Elements
Atoms
Chemical Formula
Pure vs. Impure
Substance

100

On the periodic table, H, stands for 

Hydrogen 

100

The smallest particle of an element 

atom

100

2 atoms of Oxygen 

02

100

A pure substance is

made from the same element or same repeating atoms

100

O2

Oxygen gas

200

On the periodic table, C, stands for 

Carbon

200

Formed when two or more atoms join together 

molecule 

200

one atom of carbon and four atoms of hydrogen

CH4

200

An impure substance is

a mix of atoms and elements that are different 

200

O3

Ozone

300

On the periodic table, Na, stands for

Sodium 

300

The three states of matter

solid, liquid, gas

300

one atom of sodium, one atom of oxygen, and one atom of hydrogen 

NaOH

300

four molecules of H2

pure

300

CH4

Methane 

400

On the periodic table, Cl, stands for 

Chlorine 

400

A molecule of sugar has 45 atoms. If a sugar crystal has 1000 molecules, how many atoms are present?

45,000

400

one atom of potassium and two atoms of magnesium 

KMg2

400

Make a model representing a pure substance

400

N2O

Nitrous Oxide 

500

On the periodic table, Au, stands for

Gold

500

The hierarchy of solids from least to greatest

atom, molecule, subunit, repeating subunits, crystal

500

one atom of titanium, one atom of iron, and four atoms of helium 

TiFeHe4

500

Make a model representing an impure substance 

500

H2CO3

Carbonic acid