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Balancing Equations

Total questions: 28

Worksheet time: 31mins

Name
Class
Date
1.

Select all answers that would balance this equation.

a)

Change N2N_2  to  2N22N_2  

b)

Change  H2 to 3H2H_2\ to\ 3H_2  

c)

Change  H2 to H6H_2\ to\ H_6  

d)

Change  NH3 to 2NH3NH_3\ to\ 2NH_3  

2.

Which chemicals are the reactants in this equation?

a)

NH3 and O2NH_3\ and\ O_2

b)

O2 and H2OO_2\ and\ H_2O

c)

N2 and H2ON_2\ and\ H_2O

d)

NH3 and N2NH_3\ and\ N_2

3.

Choose all that apply.

a)

Chemicals before the reactions starts.

b)

Chemicals after the reactions ends.

c)

Chemicals on the left of the arrow.

d)

Chemicals on the right of the arrow.

4.
a)

yes

b)

no

5.

Is this equation balanced?

PCl5 + 4H2O → 5HCl + H3PO4

a)

yes

b)

no

6.

Which side of a chemical equation is the reactants side?

a)

Left (before the yields sign)

b)

Right (after the yields sign)

7.
Which problem is balanced?
a)
PbO2 + 2H2--> H2SO4
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
d)
2Na + 2H2O --> 2NaOH + H
8.
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.
9.

Is this equation balanced?

Mg + Cl2 --> MgCl2

a)

no

b)

yes

10.

Is this equation balanced?

N2 + 3H2 --> 2NH3

a)

no

b)

yes

11.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
12.
The blue numbers in the image below represent ________
a)
Charges
b)
coefficients
c)
subscripts
d)
none of the answers are correct
13.

Which equation is balanced?

a)

3 P4+ O2 --> 2 P2O3

b)

P4+ O2 --> 2 P2O3

c)

P4+ 3 O2 --> 2 P2O3

d)

P4+ 2 O2 --> 3 P2O3

14.
At the end of chemical reactions, what is the total mass of the reactants compared to the total mass of the products?
a)
the product is doubled
b)
the product is half the mass of the reactants
c)
the mass is the same
d)
the mass changes depending on the reaction
15.

Which equation is balanced?

a)

3Al2O3--> 2Al+O2

b)

2Al2O3 --> 2Al+3O2

c)

2Al2O3--> 4Al+3O2

16.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
17.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
18.
Is this balanced?...
Fe + S --> FeS
a)
YES!
b)
NO!
19.
Is this equation balanced?
a)
yes
b)
no
c)
Not enough information
d)
Left side is balanced
20.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
21.

Which of these is a correct way to draw a dot diagram?

a)
b)
22.

What are valence electrons?

a)

The total number of electrons in an atom

b)

The number of electrons in the outermost shell

c)

The number of electrons in the second shell

d)

The number of protons in the outermost shell

23.
How do positive ions form?
a)
by gaining electrons
b)
getting compliments
c)
by losing electrons
d)
gaining more protons
24.

Which of the following is the correct electron-dot diagram for an atom with an electron configuration of 2-8-5?

a)
b)
c)
d)
25.

How many dots would you put around carbon, a group 14 element?

a)

4

b)

6

c)

8

d)

18

26.

How many electrons does the first shell hold?

a)

1

b)

2

c)

4

d)

8

27.

How many electrons does the 2nd energy level hold?

a)

1

b)

2

c)

4

d)

8

28.

If both protons and neutrons are found in the nucleus, why is it positive?

a)

The reason it is positive is because neutrons have a positive charge and protons have a negative charge.

b)

The reason it is positive is because neutrons have a negative charge and protons have a positive charge

c)

The reason it is positive is because neutrons have no charge and protons have a positive charge.

d)

The reason it is positive is because neutrons have no charge and protons have a negative charge

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