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Counting Atoms and Balancing Equations

Total questions: 40

Worksheet time: 2hrs 10mins

Name
Class
Date
1.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
2.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
3.
2H2 + O2 ----> 2H2O What is the product?
a)
------>
b)
2H2O
c)
2H2+ O2
4.
How many O's are in Al₂(SO₄)₃
a)
4
b)
12
c)
7
d)
24
5.
Number of N in (NH₄)₂CrO₄
a)
1
b)
2
c)
8
d)
16
6.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
7.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
8.
The law of conservation of matter states that
a)
chemical reactions change matter.
b)
in chemical reactions, the identity of reactants and products is conserved.
c)
atoms are neither created nor destroyed in chemical reactions.
d)
a chemical equation must be balanced.
9.
Why is the following chemical equation not balanced?
H2 + O2 --> H2O
a)
each side of the equation has a different number of oxygen atoms
b)
each side of the equation has a different number of hydrogen atoms
c)
each side has the same mass
10.

Which of the following is an unbalanced equation?

a)

CaCO3 --> CaO + CO2

b)

PbO2 + 2H2-->2Pb + H2O

c)

2Na+ 2H2O-->2NaOH + H2

d)

CS2 + 3O2 --> CO2 + 2SO2

11.
What is the part of the chemical equation in green called? 
Fe + S --> FeS
a)
products
b)
reactants
c)
yield
d)
chemical formula
12.
Balance this equation:
 2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
13.
Balance this equation:
MgCl2 --> Mg4+ Cl2
a)
It's already balanced.
b)
4MgCl2 --> Mg4+ 4Cl2
c)
4MgCl2 --> Mg4+ 5Cl2
14.
Name the part in red:

_2_H2 + _1_O2 -> _2_H2O
a)
Coefficient
b)
Product
c)
Yield
d)
Subscript
15.
Name the part in red:

H2 + O2 -> H2O
a)
Coefficient
b)
Product
c)
Reactant
d)
Subscript
16.
How many phosphorus atoms are in PO4?
a)
1
b)
2
c)
3
d)
4
17.
Which number should go in the blank?
_ H2 + O2 -> 2 H2O
a)
1
b)
2
c)
3
d)
0
18.
What are the coefficient used to balance the equation below?
__Ag2O →__ Ag +___O2
a)
2,4,1
b)
1,1,1
c)
2,1,2
d)
2,2,2
19.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
20.
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
21.

Which of the following is an acid?

a)

H2O

b)

NaOH

c)

H2SO4

22.

Which of the following is a base?

a)

H2O

b)

NaOH

c)

H2SO4

23.

Which of the following is a compound?

a)

Cl2

b)

NH3

c)

O2

24.

Which of the following is an element?

a)

Cl2

b)

NH3

c)

CO2

25.

Is this a balanced equation? Zn + H2SO4 --> ZnSO4 + H2

a)

Yes

b)

No

c)

I don't know

26.

Identify the reactant in this equation.

Zn + H2SO4 --> ZnSO4 + H2

a)

Zn

b)

H2

c)

ZnSO4

27.

Identify the product in this equation.

Zn + H2SO4 --> ZnSO4 + H2

a)

Zn

b)

H2SO4

c)

ZnSO4

28.

How many atoms of S (Sulfur) are in this?

Zn+ H2SO4

a)

1

b)

2

c)

4

29.

Identify the elements in this equation.

Zn + H2SO4 --> ZnSO4 + H2

a)

Zn + H2SO4

b)

H2 + Zn

c)

ZnSO4 + H2

30.

Is this equation balanced?

Na2S + 2HCl --> 2NaCl + H2S

a)

Yes

b)

No

c)

I don't know

31.

How many Pb atoms in the chemical compound?

2Pb(NO3)2

a)

2

b)

4

c)

12

d)

6

32.

How many N atoms in the chemical compound?

2Pb(NO3)2

a)

2

b)

4

c)

12

d)

6

33.

How many O atoms in the chemical compound?

2Pb(NO3)2

a)

2

b)

4

c)

6

d)

12

34.

How many Al atoms in the compound?

2Al2(SO3)3

a)

2

b)

4

c)

9

d)

18

35.

How many S atoms in the compound?

2Al2(SO3)3

a)

2

b)

4

c)

6

d)

12

36.

How many O atoms in the compound?

2Al2(SO3)3

a)

3

b)

6

c)

9

d)

18

37.

What coefficients balance this equation?

__PbF2 + __ H2SO4 --> ___PbSO4 + ___HF

a)

1, 1, 1, 1

b)

2, 1, 2, 1

c)

2, 1, 1, 1

d)

1, 1, 1, 2

38.

___ CH4 + ___ Br2 --> ___ CBr4 + ____ H2

a)

1, 1, 1, 1

b)

1, 2, 1, 2

c)

2, 1, 2, 1

d)

2, 2, 2, 2

39.

What coefficients make this equation balanced?

___ SiH4 + ___ LiOH --> ___ Si(OH)4 + ___ LiH

a)

1, 1, 1, 1

b)

1, 4, 1, 4

c)

4,1, 1, 4

d)

1, 4, 4, 1

40.

What coefficients balance the equation?

___ Al(OH)3 + ___ Cs --> ___ CsOH + ___ Al

a)

3, 3, 3, 3

b)

1, 1, 1, 1

c)

1, 3, 1, 3

d)

1, 3, 3, 1

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