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Chemical Reactions

Total questions: 103

Worksheet time: 3hrs 39mins

Name
Class
Date
1.

Which of the following are signs of a chemical reaction?

a)

Formation of a gas

b)

A change in temperature

c)

A change in color

d)

A change in size

2.

In a chemical reaction, the number of atoms in the reactants and the products...

a)

Must be the same

b)

Must be different

3.

Which of these is NOT a sign of a chemical reaction?

a)

A phase change

b)

Formation of a precipitate

c)

A color change

d)

A temperature change

4.

When a chemical reaction occurs...

a)

New molecules and atoms are formed

b)

Molecules and atoms are rearranged

c)

Molecules and atoms disappear

d)

Molecules and atoms are destroyed

5.

Is the chemical equation here balanced?

a)

Yes

b)

No

6.

Imagine you have an unknown substance in your hand. You know that it has a mass of 100g and a volume of 10cm3. What is the density of this unknown substance?

a)

5g/cm3

b)

11g/cm3

c)

10g/cm3

d)

25g/cm3

7.

In a cup you have 50g of water. This means you have how many mL's of water?

Remember: water has a density of 1g/mL.

a)

10mL

b)

74mL

c)

100mL

d)

50mL

8.

A pure substance is made of how many different types of atoms/molecules?

a)

4

b)

3

c)

1

d)

2

9.

A mixture is made of at least how many different types of atoms/molecules?

a)

2

b)

1

c)

4

d)

7

10.

You have 2 chemicals, CHEMICAL A and CHEMICAL B. They are both liquids. When you combine them you notice some crystals starting to form within them. Did a chemical reaction occur?

a)

Yes

b)

No

11.

You have a large glass of water and you stir salt into it until all the salt completely dissolves. Is this a chemical reaction?

a)

Yes

b)

No

12.

This is the decomposition reaction of hydrogen peroxide. According to the law of conservation of mass, if you start with 40g of hydrogen peroxide you should end up with _____g of water and oxygen combined.

a)

10

b)

20

c)

30

d)

40

13.

You have a beaker full of water. If you add a solid substance to the beaker and the water level rises, is this a chemical reaction? Why or why not?

a)

Yes because it is a mixture now.

b)

No because there was no sign of a chemical reaction.

c)

Yes because the water moved.

d)

No because the temperature changed.

14.

Your pet rock has a density of 150g/cm3. You know it has a volume of 5cm3. What is its mass?

a)

800g

b)

750g

c)

5g

d)

1,000g

15.

Your dog has a mass of 2,000g and a volume of 500cm3. What is your dog's density?

a)

1g/cm3

b)

5g/cm3

c)

12g/cm3

d)

4g/cm3

16.

A substance that is formed as the result of a chemical reaction is a __________________

a)

Product

b)

Reactant

c)

Starters

d)

Enders

17.

A change in the shape of an object is an example of _________________.

a)

a chemical change

b)

energy

c)

an endothermic change

d)

a physical change

18.

Which one shows that a chemical reaction has occurred?

a)

dissolving

b)

melting

c)

formation of a gas

d)

bending

19.
In a ___________change, a substance changes into a different substance.
a)
Physical
b)
Chemical
20.

What is the BEST definition of a chemical reaction?

a)

A change in matter that produces one or more NEW substances

b)

When two things combine and EXPLODE.

21.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
22.

In the equation 2Mg+O2 → 2MgO2Mg+O_2\ \rightarrow\ 2MgO   which are the reactants?

a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
23.
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
a)
H3PO4
b)
H2SO4
c)
HCIO3
d)
H20
24.
Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
25.
A teacher is demonstrating physical and chemical changes to her class. Which action should she use to demonstrate a chemical change?
a)
cutting a piece of paper
b)
folding a piece of paper
c)
tearing a piece of paper
d)
burning a piece of paper
26.
Which of the following describes a precipitate?
a)
a liquid forms when a block of metal is heated
b)
a solid forms when one liquid is poured into another
c)
a gas forms when a solid is placed in a liquid
d)
bubbles form when an acid is poured on a rock
27.
A pure substance...
a)
is an element or a compound
b)
is an element or a mixture
c)
is a compound or a mixture
d)
is a mixture
28.

 A substance that cannot be broken down into any other substance by ordinary chemical means is called

a)
molecule
b)
mixture
c)
element
d)
compound
29.

NaHCO3 is an example of

a)
an abbreviation
b)
a compound
c)
a mixture
d)
an element
30.
What is an example of an element?
a)
Oxygen
b)
Pure water
c)
Air
d)
Table salt
31.

What are the products of the chemical reaction pictured?

a)

CH4 and CO2

b)

CH4 and O2

c)

CO2 and 2 H2O

d)

O2 and H2O

32.
Consider the chemical equation CH4 + 2 O2 → CO2 + 2 H2O. In this equation, CH4 is a
a)
product
b)
reactant
c)
displacement
33.
In a chemical reaction, bonds are broken and new bonds are formed that create new substances. The bonds that are broken are called what?
a)
Reactants
b)
Products
c)
Atoms
d)
Catalysts
34.
This is used to represent the number of each atom being represented. 
a)
A Exponent
b)
The Coefficient
c)
A Molecule
d)
The Subscript
35.
How many TOTAL atoms are on the REACTANT side of this equation?
CH4 + 2O2 → CO2 + 2H2O 
a)
5
b)
7
c)
9
d)
11
36.
Measure of the amount of matter 
a)
mass
b)
volume
c)
weight
d)
density
37.
Anthony is performing an experiment. He adds 0.25 grams of baking soda to 5 grams of water and stirs. Anthony watches as the baking soda dissolves in the water. If Anthony weighs the water and baking soda solution, what will its mass be?
a)
4.75 grams
b)
5.0 grams
c)
5.25 grams
d)
7.5 grams
38.

How many oxygen atoms are in the products for the chemical reaction below?
4Fe + 3O2 → 2Fe2O34Fe\ +\ 3O_{2\ }\rightarrow\ 2Fe_2O_3  

a)

2

b)

3

c)

5

d)

6

39.

The Law of Conservation of Mass says that matter can neither be __________ or __________.

a)

created; destroyed

b)

recycled; renewed

c)

subtracted; added

d)

joined; separated

40.

How many atoms are in the products below?
4Fe +3O2 → 2Fe2O34Fe\ +3O_{2\ }\rightarrow\ 2Fe_2O_3  

a)

7

b)

10

c)

17

d)

20

41.
Substances present at the start of a chemical reaction
a)
subscripts
b)
coefficients
c)
reactants
d)
products
42.
Is this equation balanced or unbalanced? 
H2 + O2 --> H2O
a)
balanced
b)
unbalanced
43.

Two substances combine into 1 substance.

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

44.

One substance breaks down into two or more substances.

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

45.

One element trades places with another element in a compound.

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

46.

When the positive ion of one compound replaces the positive ion of another compound to form two new compounds.

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

47.

A + B --> AB

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

48.

AB --> A + B

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

49.

A + BC --> B + AC

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

50.

AB + CD --> CB + AD

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

51.

C + H2 --> CH4

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

52.

Ni(ClO3)2 --> NiCl2 + O2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

53.

Cl2 + KI --> KCl + I2

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

54.

HCl + NaOH --> NaCl + H2O

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

55.

Matter and mass can not be

a)

Shaken or stirred

b)

Made

c)

created or destroyed

d)

Transferred

56.

Which type of reaction has only one reactant?

a)

synthesis

b)

Double replacement

c)

Chemical reaction

d)

decomposition

57.

4Si + S8 --> 2Si2S4


What type of reaction is this?

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Double displacement

58.

3Mg + N2 --> Mg3N2


What type of reaction is this?

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

59.

What type of reaction is this?

P4 + 3O2 --> 2P2O3

a)

Synthesis

b)

Decomposition

c)

Single displacement

d)

Combustion

60.
Which chemical reaction breaks down into 2 substances?
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
61.
A + B = AB
a)
Double Replacement
b)
Synthesis
c)
Combustion
d)
Decomposition
62.
AB + CD = AD + CB
a)
Double Replacement
b)
Single Replacement
c)
Combustion
d)
Decomposition
63.
A + BC = B + AC
a)
Single Replacement
b)
Combustion
c)
Double Replacement
d)
Synthesis
64.
Which chemical reaction takes place when 2 substances react to form a single product?
a)
Decomposition
b)
Double Replacement
c)
Single Replacement
d)
Synthesis
65.
AB = A + B
a)
Decomposition
b)
Single Replacement
c)
Combustion
d)
Synthesis
66.
Fe + H2SO4 --> Fe2(SO4)3 + H2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
67.
What kind of reaction is this:
2H2 + O2 --> 2H2O
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
68.
What type of reaction occurs between an element and a compound?
Zn + 2HCl --> ZnCl2 + H2
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
69.
The reaction below is an example of?
AgNO3 + NaCl → AgCl + NaNO3
a)
Single Replacement
b)
Double Replacement
c)
Decomposition
d)
Combustion
70.
What type of reaction is illustrated below?
2HI --> H2  +  I2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
71.

Which of the following general formulas represents a single-replacement reaction?

a)

AB → A + B

b)

A + B → AB

c)

A + BC → AC + B

d)

AB + CD → AD + CB

72.

The Law of Conservation of Mass states that the total mass of the reactants should be

a)

More than the mass of the products

b)

Equal to the mass of the products

c)

Ignored during the reaction

d)

Less than the mass of the products

73.

Which of the following reactions involves the ions of two compounds exchanging places to form two new compounds?

a)

Synthesis

b)

Double replacement

c)

Combustion

d)

Single Displacement

74.

When balancing equations, the rule is that you can only add, change, and remove ____________

a)

Coefficients

b)

Mass

c)

Subscripts

d)

Elements

75.

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

76.
What type of reaction is C3H8 + 5O2 => 3CO2 + 4H2O?
a)
combination
b)
decomposition
c)
combustion
d)
both combination and decomposition
77.
A chemical reaction in which a compound or element burns by reacting with oxygen is called a(n)
a)
combination reaction
b)
decomposition reaction
c)
combustion reaction
d)
carbonate decomposition reaction
78.

What is the formula for rate of reaction

a)

Quantity of product X Time required

b)

Quantity of product / Time required

c)

Quantity of product + Time required

79.

We can describe the rate of a reaction best with the following word.

a)

displacement

b)

speed

c)

mass

80.

What must be met for reactant collisions to result in a successful product?

a)

The reactants must be mixed with each other in the proper proportions.

b)

The reactants must collide with enough energy, and be in the right positions.

c)

The reactants must have enough energy, and form the activated complex.

81.

What happens to the rate of a reaction when temperature increases?

a)

The rate of reaction slows down

b)

The rate of the reaction speeds up

c)

The rate of reaction stays the same

82.

True or False: Increasing the temperature will increase the kinetic energy of particles.

a)

false

b)

true

83.

True or False: Lowering the temperature will speed up a reaction.

a)

false

b)

true

84.

True or False: Catalysts allow reactions to proceed at a faster rate.

a)

True

b)

False

85.

What do we call a substance that increases the rate of a reaction without being used up during the reaction?

a)

catalyst

b)

product

c)

reactant

86.

True or False: The smaller the surface area of reactants equals a slower reaction speed

a)

True

b)

False

87.

True or False: Increasing the concentration of the reactants will slow down the reaction.

a)

True

b)

False

88.

True or False: A catalyst increases the efficiency of collisions between reactants.

a)

true

b)

false

89.

Look at the picuture: Is this an exothermic or endothermic reaction?

a)

Endothermic

b)

Exothermic

90.

Look at the picture: Is this an exothermic or endothermic reaction?

a)

Endothermic

b)

Exothermic

91.

True or False: Grinding a seltzer tablet into powder increases the rate of reaction due to increased surface area

a)

True

b)

False

c)

A change of reaction rate is possible only by adding a catalyst

92.

Why does a higher temperature increase the rate of a reaction?

a)

Energy in the system is increased

b)

Energy in the system is decreased

c)

Energy in the system is maintained

93.

Why does a higher concentration increase the rate of reaction?

a)

higher concentrations increase the frequency of collisions

b)

higher concentrations decrease the temperature

94.

Predict the rate of reaction when the concentration of reactants is increased

a)

Reaction rate will increase.

b)

Reaction rate will decrease.

c)

Catalysts will form to decrease the rate of reaction.

95.

In a chemical reaction, how quickly or slowly reactants turn

into products is called the

a)

Catalyst Rate

b)

Reaction Rate

c)

Concentration Rate

96.

What is the name given to a catalyst in the human body?

a)

Reactant

b)

Product

c)

Enzyme

97.

Predict the reaction rate response to increased concentration of reactants

a)

Faster reaction rate

b)

Slower reaction rate

c)

Constant reaction rate

98.

Does a temperature increase causes particles to speed up, slow down or increase concentration?

a)

Slow down

b)

Speed up

c)

Increase concentration

99.

How does a catalyst work in speeding up a reaction?

a)

By lowering the activation energy of a reaction

b)

By raising the activation energy of a reaction

c)

By raising the concentration of reactants of a reaction

100.

What happens to heat in an exothermic reaction?

a)

Heat is taken in

b)

Heat is released

101.

Why does a higher concentration of reactants increase the rate of reaction?

a)

it increases the frequency of particle collisions

b)

it lowers the activation energy

c)

it increases the energy of particle collisions

102.

This is what we call the level of energy required to break the bonds of the reactants.

a)

Carbonic energy

b)

Activation energy

c)

Concentration energy

103.

Reactants or Products: These are jocated on the left side of the chemical equation

a)

reactants

b)

products

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