Chemistry Unit Review

What's the charge of a proton?

• Positive

• Neutral

• Negative

What's the charge of an electron?

• Positive

• Neutral

• Negative

What's the charge of a neutron?

• Positive

• Neutral

• Negative

If you add thermal energy to a solid, it first becomes....

• a solid

• a liquid

• a gas

• a plasma

Oxygen is...

• an element

• a compound

• a homogeneous mixture

• a heterogeneous mixture

Salt is...

• an element

• a compound

• a homogeneous mixture

• a heterogeneous mixture

A pile of leaves is...

• an element

• a compound

• a homogeneous mixture

• a heterogeneous mixture

Hydrogen is...

• an element

• a compound

• a homogeneous mixture

• a heterogeneous mixture

The air we breathe is...

• an element

• a compound

• a homogeneous mixture

• a heterogeneous mixture

Milk is...

• an element

• a compound

• a homogeneous mixture

• a heterogeneous mixture