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.

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 chemical reaction and changes the chemical composition of the substance. Examples include burning, rusting, and photosynthesis.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

Is sharpening a pencil a physical or chemical change?

Back

Sharpening a pencil is a physical change because it alters the shape of the pencil without changing its chemical composition.

Front

Is making Kool-Aid a physical or chemical change?

Back

Making Kool-Aid is a physical change because it involves mixing water with the powder, which does not change the chemical composition of the substances.

Front

Is snow melting a physical or chemical change?

Back

Snow melting is a physical change because it changes from solid to liquid without altering its chemical structure.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Front

What is photosynthesis?

Back

Photosynthesis is a chemical change where plants convert carbon dioxide and water into glucose and oxygen using sunlight.

Tags

NGSS.MS-LS1-6

Front

Is taking out raisins from trail mix a physical or chemical change?

Back

Taking out raisins from trail mix is a physical change because it involves separating the raisins without changing their chemical composition.

Front

What are some indicators of a chemical change?

Back

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

Tags

NGSS.MS-PS1-2

Front

What happens to the molecules during a physical change?

Back

During a physical change, the arrangement of molecules may change, but the molecules themselves remain the same.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the bonds between molecules are broken and new bonds are formed, resulting in new substances.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5