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PS Unit 5:Balancing and Reactions

Total questions: 37

Worksheet time: 52mins

Name
Class
Date
1.

Which type of reaction can be expressed using the generic formula:

xy --> x + y

a)

decomposition

b)

single replacement

c)

double displacement

d)

combustion

2.
Which type of reaction can be expressed using the generic formula:
  ax+ by --> bx + ay
a)
double displacement
b)
single displacement
c)
combustion
d)
synthesis
3.
Which type of reaction can be expressed using the generic formula:
  ax+ y --> x + ay
a)
double replacement
b)
single replacement
c)
combustion
d)
decomposition
4.
The number in front of each compound in a chemical equation  _____. 
a)
Only applies to the first element in the compound
b)
should be a whole number
c)
Can be a fraction
d)
Can be a decimal
5.
 Which type of reaction always produces water? 
a)
 Double displacement
b)
Single Displacement 
c)
synthesis 
d)
Combustion
6.
All chemical reactions should be balanced _______. 
a)
Because when compounds change and form new compounds energy is released. 
b)
Because the product mass should always be more than the reactant mass when a precipitant is formed.
c)
 Because the starting mass  should always be more than the ending mass when a gas is produced 
d)
So that it will not defy the Law of Conversation of Mass
7.
Ammonium nitrate breaks down to form dinitrogen monoxide and water is an example of what type of reaction? 
a)
Double displacement
b)
Single Displacement 
c)
 synthesis 
d)
Decomposition
8.
Aluminum chloride is formed when Aluminum is exposed to chlorine gas. What type of reaction is this an example of?
a)
 No reaction
b)
Single Displacement 
c)
synthesis 
d)
Combustion
9.
When the equation AlCl3 + Na2S --> Al2S3 + NaCl is balanced, the coefficients are 
a)
2,3,2,3
b)
4,6,3,2
c)
1,1,1,1
d)
2,3,1,6
10.
When balancing a chemical equation you should _______.  
a)
Make sure the coefficients for each compound is the same on both sides of the equation
b)
Make sure the number of each element is the same for both sides of the equation.
c)
 Make sure the subscript for each element is the same on both sides of the equation. 
d)
Make sure the superscript for each element is the same on both sides of the equation.
11.

What type of reaction is this:

4 Si + S8 --> 2 Si2S4

a)

Synthesis (combination)

b)

Decomposition

c)

Single replacement

d)

Double replacement

12.
This reaction is considered:
3 KOH + H3PO4 --> K3PO4 + 3 H2O
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
13.
This reaction is considered:
3Ca + 2AlCl3 --> 3CaCl2 + 2Al
a)
synthesis
b)
Decomposition
c)
Single replacement
d)
Double replacement
14.
This reaction is considered:
3Mg + N2 --> Mg3N2
a)
synthesis
b)
Decomposition
c)
Single replacement
d)
Combustion
15.
What does the (aq) stand for in NaCl (aq)?
a)
solid
b)
aqueous 
c)
liquid
d)
gas
16.
Which type of chemical reaction breaks down into 2 different substances?
a)
Double Replacement
b)
Single Replacement
c)
Combination
d)
Decomposition
17.

Which chemical reaction switches 2 elements in two different compounds?

a)

Double Replacement

b)

Single Replacement

c)

Combustion

d)

Decomposition

18.
Which chemical reaction takes place when 2 substances react to form a single product?
a)
Decomposition
b)
Double Replacement
c)
Single Replacement
d)
Synthesis
19.
What goes in the missing blanks?
SnO2 + __ H2 → Sn + __ H2O
a)
5, 3
b)
1, 3
c)
3, 2
d)
2, 2
20.
When balancing equations what does
 --> ( an arrow) mean?
a)
subscript
b)
equals
c)
it is just an arrow
d)
yield
21.
Which type of reaction can be expressed using the generic formula:
  x+ y --> xy
a)
Synthesis
b)
decomposition
c)
single Replacement
d)
double displacement
22.
Which of the following is NOT considered evidence that a chemical reaction took place? 
a)
Light is produced
b)
heat is absorbed
c)
a distinct smell occurs
d)
change in state of matter
23.
Which of the following elements is not diatomic? 
a)
C
b)
N
c)
O
d)
F
24.
Ammonium nitrate breaks down to form dinitrogen monoxide and water is an example of what type of reaction? 
a)
Double displacement 
b)
Single Displacement 
c)
synthesis 
d)
Decomposition 
25.
Aluminum chloride is formed when Aluminum is exposed to chlorine gas. What type of reaction is this an example of? 
a)
Single Displacement
b)
synthesis
c)
 Decomposition 
d)
Combustion
26.
When the equation
AlCl3 + Na2S --> Al2S3 + NaCl
is balanced, the coefficients are 
a)
2,3,1,6
b)
2,1,3,2
c)
 1,1,1,1
d)
4,6,3,2
27.
What is the purpose for distinguishing different types of reaction? 
a)
because scientist use the types of reactions to determine what the reactants would be
b)
 because scientist use the types of reactions to determine what the possible products will be
c)
 because scientist use the type of reactions to determine how much of a reactant they need
d)
because all reactions fit into one of the five types of reactions 
28.

Please write the coefficients for substances in the following equation.

NaBr + H3P --> Na3P + HBr

a)

3, 1, 1, 3

b)

1, 1, 1, 1

c)

1, 3, 1, 2

d)

1, 2, 3, 3

29.

Please write the type of reaction for the following equations.

3NaBr + H3P --> Na3P + 3HBr

a)

synthesis

b)

decomposition

c)

single displacement

d)

double displacement

e)

combustion

30.

Please write the type of reaction for the following equations.

4Al + 3O2--> 2Al2O3

a)

synthesis

b)

decomposition

c)

single displacement

d)

Double displacement

e)

combustion

31.

Please write the type of reaction for the following equations.

2K2O --> 4K + O2

a)

synthesis

b)

decomposition

c)

single displacement

d)

double displacement

e)

combustion

32.

Which is a products in the following equations.

3NaBr + H3P --> Na3P + 3HBr

a)

H3P

b)

HBr

33.

Which is a reactant in the following equations.

3NaBr + H3P --> Na3P + 3HBr

a)

NaBr

b)

Na3P

34.

How many Al atoms are in the following equations.

2Al + 3Cl2 --> 2AlCl3

a)

1

b)

2

c)

3

35.

How many Cl atoms are in the following equations.

2Al + 3Cl2 --> 2AlCl3

a)

2

b)

3

c)

4

d)

6

36.

Based on the law of conservation of mass, Aluminum has four atoms on each side of the reaction


2Al + 3S --> Al2S3

a)

True

b)

False

37.

Based on the law of conservation of mass, the mass of the reactants will always equal the mass of the products.

a)

True

b)

False

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