Properties & Physical Changes

All substances are made of?

• Atoms

• Water

• Molecules

• Stuff

Properties are like a substance's (a)   ?

Will the properties of these samples likely be the same or different?

• Different because the groups of atoms that make up each sample are different

• Different because there are more repeating groups of atoms in sample one.

• Same because they have one of the same type of atom.

• Same because they have the same number of atoms.

Physical Properties describe..

• How a substance LOOKS.

• How a substance REACTS.

What is an example of a PHYSICAL property?

• Flammability

• Toxicity

• Reactivity

• Density

Chemical properties describe..?

• How a substances LOOKS/BEHAVES.

• How a substance REACTS.

A phase change (melting, freezing, evaporating) is a..

• Chemical Change

• Physical Change

When matter changes from liquid to gas, what kind of change takes place?

• chemical

• physical

• energy

• thermal

Which statement describes why tearing paper and sharpening a pencil are physical changes?

• It is a change in how the objects are used.

• It is a change in the appearance of the objects.

• It is a change in the materials.

• It is a change in both appearance and the materials.

A chemical change occurs when..

• The identity changes but appearance does not.

• Neither the appearance or identity change.

• Both the physical properties and identity change.

• Appearance changes but identity does not.