Free Printable Chemical Formulas and Atom Counts Review

1.

In the formula for calcium chloride, CaCl₂, there are ___ atoms of calcium in a formula unit.

a)

1

b)

2

c)

3

d)

it cannot be determined by current science

2.

In the formula for calcium chloride, CaCl₂, there are ___ atoms of chlorine in a formula unit.

a)

1

b)

2

c)

3

d)

it is estimated in the billions, but we're not sure

3.

The formula for sulfur trioxide is SO₃. There are ___ atoms of sulfur in a molecule.

a)

1

b)

2

c)

3

d)

4

4.

The formula for sulfur trioxide is SO₃. There are ___ atoms of oxygen in a molecule.

a)

1

b)

2

c)

3

d)

4

5.

Sulfur trioxide,SO₃, uses _______ bonds to hold the atoms together.

a)

metallic

b)

ionic

c)

covalent

d)

transcendental

6.

In the formula for sodium sulfate, Na₂SO₄, there are ___ different elements present.

a)

1

b)

2

c)

3

d)

5

7.

In the compound sodium sulfate, Na₂SO₄, there are ___ total atoms in a formula unit.

a)

4

b)

5

c)

6

d)

7

8.

The formula for caffeine is C₈H₁₀N₄O₂. There are ___ different elements in a molecule.

a)

4

b)

8

c)

24

d)

640

9.

The formula for caffeine is C₈H₁₀N₄O₂. There are ___ carbon atoms in a molecule.

a)

4

b)

8

c)

2

d)

10

10.

The formula for caffeine is C₈H₁₀N₄O₂. There are ___ nitrogen atoms in a molecule.

a)

4

b)

8

c)

2

d)

10

11.

The formula for caffeine is C₈H₁₀N₄O₂. There are ___ oxygen atoms in a molecule.

a)

4

b)

8

c)

2

d)

10

12.

What is the formula for hexasulfur decoxide?

a)

SO

b)

S₆O₁₀

c)

S₃O₅

d)

S₁₀O₆

13.

Bromine monoflouride

a)

Br₁F₁

b)

BrF

c)

Br₂F

d)

BrF₂

14.

The charge on the iron ion in the salt Fe₂O₃ is __________.

a)

1+

b)

2+

c)

3+

d)

5-

e)

6-

15.

The charge on the iron ion in the salt Fe₂O₃ is __________.

a)

1+

b)

2+

c)

3+

d)

5-

e)

6-

16.

H₂O

a)

b)

c)

d)

17.

CO₂

a)

Water

b)

Carbon Dioxide

c)

Energy

d)

Oxygen

18.

C₆H₁₂O₆

a)

b)

c)

d)

19.

O₂

a)

b)

c)

d)

20.

CO₂

a)

b)

c)

d)

21.

What is the oxidation number of Fe in FeO?

a)

+1

b)

-1

c)

+2

d)

-2

22.

What is the oxidation number of O in CO₂?

a)

+2

b)

-1

c)

+4

d)

-2

23.

The name of SO₃ is?

a)

sulfate

b)

sulfur oxiatic

c)

sulfur trioxide

d)

Heptasulfur tetraxide

24.

Binary compounds involve only

a)

1 element

b)

2 different elements

c)

3 different elements

d)

4 different elements

25.

What is the name of AgNO₃?

a)

Gold Nitrate

b)

Sodium Mononitrate

c)

Silver Nitrate

d)

Monogold Nitrate

26.

How many elements are in C₆H₁₂O_6?

a)

1

b)

2

c)

3

d)

4

27.

The _____ describes the atoms in a compound.

a)

Chemical Equation

b)

Chemical Formula

c)

Chemical Symbol

d)

Coefficient

28.

How many atoms of carbon (C) are in C₆H₁₂O_6?

a)

3

b)

6

c)

12

d)

24

29.

Element or Compound?

H₂O

a)

Element

b)

Compound

c)

Both

30.

The blue numbers in the image below represent _______

a)

I don't know, and don't want to try

b)

Coefficients

c)

Subscripts

d)

none of the answers are correct

31.

How many TOTAL atoms are in:

H₂SO₄

a)

6

b)

5

c)

7

d)

3

32.

How many atoms of Oxygen are in this compound?

a)

1

b)

2

c)

3

d)

4

33.

The number of Na's in Na₂CO₃

a)

1

b)

2

c)

3

d)

6

34.

How many Magnesium are in 10MgCl₂?

a)

10

b)

5

c)

20

35.

What is the charge on an Aluminium ion?

a)

3

b)

+3

c)

+2

d)

+1

36.

Ionic bonds form between metals and ____.

a)

metalloids

b)

metals

c)

nonmetals

37.

A(n) _________ is an ion with a positive (+) charge.

a)

anion

b)

cation

c)

ion

d)

solute

38.

How many O's are in Al₂(SO₄)₃

a)

4

b)

12

c)

7

d)

24

39.

In a chemical reaction, according to the Law of Conservation of mass, mass is not created nor destroyed. This means that.....

a)

The mass of the reactants stays the same before and after the reaction has occurred.

b)

The mass of the products stay the same before and after the reaction has occurred,

c)

The mass of the products is doubled the mass of the reactants.

d)

The mass before and after the reaction is the same.

40.

How many N atoms are in the formula: Pb(NO₃)₂?

a)

1

b)

2

c)

3

d)

5

41.

How many total atoms are in the formula: MgSO₄?

a)

1

b)

2

c)

4

d)

6

42.

How many S atoms are in the formula: MgSO₄?

a)

1

b)

2

c)

4

d)

5

43.

How many total atoms are in the formula: Pb(NO₃)₂?

a)

9

b)

8

c)

7

d)

5

44.

How many O atoms are in the formula: Pb(NO₃)₂?

a)

2

b)

3

c)

5

d)

6

45.

What are the total number of atoms in this formula? H₂ O₂

a)

3

b)

4

c)

2

Chemical Formulas and Atom Counts Review

Total questions: 45

Worksheet time: 2hrs 30mins

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