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Unit 9 Reactions Review

Total questions: 54

Worksheet time: 56mins

Name
Class
Date
1.
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
2.
The red numbers in the image below represent ________
a)
subscripts
b)
coefficients
c)
I don't know, and don't want to try
d)
None of the answers are correct
3.
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
4.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
5.

What is the right part of a chemical equation called...

H2 + O2 --> H2O

a)

Reactants

b)

Products

c)

Yields

d)

Chemical Equation

6.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5
7.

PCl5 + ___ H2O → ___ HCl + H3PO4

a)

4, 5

b)

1, 6

c)

3, 8

d)

2,2

8.

__ Al + __ FeO → Al2O2 + __ Fe

a)

1, 1, 2

b)

2,1,2

c)

2, 2, 2

d)

2,4,2

9.
Balance this equation.
_SnO2 +_H2-->_Sn +_H2O
a)
1,1,2,1
b)
1,2,1,1
c)
1,2,1,2
d)
1,2,2,1
10.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
11.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
12.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
13.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
14.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
15.
Number of H in 3(NH₄)₂CrO₄
a)
4
b)
6
c)
8
d)
24
16.

Finish a balanced equation: Mg(OH)2 --> __________

a)

Mg(OH)2 --> MgOH

b)

Mg(OH)2 --> MgO+ H2O

c)

Mg(OH)2 --> MgO+ H2

d)

Mg(OH)2 --> Mg+ H2O

17.
Which of the following has the most number of O?
a)
2Mg3(PO4)2
b)
4AlPO4
c)
3Al(NO3)3
d)
15KOH
18.
What is the arrow in a chemical equation...
H2 + O --> H2O
a)

Reactants

b)

Products 

c)

Produces/Yields

d)

Chemical Equation

19.
AB + CD →AD + CB
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
20.

Identify this type of reaction, Cl2 + 2KI -->  I2 + 2KCl

a)

Synthesis

b)

Single replacement

c)

Double replacement

d)

Decomposition

21.
2 C5H5 + Fe --> Fe(C5H5)2 
a)

single replacement

b)

double replacement

c)

decomposition

d)

synthesis

22.
Which of the following is the general formula for a decomposition reaction?
a)
A + B  → AB
b)
AB → A + B
c)
AB + C → AC + B
d)
AB + CD → AC + BD
23.
Si + S8 --> Si2S4
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
24.
Ca + AlCl3 --> CaCl2 + Al
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Double replacement
25.
C3H8 + O2 --> H2O + CO2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
26.

The reaction XY --> X + Y is an example of _____.

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

27.

Which of the following is an example of a single replacement reaction?

a)

2NaF --> 2 Na + F2

b)

P2O5 + 3 H2O --> 2H3PO4

c)

2FeCl3 + 3Zn --> 2Fe + 3ZnCl2

d)

C6H12O6 + 6O2 --> 6CO2 + 6 H2O

28.

Which of the following chemical equations is an example of a double replacement reaction?

a)

2Al2O3 --> 4Al + 3O2

b)

2C5H10 + 15O2 --> 10CO2 + 10H2O

c)

2MgCl2 + Na2CO3 --> 2 NaCl + MgCO3

d)

K2O + H2O --> 2 KOH

29.

Which of the following chemical equations is an example of a combustion reaction?

a)

2Al2O3 --> 4Al + 3O2

b)

2C5H10 + 15O2 --> 10CO2 + 10H2O

c)

2MgCl2 + Na2CO3 --> 2 NaCl + MgCO3

d)

K2O + H2O --> 2 KOH

30.

What class of reaction best describes the equation below:

2HgClO3 ----> 2HgO + Cl2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

31.

Balance this equation.

_C4H10 + _O2 --> _CO2 + _H2O

a)

2,7,4,5

b)

1,7,4,5

c)

2,13,8,10

d)

1,2,1,2

32.

How does a catalyst work in speeding up a reaction?

a)

By lowering the activation energy of the reaction

b)

by giving them more energy

c)

by making them more available

33.

An _______ reaction is when more energy is released than is absorbed. This energy can be in the form of light, heat, electricity, etc.

a)

endothermic

b)

endergonic

c)

exothermic

d)

exergonic

34.

An _______ reaction is when more energy is absorbed than is released. This energy can be in the form of light, heat, electricity, etc.

a)

endothermic

b)

endergonic

c)

exothermic

d)

exergonic

35.

A student combines two clear, colorless solutions shown here. When combined, the temperature changed from 25°25\degree  to  23°23\degree  and a white substance rapidly formed and settled at the bottom of the container. What most likely happened to produce these results?

a)

One of the original compounds came out of solution

b)

The solutions reacted chemically

c)

Some of the water froze into ice crystals

d)

Rapid evaporation of water occured, leaving a solid

36.

Which of the following does NOT indicate a chemical reaction is occuring? Check all that apply.

a)

Unknown A dissolves into Unknown B

b)

Unknown A creates fizzing and bubbles when combined with Unknown B

c)

Unknown A sinks to the bottom when added to Unknown B

d)

Unknown A floats to the top when added to Unknown B

37.

Which scientific observation, shown in the chart, indicates that a chemical reaction has NOT occurred?

a)

Number 1

b)

Number 2

c)

Number 3

d)

Number 4

38.

Predict the products fo the following equation.

CuCl2 + H2S ---->

a)

CuS(s) + HCl(aq)

b)

Cu2S(s) + HCl(aq)

c)

No reaction

d)

HCu(s) + SCl(s)

39.

Predict the products of the following reaction.


H2SO4 + BaCl2 ---->

a)

BaSO4(s) + HCl(aq)

b)

BaSO4(aq) + HCl(s)

c)

No Reaction

d)

ClSO4(aq) + BaH(s)

40.

Predict the products of the following equation.

PbCl2 + AgNO3 ---->

a)

AgCl(s) + Pb(NO3)2(aq)

b)

No Reaction

c)

AgCl(aq) + Pb(NO3)2(s)

d)

AgPb(s) + ClNO3(aq)

41.

Which type of reaction can be a precipitate reaction?

a)

synthesis reaction

b)

single replacement reaction

c)

double replacement reaction

d)

combustion reaction

42.

Which of the following best describes a precipitate?

a)

solid powder that falls out of solution when a solid and liquid reactant combine in a synthesis reaction.

b)

solid powder that falls out of solution when two aqueous reactants combine in a double displacement reaction.

c)

solid powder that falls out of solution when aqueous and gaseous reactants combine in a single replacement reaction.

43.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
44.

In an endothermic reaction, heat is ...

a)

taken in

b)

given out

45.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
46.
Increase in temperature of the reactants can do one of the following
a)
Slow collision frequency
b)
Allow less effective collision between the particles
c)
Cause particles to lose speed
d)
Increase collision between the particles thus increasing the rate.
47.
Grinding a seltzer tablet into powder increases the rate of reaction due to increased
a)
concentration
b)
surface area
c)
temperature
d)
reactants
48.
Which factors increase the rate of a reaction.
a)
increasing temperature
b)
increasing concentration
c)
increasing surface area
d)
all of these
49.
A ______________ is a substance that increases the rate of a reaction without being used up during the reaction. 
a)
catalyst
b)
product
c)
reactant
d)
solute
50.
Increasing the concentration of the reactants will slow down the reaction.
a)
false 
b)
true
51.
Products will form faster if____________
a)

the surface area of the reactants are smaller.

b)
temperature is decreased.
c)
concentration of the reactants are increased.
d)
the reaction is not stirred.
52.

Which of the following would increase the number of collisions that occur? Choose all that appy.

a)

Increase Surface Area

b)

Decrease Concentration

c)

Increase Temperature

d)

Increase Volume

53.

How could we make this reaction happen more quickly?

a)

Decrease the concentration of the acid

b)

crush the chalk to increase the surface area

c)

Put the test tube in an ice bath

54.

In which container would you expect a higher reaction rate, and why? (Note: The number of particles is the same in both containers.)

a)

The left would have a higher reaction rate because it has a greater volume and more collisions will happen.

b)

The right would have a higher reaction rate because it has a greater volume and more collisions will happen.

c)

The left would have a higher reaction rate because it has a lesser volume and more collisions will happen.

d)

The right would have a higher reaction rate because it has a lesser volume and more collisions wil happen.

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