Physical/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. 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 baking.

Front

What happens to the molecules during a physical change?

Back

During a physical change, the molecules rearrange but do not change their chemical structure.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the molecules break apart and recombine to form new substances.

Front

What is an example of a physical change?

Back

Melting ice, dissolving sugar in water, and breaking a glass are examples of physical changes.

Front

What is an example of a chemical change?

Back

Baking a cake, burning wood, and rusting iron are examples of chemical changes.

Front

What is flammability?

Back

Flammability is a chemical property that describes how easily a substance can catch fire and burn.

Front

What is a sign of a physical change?

Back

A sign of a physical change is a change in shape, size, or state of matter without the formation of a new substance.

Front

What is a sign of a chemical change?

Back

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

Front

Is melting a chocolate bar a physical or chemical change?

Back

Melting a chocolate bar is a physical change.