Matter is…

• Anything that has mass and takes up space.

Properties

• Properties describe matter.

• Properties tell us something about matter.

Physical Property

•Can be observed without changing the substance.

Chemical Property

•Can only be observed during a chemical reaction (while the substance is changing into something new).

Physical Change

•Substance may seem different, but the way the atoms connect is the same.

It’s a physical change if

•It changes shape or size

•It dissolves.

•It changes state (freezes, boils, evaporates, condenses)

It’s a physical change if...

Ask yourself this…

• Is it still the same “stuff” after the change?

• If it IS still the same stuffthen it is a…

Physical Change

•Changes the way the atoms connect

•Makes new substances

Chemical Change

It’s a chemical change if….

•It burns

•Temperature changes without heating/cooling

It’s a chemical change if...

•It bubbles (makes a gas)

It’s a chemical change if...

•It changes color

•It forms a precipitate

Ask yourself this…

• Is it still the same “stuff” after the change?

• If it is NOT still the same stuffthen it is a…

Chemical Change

What kind of change is it if someone...

•Tears up paper?•Physical change•Mixes salt and water?•Physical change

What kind of change is it if someone...

•Burns paper?•Chemical change•Evaporates salt water?•Physical change

What kind of change is it if someone...

•Mixes vinegar and baking soda?

•Chemical change