chemical properties-and-changes

Do you remember what Physical Properties are???

• Color

• Shape

• Mass

• State of Matter

• Length

• Magnetism

Chemical Properties determine how a substance interacts with other substances

Some examples are:*flammability*reactivity to an acid*reactivity to water

After a PHYSICAL CHANGE, the appearance of the substance may be different but it is still the same substance

EXAMPLES:

Cutting a steak

Cracking an egg

Chopping wood

Bending a metal

Tearing paper

After a CHEMICAL CHANGE, a new substance is produced with NEW PROPERTIES. These properties are different from the original substance!

EXAMPLES:Burning woodFrying an egg

Digesting a steak

Rusting of metal

Here are some signs that a CHEMICAL CHANGE took place:

New color

New odor or smell

Gas bubbles or smoke

An increase or decrease in temperature

Physical or Chemical???Use the A-F cards to separate the Physical Changes from the

Chemical Changes!

A. You cut a sheet of aluminum foil in half

B. Your friend melts some butter for her popcorn

C. Your Mom lights a candle in a dark room

D. Rubbing alcohol evaporates from your hand

E. Hydrogen peroxide bubbles when you put it on a cut on your leg

F. You leave the milk on the counter all night and discover it has soured in the morning