definitions

Question 1

Atom

Answer 1

smallest units/ particles that exist

Question 2

Compound

Answer 2

smallest unit of two or more atoms bonded together

Question 3

Pure substance

Answer 3

an element that cannot be broken down by simple chemical means

Question 4

Pure compound

Answer 4

a compound that can be broken down into two or more elements

Question 5

Homogeneous mixture

Answer 5

uniform in appearance and properties throughout (consists of two or more substances)

Question 6

Heterogeneous mixture

Answer 6

has two or more physically distinct phases

Question 7

Solid

Answer 7

definite shape and volume

Question 8

Liquid

Answer 8

definite volume, shape is determined by container

Question 9

Gas

Answer 9

volume and shape determined by the container

Question 10

physical change

Answer 10

alters physical properties of a substance without altering its chemical composition

Question 11

Liquid to gas

Answer 11

vaporization

Question 12

Gas to liquid

Answer 12

condensation

Question 13

solid to gas

Answer 13

sublimation

Question 14

gas to solid

Answer 14

deposition

Question 15

solid to liquid

Answer 15

melting

Question 16

liquid to solid

Answer 16

freezing

Question 17

Law of conservation of energy

Answer 17

the energy of the universe is a constant )energy cannot be created or destroyed; just transferred