Chemical/Physical Properties and Changes

Chemical/Physical Properties and Changes

Physical Properties

• Properties that can be observed without changing the identity of the substance.

Chemical Properties

Chemical properties describes how a substance reacts to other substances.

The question to ask!

Are these properties determined without changing the identity of the substance?

Multiple Choice

Water (H₂O) freezes at zero degrees celsius. Is freezing an example physical or chemical property?

• physical property

• chemical property

Multiple Choice

An iron nail is left outside on the porch exposed and rusts. Is rusting an example of a physical or chemical property?

• physical property

• chemical property

Multiple Choice

An object catches on fire. Is this flammability an example of physical or chemical property?

• physical property

• chemical property

Multiple Choice

The smell and taste of vanilla is very strong. Are odor and taste examples of a physical or chemical properties?

• physical property

• chemical property

Physical Changes

Physical changes have the same identity but change in physical state or appearance.

Can you get the original substance back?

Chemical Changes

Chemical changes involve how substances react to other substances.

Chemical changes create new substances. (Not just changes in appearance.)

Can you get the original substance back?

Multiple Choice

Is baking a cake a physical or chemical change?

• physical change

• chemical change

Multiple Choice

Is burning wood in a campfire a physical or chemical change?

• physical change

• chemical change

Multiple Choice

Is dissolving sugar into water a physical or chemical change?

• physical change

• chemical change

Multiple Choice

Is boiling water a physical or chemical change?

• physical change

• chemical change