Writing Formulas and Naming Compounds

Vocabulary

1

An atom that has gained or lost electrons

ion

2

A compound made of exactly two elements

Binary compound

3

A charged group of atoms acting as one unit

polyatomic ion

4

A compound with water molecules attached

hydrate

5

A compound without water attached

anhydrous

Hydrates

1

What does the dot (·) mean in a hydrate?

Water is attached

2

How many water molecules are in pentahydrate?

5

3

Name CuSO₄·5H₂O

copper(II) sulfate pentahydrate

4

Which is anhydrous: CuSO₄·5H₂O or CaCl₂?

CaCl₂

5

Write the formula for magnesium sulfate hexahydrate

MgSO₄·6H₂O

Formula Factory

1

Magnesium + chlorine

MgCl₂

2

Calcium + oxygen

CaO

3

Aluminum + sulfur

Al₂S₃

4

Iron(III) oxide

Fe₂O₃

5

Calcium nitrate

Ca(NO₃)₂

Name that compound

1

NaCl

sodium chloride

2

MgO

magnesium oxide

3

CuO

copper(II) oxide

4

CO

carbon monoxide

5

N₂O₄

dinitrogen tetroxide

POLYATOMIC PARTY

1

Cl⁻, O²⁻, NO₃⁻, Mg²⁺

NO₃⁻

2

Write the formula for ammonium sulfate

(NH₄)₂SO₄

3

Name CaCO₃

calcium carbonate

4

Write the formula for sodium nitrate

NaNO₃

5

Which needs parentheses when doubled: NO₃⁻ or Cl⁻?

NO₃⁻