They begin to move more slowly and are drawn back together.

They begin to move more quickly and spread out.

They begin to move more slowly and are drawn back together.

They begin to move more quickly and spread out.

evaporation

condensation

melting

sublimation

melting

freezing

evaporation

condensation

solid

liquid

gas

solid

liquid

gas

Atoms of one element that are bonded tightly to the atoms of another element

Made up of two or more elements that can be easily separated from each other.

A substance that contains only one type of atom

Atoms of one element that are bonded tightly to the atoms of another element

the number of protons and neutrons are the same

the number of protons and electrons are the same

the number of electrons and protons are the same

Groups

Periods

Families

Metaloids

Groups

Periods

Families

Metaloids

a transition metal

a noble gas

a halogen

an alkali metal

a group of elements that are all the same

a group of elements mixed together that can be easily separated

two or more types of elements that have been joined or bonded together

all of the above

chemical change

physical change

physical change

chemical change

chemical change

physical change

the same as the number of protons

the atomic mass minus the number of protons

the protons and neutrons added together

none of the above

bubbles appear

there is an odour

increase or decrease in temperature

all of the above

physical change

chemical change

hydrogen + sodium  $\rightarrow$  water

hydrogen + oxygen  $\rightarrow$  water

hydrogen + sodium  $\rightarrow$  water

hydrogen and oxygen = water

combustion

reactants

catalysts

enzymes

solid

liquid

gas