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. Examples include melting, freezing, and dissolving.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is an example of a chemical change?

Back

When the two chemicals inside an ice pack are mixed, it becomes cold, indicating a chemical change.

Tags

NGSS.MS-PS1-2

Front

What is a clue that a chemical change has occurred?

Back

A new substance formed is a key clue that a chemical change has occurred.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What happens to a candle wick when it is lit?

Back

The candle wick starts to smoke, which is an indication of a chemical change.

Tags

NGSS.MS-PS1-2

Front

Is density a chemical or physical property?

Back

Density is a physical property.

Front

What is an example of a physical change?

Back

Ice turning into water and then steam is an example of a physical change.

Tags

NGSS.MS-PS1-4

Front

What are some signs of a chemical change?

Back

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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the difference between a physical property and a chemical property?

Back

A physical property can be observed without changing the substance's identity, while a chemical property can only be observed during a chemical reaction.

Front

What is an example of a physical property?

Back

Color, shape, size, and density are examples of physical properties.