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Chemical REactions Review

Total questions: 51

Worksheet time: 50mins

Name
Class
Date
1.

How does heat speed up a chemical reaction?

a)

Makes the molecules move slower and collide less

b)

Makes the molecules spin around

c)

Makes the molecules move faster and collide more

d)

Makes the molecules warm and happy

2.

An endothermic reaction

a)

Absorbs heat from the reaction and makes the temperature go down

b)

Releases heat into the reaction and makes the temperature go up

3.

An exothermic reaction

a)

Absorbs heat from the reaction and makes the temperature go down

b)

Releases heat into the reaction and makes the temperature go up

4.

The products of a chemical reaction are on the

a)

Left side (Products → Reactants)

b)

Right side (Reactants → Products)

5.

The reactants of a reaction are on the

a)

Left side (Reactants → Products)

b)

Right side (Products → Reactants)

6.

The law of conservation of mass states that

a)

The mass of a system (reaction) increases from beginning to end

b)

The mass of a system (reaction) stays the same from beginning to end

c)

The mass of a system (reaction) decreases from beginning to end

7.

Is this equation balanced? 
(Are there the same amount of H and O atoms on both sides of the equation?)

   H2O2→ H2O + O2H_2O_2\rightarrow\ H_2O\ +\ O_2  

a)

Yes

b)

No

8.

In the diagram, letter D represents a

a)

subscript

b)

coefficient

c)

product

d)

equation

9.

In the diagram, letter E represents a

a)

subscript

b)

coefficient

c)

product

d)

equation

10.
Which are the reactants in the equation shown?
a)
H2O and CO2
b)
O2 and CH4
11.

Which is the product in the reaction shown?

a)

Al2O3

b)

Al

c)

O2

12.

How does the mass of products compare to the mass of reactants in a chemical reaction?

a)

reactants = products

b)

reactants > products

c)

reactants < products

13.

In the reaction shown below, 12 grams of AB break down into 8 grams of product A and an unknown amount of product B.


Using the law of conservation of mass, what will the mass of product B be?

a)

4 grams

b)

8 grams

c)

12 grams

d)

20 grams

14.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
15.
How many elements are in C6H12O6?
a)
1
b)
3
c)
12
d)
24
16.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
17.

The law of conservation of mass can be demonstrated by a chemical reaction. Which of the following models of a chemical reaction best represents the law of conservation of mass?

a)
b)
c)
d)
18.

Choose the correct coefficients that balance the following equation.

Ca + N2 --->Ca3N2

a)

1,3,3

b)

2,3,1

c)

3,1,1

d)

4,1,3

19.

What type of reaction is occuring?

2 FeCl3 --> 2 Fe + 3 Cl2

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

20.

The type of reaction in which oxygen is a reactant and energy is produced is called ________.

a)

synthesis

b)

decomposition

c)

single replacement

d)

combustion

21.

What type of reaction

is occurring?

Al + 3 Ag(NO3)--> 3 Ag + Al(NO3)3

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

22.

Select the coefficients to balance the following equation.

___Al + ___Ag(NO3) --> __Ag + __Al(NO3)3

a)

3,1,1,3

b)

1,3,3,1

c)

1,2,2,1

d)

2,1,1,2

23.

What type(s) of reaction is occurring?


4 Fe + 3 O2 --> 2 Fe2O3

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

24.

What type of reaction is occuring?

FeCl2 + CaBr2 --> CaCl2 + FeBr2

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

25.

Balance the following equation.

Al + S--> Al2S3

a)

2,2,1

b)

2,4,1

c)

2,3,1

d)

3,1,1

26.

Physical or Chemical Change: Folding Paper

a)

physical

b)

chemical

27.

Physical or Chemical Change: Crushing a can

a)

physical

b)

chemical

28.

Physical or Chemical Change: Rotting apple

a)

physical

b)

chemical

29.

Anything that has mass and takes up space

a)

Matter

b)

Atom

c)

Molecule

d)

Crystal

30.

the process by which one or more substances change to produce one or more different substances

a)

Chemical Property

b)

Physical Property

c)

Chemical Reaction

d)

Precipitate

31.
The rate of a chemical reaction is NOT affected by which of the following:
a)
temperature
b)
concentration
c)
particle size (surface area)
d)
All of these affect reaction rates
32.
The rate of a reaction increases as temperature__________________.
a)
Decreases
b)
Increases
c)
Stays the Same
33.
Products will form faster if____________
a)
the particle size of the reactants are larger.
b)
temperature is decreased.
c)
concentration of the reactants are increased.
d)
the reaction is not stirred.
34.
A scientist combines chemicals and produces an exothermic reaction. What byproduct of this reaction would show that it is exothermic?
a)
heat
b)
coolness
c)
a precipitate
d)
gas bubbles
35.

In which type of reaction do ions in two compounds switch places?

a)

synthesis

b)

decomposition

c)

single replacement

d)

double replacement

36.

A chemical reaction in which energy is absorbed is ______________.

a)

an endothermic reaction

b)

an exothermic reaction

c)

a single replacement reaction

d)

a double replacement reaction

37.

Which of the following chemical reactions illustrates a decomposition reaction?

a)

4H2 + 2O2 --> 2H2O

b)

2H2O --> 2H2 + O2

c)

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

d)

4KI + 2Cl2 --> 4KCl + 2I2

38.

Which of the following chemical equations is balanced?

a)

Ca + 2O2 --> 2CaO2

b)

3Ca + O2 --> 3CaO2

c)

3Ca + 2O2 --> 5CaO2

d)

Ca + O2 --> CaO2

39.

Which of the following would react fastest in sweet tea?

a)

a sugar cube

b)

a sugar cube cut in half

c)

a sugar cube cut in fourths

d)

a sugar cube crushed into powder

40.

The minimum amount of energy needed for substances to react is called__________.

a)

Activation Energy

b)

Catalyst Energy

c)

Endothermic Energy

d)

Exothermic Energy

41.
The Law of Conservation of Mass states
a)
that matter exists in all states and reacts the same
b)
that matter can only be changed into new substances by introducing a catalyst
c)
that matter exists in the same state throughout any chemical change
d)
that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants
42.
How many Al atoms are in this compound?         4Al2O3
a)
2
b)
8
c)
6
d)
4
43.
How many F atoms are in this compound?
6MgF2 
a)
2
b)
6
c)
8
d)
12
44.
An gel ice pack getting cold after you put it in the freezer for an hour.
a)
Chemical Change
b)
Physical Change
45.

Why are chemical equations always balanced? Select ALL that apply.

a)

Matter cannot be created.

b)

Matter cannot be destroyed.

c)

Matter can only be rearranged/conserved.

d)

Matter doesn't matter.

46.

In a chemical reaction, if the reactants are heated, the reaction usually happens

a)

slower

b)

faster

c)

at the same rate

d)

in a smaller volume

47.

Which of the following is a common sign that a chemical change has occurred?

a)

A chemical has turned a different color, bubbled, and/or changed temperature.

b)

A chemical has changed to a different state of matter, such as a liquid to a solid.

c)

A chemical has changed size.

d)

A chemical has become a different shape.

48.
Which of the following options correctly balances the equation below?
__HNO2 + __O2 --> __HNO3
a)
4, 1, 4
b)
1, 2, 1
c)
1, 2, 1
d)
2, 1, 2
49.
What is the term for the → sign in a reaction?
a)
makes
b)
produces
c)
yields
d)
all are correct
50.
Which set of coefficients properly balances the reaction below?
_Cu + _H2O →_ CuO3 + _H2
a)
1,3,1,5
b)
2,6,2,6
c)
1,3,1,3
d)
1,2,3,4
51.
What are the correct coefficients to balance the reaction below?
_BaO + _K3N → _Ba3N2 + _K2O
a)
3,2,1,2
b)
3,3,1,3
c)
3,2,1,3
d)
3,1,2,3

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