Chapters 1-4

Question 1

Mixture

Answer 1

A physical blend of two or more pure substances in any proportion in which each substance retains its individual properties; can be separated by physical means.

Question 2

Product

Answer 2

A substance formed during a chemical reaction.

Question 3

Phase

Question 4

Reactant

Answer 4

a substance that enters into and is altered in the course of a chemical reaction.

Question 5

Heterogeneous mixture

Answer 5

a mixture in which the composition is not uniform throughout the mixture.

Question 6

Vapor

Answer 6

a gas-phase material that that normally exists as a liquid or solid under a given set of conditions

Question 7

Mass number

Answer 7

mass number = protons + neutrons

Question 8

Atomic mass unit

Answer 8

The atomic mass unit (AMU or amu) of an element is a measure of its atomic mass.

Question 9

Atomic number

Answer 9

he number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.

Question 10

atomic mass

Answer 10

the average mass of the atoms of an element measured in atomic mass unit

Question 11

Isotopes

Answer 11

atoms that have the same number of protons and electrons but different numbers of neutrons and therefore have different physical properties.