Physical vs. Chemical Changes in Matter

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 changes in state, shape, or size.

Tags

NGSS.MS-PS1-4

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances. It involves a rearrangement of atoms and is often accompanied by energy changes, color changes, or the production of gas.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What are some indicators of a chemical change?

Back

Indicators of a chemical change include color change, temperature change, gas production (bubbles), formation of a precipitate, and changes in odor.

Tags

NGSS.MS-PS1-2

Front

Is burning biomass a physical or chemical change?

Back

Burning biomass is a chemical change because it involves a reaction with oxygen that produces new substances, such as ash and gases.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What happens when a glowstick is bent and shaken?

Back

Bending a glowstick cracks an internal container, allowing chemicals to mix and produce light through a chemical change.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

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

Back

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

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

Front

What is an example of a physical change?

Back

An example of a physical change is splitting logs into pieces. The logs remain wood, but their size and shape change.

Front

What is the significance of a precipitate in a chemical reaction?

Back

The formation of a precipitate indicates a chemical change has occurred, as it represents the creation of a new solid substance from a solution.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Can a chemical change be reversed?

Back

Some chemical changes can be reversed through other chemical reactions, but many are irreversible under normal conditions.

Tags

NGSS.MS-PS1-2

Front

What role does energy play in chemical changes?

Back

Energy is often absorbed or released during a chemical change, which can result in temperature changes or the release of light.

Tags

NGSS.MS-PS3-4