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Balancing Chemical Equations and Atomic Structure

Total questions: 50

Worksheet time: 1hrs 16mins

Name
Class
Date
1.

Which of the following chemical formulas are the reactants?

a)

CH4CH_4

b)

CH4  and  2O2CH_4\ \ and\ \ 2O_2

c)

CO2CO_2

d)

CO2  and 2H2OCO_2\ \ and\ 2H_2O

2.

Which of the following chemical formulas are the products?

a)

2O22O_2

b)

CH4 and 2O2CH_4\ and\ 2O_2

c)

CO2CO_2

d)

CO2 and 2H2OCO_2\ and\ 2H_2O

3.

_______________ are numbers used to balance chemical equations.

a)

subscripts

b)

coefficients

c)

reactants

d)

products

4.

How many hydrogen atoms are in the formula for glucose, C6H12O6 ?

a)

6

b)

12

c)

18

d)

24

5.

How many atoms of oxygen are in the chemical formula for sulfuric acid, H2SO4 ?

a)

1

b)

2

c)

3

d)

4

6.

How many atoms of oxygen are in the chemical formula for potassium carbonate?

2K2CO3

a)

2

b)

3

c)

4

d)

6

7.

How many atoms of hydrogen are on the reactant side of the balanced chemical listed below?

2H2O → 2H2 + O2

a)

1

b)

2

c)

3

d)

4

8.

How many atoms of oxygen are in the product side of the balanced chemical equation below?

H2SO4 + 2NaOH → 2H2O + Na2SO4

a)

2

b)

4

c)

6

d)

8

9.

What coefficients are needed to balance the following chemical equation?

__H2O → __H2 + __O2

a)

1, 1, 1

b)

2, 2, 2

c)

2, 2, 1

d)

2, 2, 3

10.

What coefficients are needed to balance the following chemical equation?

__Zn + __HCl → __ZnCl2 + __H2

a)

1,1,1,1

b)

1,2,1,1

c)

2,1,2,2

d)

2,1,2,1

11.

What coefficients are needed to balance the following chemical equation?

__Fe + __ AgNO3 → __ Ag + __ Fe(NO3)3

a)

1,1,1,1

b)

1,2,1,2

c)

1,3,3,1

d)

3,1,3,1

12.
What coefficient should be used to make the following equation balanced?
N2+O2--> _NO 
a)
1
b)
2
c)
3
d)
4
13.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
14.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
15.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
16.

LOOKING AT THE COEFFICIENT , TELL ME HOW MANY BROMINE ATOMS ARE LISTED: 12NaBr

a)

1

b)

0

c)

12

d)

24

17.
What is the Law of Conservation of Mass?
a)
It states that no matter can be created or destroyed.
b)
It states that no energy can be created or destroyed.
c)
It states that matter can be created or destroyed.
d)
It states that no sound can be created or destroyed.
18.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.
19.
What is the part of the chemical equation in green called? 
Fe + S --> FeS
a)
products
b)
reactants
c)
yield
d)
chemical formula
20.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
21.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
22.
Element or compound?
H2O
a)
element
b)
compound
23.

Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe

a)

yes

b)

no

24.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
25.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
26.
How many phosphorus atoms are in PO4?
a)
1
b)
2
c)
3
d)
4
27.

What is the arrow in a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactant

b)

Product

c)

Yields

28.

What is the total number of atoms present in Na3PO2

a)
5
b)

10

c)

4

d)

6

29.

Is this equation balanced?

  Mg2 + HCl --->  MgCl2 + H2

a)

Yes

b)

No

30.
Which number should go in the blank?
Al(NO3)3 + _  NaOH -> Al(OH)3 + 3 NaNO3
a)
1
b)
2
c)
3
d)
0
31.
Which number should go in the blank?
Mn + _ HNO3 → Mn(NO3)2 + H2
a)
1
b)
2
c)
3
d)
0
32.
Which number should go in the blank?
2 Na+ _ Cl2 -> 2 NaCl
a)
1
b)
2
c)
3
d)
0
33.
Which number should go in the blank?
_ H2 + O2 -> 2 H2O
a)
1
b)
2
c)
3
d)
0
34.
How many hydrogen atoms are in 2 H2?
a)
1
b)
2
c)
3
d)
4
35.
In balancing chemical equations, we change
a)
Coefficients
b)
Subscripts
c)
Both can be changed
d)
None can be changed
36.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
37.
CaCO3 represents a chemical
a)
Symbol
b)
Formula
c)
Subscript
d)
Reaction
38.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
39.

What law governs the balancing of chemical equations?

a)

Law of Energy

b)

Law of Conservation of Matter/Mass

c)

Law of Gravity

d)

Law of Matter Movement

40.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
41.

What is the charge of a proton?

a)

Negative

b)

Positive

c)

Neutral

42.

What is the charge of a neutron?

a)

Negative

b)

Positive

c)

Neutral

43.
An atom of the element with atomic number 6 always has _____.
a)
six protons in its nucleus
b)
an atomic mass of six
c)
more than six neutrons
d)
six electron clouds
44.
What are subatomic particles? 
a)
the nucleus 
b)
electron cloud
c)
positive charge
d)
electrons, protons, and neutrons
45.

In an atom, the number of protons is equal to the number of ____________.

a)

energy levels

b)

neutrons

c)

neurons

d)

electrons

46.

The smallest particle of an element.

a)

Element

b)

Molecule

c)

Atom

47.

Subatomic particles with a negative charge

a)

Electrons

b)

Neutrons

c)

Protons

d)

Quarks

48.
Which letter represents the nucleus?
a)
A
b)
B
c)
D
d)
E
49.
All matter is made of what?
a)
energy 
b)
atoms 
c)
volume
d)
compounds 
50.

What does the nucleus of an atom contain?

a)

Electrons and neutrons

b)

Protons and neutrons

c)

Neutrinos and positrons

d)

Electrons and megatrons

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