Free Printable 3.4: Writing Chemical Formulas

Worksheets

3.4: Writing Chemical Formulas

Total questions: 35

Worksheet time: 46mins

Name

Class

Date

Chemical compound is formed when two or more ions are formed.

True

False

Choose the incorrect pairing below:

Cation -> positive

Anion -> negative

Ionic bonding -> metal to metal

Covalent bonding -> nonmetal to nonmetal

An atom must have how many valence electrons to become stable?

Which is positive ion?

Cation

Anion

Which is negative ion?

Cation

Anion

What is the first step in writing a chemical formula?

Write the multipliers as subscript of each element.

Identify the symbols and charges of the elements.

Balance the charges by looking for multipliers.

What is the correct chemical formula of sodium oxide?

Na2O

NaO2

The formula of copper(II) oxide is

CuO

Cu₂O

CuO₂

The formula of iron(III) oxide is

FeO

FeO₂

Fe₂O

Fe₂O₃

10.

The formula of magnesium chloride is

MgCl

MgCl₂

MgCl₃

11.

The formula of calcium hydroxide is

CaOH

Ca(OH)₂

Ca(OH)₃

12.

The formula of sodium carbonate is

NaCO₃

Na(CO₃)₂

Na₂CO₃

13.

The formula of ammonium ion is

NH₃

NH₃⁺

NH₄

NH₄⁺

14.

What is the chemical formula of sodium sulfate?

SSO₄

SoSO₄

NaSO₄

Na₂SO₄

15.

Ca⁺², O^-2

CaO

OCa

Ca_-2O₊₂

Ca₂O₂

16.

Ba⁺², Br^-1

BrBa

Br₂Ba₂

BaBr₂

Br₂Ba

17.

Ca⁺²P^-3

PCa

P₂Ca₃

CaP

Ca₃P₂

18.

K⁺, O^-2

K₂O

K_-2O₂

O₂K

19.

When adding a subscript to a polyatomic ion, you should...

multiply any subscripts on the polyatomic ion by the subscript you are adding

put parentheses around the polyatomic ion before adding a subscript

write the new subscript next to any subscripts on the polyatomic ion

put the polyatomic ion in square brackets before adding the subscript

20.

The chemical formula for an ionic compound of aluminum and chlorine is

AlCl.

ClAl.

AlCl₃.

Al₃Cl.

21.

Potassium sulfate is written as

K₄SO₂

P₂(SO₄)₃

K₂SO₄

P₄SO₃

22.

The formula for copper (II) hydroxide is

Cu(II)OH

Cu(OH)₂

Cu₂OH

CuOH₂

23.

The chemical formula for tin (IV) oxide is written

Sn₂O₄

Ti₂O₄

SnO₂

TiO₂

24.

Copper (I) cyanide is written

Cu(I)CN

CuCN

CuCn

CoCN

25.

The chemical formula for sodium sulfide

NaS

Na₂S

26.

Manganese (II) nitrate is written

MnNO₂

Mn(NO₂)₂

Mn(NO₃)₂

Mn(NO₂)₃

27.

Aluminum carbonate is written

AlCO₃

Al(CO₃)₃

Al₂(CO₃)₃

Al₃(CO₃)₂

28.

What is the formula for lead(IV) sulfate?

Pb(SO₄)₂

PbS₂

Pb(SO₃)₂

Pb₂SO₄

29.

Which is the correct formula for a compound made of aluminum and hydroxide?

AlOH₃

AlOH

Al(OH)₃

AlOH³

30.

Which is the correct formula for an ionic compound made from calcium and nitrate?

CaN₂

CaNO₃₂

Ca(NO₃)₂

CaNO₃²

CaNO₆

31.

What is the formula for Tricarbon Octahydride?

Ca₃O

C₂H₈

C₃H₈

Ca₃H₈

32.

What is Sulfur Trichloride?

SCl₃

SiCl₃

SCl₄

Si₃Cl

33.

Phosphorous trichloride

PCl₃

P₃Cl

P₃Cl₃

PCL

34.

Disulfur trioxide

S₃O₂

S₂O₃

S₂O

35.

Bromine monofluoride

Br₁F₁

BrF

Br₂F

BrF₂

100 %

3.4: Writing Chemical Formulas

Total questions: 35

Worksheet time: 46mins

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