Properties of Matter Pre-Check

An atom is the smallest unit of

• life

• a molecule

• matter

• a compound

A molecule is the smallest unit of

• life

• a cell

• matter

• a compound

Which of the following is the best example of a compound?

• Xe

• oxygen

• H2O

• air

The two major types of bonds are covalent and

• ionic

• weak

• strong

• polarized

Which is the best example of a physical property?

• reactivity

• color

• reaction rate

• burning

Which is the best example of a chemical property?

• reactivity

• density

• color

• melting point

Which may indicate a physical change?

• precipitate

• fire

• gas

• color change

Which may indicate a chemical change?

• phase change

• fire

• shape change

• dissolving

Which is an example of a homogeneous mixture?

• salad dressing

• oxygen

• H2O

• solution

An element's atomic number gives its number of

• protons

• ions

• electrons

• neutrons