Unit 1 Review

What is the smallest unit that defines an element?

• proton

• atom

• molecule

• element

A single substance, either an element or compound, with definite composition and properties.

• Compound

• Element

• Pure Substance

• Mixture

Mixtures are different than pure substances because mixtures–

• have lower boiling points.

• can be separated by physical means.

• are less dense than pure substances.

• contain only one type of atom.

What are the horizontal rows on a periodic table called?

• groups

• family

• periods

• compounds

What is the charge of a electron?

• positive

• neutral

• none

• negative

• 2

• 3

• 6

• 5

Two particles of the element oxygen are chemically bound. The two particles compose what?

• atom

• compound

• mixture

• molecule

Air is a mixture?

• True

• False

True or False: Protons and Electrons are found in the nucleus of an atom?

• True

• False

Which of the following is not a compound?

• HF

• NaCl

• Pd

• CO