more different substances with new chemical properties.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that matter cannot be created or destroyed in a chemical reaction; it can only change forms.

Front

Give an example of a physical change.

Back

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

Front

Give an example of a chemical change.

Back

An example of a chemical change is baking a cake, where ingredients react to form a new substance.

Front

How can you tell if a change is physical or chemical?

Back

If the change involves a new substance being formed, it is a chemical change. If the substance remains the same but changes state or appearance, it is a physical change.

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

Is boiling water a physical or chemical change?

Back

Boiling water is a physical change because it changes from liquid to gas without altering its chemical composition.