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Balancing Reactions Quiz

Total questions: 20

Worksheet time: 31mins

Name
Class
Date
1.

2 NaCl  ..... Na + Cl22\ NaCl\ →\ .....\ Na\ +\ Cl_2  

What coefficient will go in front of the Na to balance this equation?

a)

1

b)

2

c)

3

d)

4

2.

AcF3 +..... Li  Ac + 3 LiFAcF_3\ +.....\ Li\ →\ Ac\ +\ 3\ LiF  

What coefficient will go in front of Li on the reactant side to balance this equation?

a)

1

b)

2

c)

3

d)

4

3.

What is the arrow in a chemical equation... H2 + O -->  H2O

a)

Reactants

b)

Products 

c)

Produces

d)

Chemical Equation 

4.

Balance this equation. _CH4 + _O--> _CO+ _H2O

(We know we usually don't write 1 when balancing and equation)

a)

1,2,1,1

b)

2,1,2,1

c)

1,2,1,2

d)

0,2,0,2

5.
What are the smaller numbers that you CANNOT change in a chemical equation? 
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
6.
What are the larger numbers that you CAN CHANGE in a chemical equation? 
a)
Coefficient 
b)
Products
c)
Reactants
d)
Subscripts
7.
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.
8.
The number of atoms you begin with in a chemical reaction ...
a)
must be the same as the number of  atoms you end with
b)
must be an even number
c)
can be different to the number you finish with
d)
changes depending on how much energy is formed
9.

In the compound Mg(NO3)2, how many atoms of oxygen is present?

a)

1

b)

2

c)

3

d)

6

10.

In the compound Mg(NO3)2, how many atoms of nitrogen is present?

a)

1

b)

2

c)

3

d)

6

11.

How many elements are in C6H12O6?

a)

1

b)

2

c)

3

d)

4

12.
In balancing chemical equations, we change
a)
Coefficients
b)
Subscripts
c)
Both can be changed
d)
None can be changed
13.

What does the notation (s) in this equation denote?

Zn (s) + 2 AgNO3 (aq) → Zn(NO3)2 (aq) + 2 Ag (s)

a)

Solid

b)

Sliced

c)

Simple equation

d)

single element

14.

How many atoms of H in the reactants?

HCl + NaOH --> NaCl + H2O

(a)  

15.

How many atoms of O in the reactants?

HCl + NaOH --> NaCl + H2O

(a)  

16.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O--> 2AlO3
a)
2
b)
6
c)
1
d)
4
17.
If reaction starts with 20g of reactants it should produce 
a)
a total of 40g of products
b)
a total of 10g of products
c)
a total of 80 g of products
d)
a total of 20g of products
18.

Which of the models of a chemical reaction best represents the Law of Conservation of Mass?

a)

A

b)

B

c)

C

d)

D

19.

How many atoms of Cl in the products?

HCl + NaOH --> NaCl + H2O

a)

1

b)

2

c)

3

d)

0

20.
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