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Worksheets

Writing Chemical Formulae and Equations

Total questions: 45

Worksheet time: 45mins

Name
Class
Date
1.

What is the chemical formula of the compound formed between the ions Ba2+ and Br-?

a)
BrBa
b)
Br2Ba2
c)
BaBr2
d)
Br2Ba
2.

What is the chemical formula of the compound formed between the ions Ca2+ and O2-?

a)
CaO
b)
OCa
c)
Ca-2O+2
d)
Ca2O2
3.

What is the chemical formula of the compound formed between the ions K+ and O2-?

a)
KO
b)
K2O
c)
K-2O2
d)
O2K
4.

What is the chemical formula of the compound formed between the ions Ca2+ and P3-?

a)
PCa
b)
P2Ca3
c)
CaP
d)
Ca3P2
5.

What is the correct chemical name for MgI₂?

a)
Manganese IV iodide
b)
Manganese diiodide
c)
Magnesium iodide
d)
Magnesium diiodide
6.

What is the correct chemical formula for phosphorous trichloride?

a)
P₃Cl
b)
PCl₃
c)
KCl₃
d)
K₃Cl
7.

What is the chemical formula of the compound formed between the ions Zn2+ and S2- ?

a)

ZnS

b)

Zn2S2

c)

zinc sulfide

8.

What is the chemical formula of the compound formed by the ions Na+ and Cl- ?

a)

Na2Cl4

b)

NaCl

c)

Sodium chloride

9.

What is the chemical formula of the compound formed between the ions K+ and S2- ?

a)

Potassium sulfide

b)

KS

c)

K2S

10.

What is the chemical formula for the compound formed between the ions Mn2+ and Br- ?

a)

MnBr2

b)

Manganese bromide

c)

MnBr

11.

What is the chemical formula of the compound formed between the ions Fe3+ and O2- ?

a)

Iron oxide

b)

FeO

c)

Fe2O3

12.

What is the correct chemical name of the compound BaF2?

a)

Barium (II) fluoride

b)

Barium fluorine

c)

Barium fluoride

d)

Barium difluoride

13.
What do atoms of metals tend to do with their valence electrons when bonding with non-metals?
a)
share them
b)
donate them
c)
keep them and accept others
d)
keep them and give others
14.

What is the correct term for "an atom with more protons than electrons"?

a)
positive ion (cation)
b)
negative ion (anion)
c)
neutral atom
d)
stable atom
15.

What is the correct term for "an atom with more electrons than protons"?

a)
positive ion (cation)
b)
negative ion (anion)
c)
neutral atom
d)
stable atom
16.

What is the correct term for "an atom with a full valence shell"?

a)
positive ion (cation)
b)
negative ion (anion)
c)
neutral atom
d)
stable atom
17.

Carbon has four electrons in its valence shell. How many more electrons does carbon need to have a full valence shell?

a)
2 more
b)
4 more
c)
8 more
d)

0 more; it is already full

18.

Ca2+ combined with SO42- will form CaSO4, with a molecular ratio of _________.

a)

1:1

b)

1:2

c)

1:4

d)

2:2

19.

What chemical will be formed from the combination of a hydrogen ion (H+) and a hydroxide ion (OH-)?

a)

Hydrogen Peroxide

b)

Table Salt

c)

Table Sugar

d)

Water

20.

What is the chemical formula of solid carbon dioxide, more commonly known as dry ice?

a)

CO

b)

CO2

c)

CO3

d)

CH4

21.

A word equation ______.

a)

are detailed

b)

includes subscripts

c)

includes coefficients

d)

uses the full names of the substances

22.

True or False?

Word equations provide the amount of each substance in the reaction.

a)

True

b)

False

23.

What is the law of conservation of matter?

a)

chemical reactions create new atoms

b)

atoms cannot be created or destroyed

c)

reactants vanish once a reaction takes place

d)

products appear when a reaction takes place

24.

The number of atoms on each side of a chemical equation are ______.

a)

different

b)

the same

25.

How many iron atoms and how many oxygen atoms are there?

a)

Fe = 1; O = 2

b)

Fe = 2; O = 3

c)

Fe = 2; O = 1

d)

Fe = 1; O = 3

26.

How many hydrogen atoms and how many chlorine atoms are there?

a)

H = 4; Cl = 1

b)

H = 4; Cl = 0

c)

H = 4; Cl = 3

d)

H = 4; Cl = 4

27.

How many molecules are there in 3H2SO4?

a)

3

b)

6

c)

12

d)

18

28.

How many atoms of oxygen are represented in 2KNO3?

a)

2

b)

3

c)

5

d)

6

29.

How many aluminum atoms are there in Al2O3?

a)
3
b)
2
c)
5
30.

What do we call an atom that has lost or gained electrons, i.e. an atom with a charge?

a)
cation
b)
anion
c)
isotope
d)
ion
31.

What is the correct formula for the compound lithium oxide?

a)
LiO
b)
Li2O
c)
LiO2
d)
Li2O2
32.

Which equation is balanced?

a)

PbO2 + 2H2

b)

SO2 + H20 →\rightarrow H2SO4

c)

2Na + 2H2O →\rightarrow 2NaOH + H2

33.

How many HCl molecules do you need to balance this equation? 
Mg +  _HCl →\rightarrow MgCl2 + H2

a)
1
b)
2
c)
3
d)
4
34.

What is the total number of atoms present in 5Na3PO4?

a)
5
b)
40
c)
55
d)
8
35.

Balance this equation.

_Al + _HCl →\rightarrow _H2 + _AlCl3

a)

2; 6; 3; 2

b)

it's already balanced

c)

4; 12; 3; 4

d)

2; 1; 4; 5

36.

What are the coefficients that would balance this equation?

_Ca + _H2O →\rightarrow _Ca(OH)2 + _H2

a)

2; 1; 2; 1

b)

1; 2; 1; 1

c)

1; 2; 2; 4

d)

1; 2; 2; 1

37.

What are the coefficients that would balance this equation?

_H2 + _S →\rightarrow _H2S

a)

1; 1; 1

b)

2; 2; 2

c)

1; 2; 1

d)

1; 2; 2

38.

Determine the coefficients to balance the equation .

_N2 + _O2 →\rightarrow _NO

a)

1; 1; 1

b)

1; 1; 2

c)

2; 2; 2

d)

1; 2; 2

39.

Balance the the following equation.

_Zn + _HCl →\rightarrow _ZnCl2 + _H2

a)

1; 1; 2; 1

b)

1; 1; 1; 2

c)

1; 2; 1; 1

d)

2; 1; 1; 1

40.

Which is the coefficient for HNO3?
Mn + _HNO3 →\rightarrow Mn(NO3)2 + H2

a)
1
b)
2
c)
3
d)
0
41.

Which is the coefficient for NaOH?
Al(NO3)3 + _NaOH →\rightarrow Al(OH)3 + 3NaNO3

a)
1
b)
2
c)
3
d)
0
42.

What is the right side of a chemical equation called?

2H2 + O2 →\rightarrow 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

43.

What is the left side of a chemical equation called?

2H2 + O2 →\rightarrow 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical equation

44.

What is the number after an element in a chemical equation called?

For example: the "2" in H2.

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

45.

What is the chemical formula of copper(II) oxide?

a)

CUO

b)

CuO

c)

CuO2

d)

Cu2O

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