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Chemical Reactions

Total questions: 149

Worksheet time: 3hrs 22mins

Name
Class
Date
1.

Lemonade, coke, and salt water are all examples of _________.

a)

Solutions

b)

Mixtures

c)

Pure Substances

d)

Factors of solubility

2.

A combination of substances that dissolve into one another--they are evenly mixed so that individual parts cannot be seen or separated.

a)

solutions

b)

mixtures

c)

observations

3.

Is Trailmix an example of a Mixture?

a)

Yes

b)

No

4.

Are these Jellybeans an example of a Mixture?

a)

Yes

b)

No

5.

How can we separate a solution?

a)

By freezing it

b)

Melting it.

c)

By heating it so that the solution evaporates.

d)

We can't.

6.
What is a solute?
a)
The substance that does the dissolving in a solution.
b)
The substance that is dissolved into the solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons
7.
What is a solvent?
a)
The substance that does the dissolving in a solution.
b)
The substance that is being dissolved in a solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons
8.
a)

solvent

b)

solute

9.
a)

solvent

b)

solute

10.

The water and oil separate from each other.

Is this an example of a Solution?

a)

Yes

b)

No

11.

This type of mixture has large enough particles that you can see the different types of particles.

a)

Homogeneous

b)

Heterogeneous

c)

Colloid

d)

Solution

12.

A colloid mixture does not have particles large enough to settle to the bottom, but they are large enough to

a)

be filtered out of the solution.

b)

be pulled out by hand.

c)

float to the top.

d)

scatter light waves.

13.

A mixture with such small particles that you cannot see the individual particles.

a)

Suspension

b)

Sublimation

c)

Heterogeneous

d)

Homogeneous

14.

This word means "the same throughout".

a)

Homogeneous Mixture

b)

Heterogeneous Mixture

c)

Suspension Mixture

d)

Compound Mixture

15.

This words means "different throughout".

a)

Homogeneous Mixture

b)

Heterogeneous Mixture

c)

Colloid Solution

d)

Compound Mixture

16.

Which of the following examples is a Heterogeneous mixture?

a)

Tap Water

b)

Beach Sand

c)

Vanilla Cake Mix

d)

Bottle of Cola

17.

Which of the following examples is a Homogeneous mixture?

a)

Tap Water

b)

Beach Sand

c)

Chocolate chip cookie

d)

Mud water

18.

Which of the following examples is a Suspension?

a)

Mud water

b)

Well water

c)

milk

d)

Fog

19.

What is it called when a mixture like muddy water is left alone and the particles settle to the bottom of the mixture?

a)

Suspension

b)

Colloid

c)

Homogeneous mixture

d)

Evaporation

20.

What type of solution would kool-aid be?

a)

Homogeneous

b)

heterogeneous

c)

The solution to all of our problems

d)

Neither

21.

What does this picture represent?

a)

Element

b)

Mixture

c)

Compound

22.

What does this picture represent?

a)

Element

b)

Compound

c)

Mixture

23.

What does this picture represent?

a)

Element

b)

Compound

c)

Mixture

24.

Is salt (NaCl) an element, compound, or mixture?

a)

Element

b)

Compound

c)

Mixture

25.
What are TWO descriptions or examples of an Exothermic reactions?
a)

Combustion

b)

Feels Cold

c)

Melting Ice

d)

Feels Hot

26.

What are TWO descriptions or examples of an endothermic reactions?

a)

Melting Ice

b)

Feels Hot

c)

Combustion

d)

Feels Cold

27.

The table shows the solubility of three different substances in water at the same temperature and pressure. Which of the substances would have the greatest mass dissolved in 100 grams of water at the point of saturation?

a)
Aluminum Chloride
b)
Silver Fluoride
c)
Potassium bromide
28.
What type of mixture is this?
a)
Homogeneous
b)
Hetrogeneous
29.
What type of mixture?
a)
Homegenous
b)
Hetrogeneous
30.

A pure substances ________ be broken down into simpler matter using physical methods.

a)

sometimes

b)

can

c)

can not

31.

Homogeneous mixtures are also called _______.

a)

Heterogenous mixtures

b)

Solutions

c)

Problem Solvers

d)

Water

32.

When we made popsicles, & added sugar to room temperature water until the sugar would no longer dissolved, what type of solution did we make?

a)

Dilute Solution

b)

Concentrated Solution

c)

Saturated Solution

d)

Supersaturated Solution

33.

When we added sugar to some warm water from the sink & were able to add more that what the room temperature could hold...what type of solution did we make?

a)

Dilute Solution

b)

Concentrated Solution

c)

Saturated Solution

d)

Supersaturated Solution

34.

A homogeneous mixture has ...

a)

components that are easily seen and sorted.

b)

components that are easily separated by settling filtration.

c)

components that do not separate or are spread out evenly throughout the mixture

d)

a concentration of solute in the mixture.

35.

In a mixture of grape juice, which of these ingredients would be the solvent?

a)

sugar

b)

water

c)

grapes

d)

flavors

36.

Solubility is ...

a)

whether it is a colloid or solution.

b)

how much solvent is in a solute.

c)

how the particles in a solution react to light.

d)

how much solute will dissolve in a solvent.

37.

Mixtures that do not blend smoothly throughout and the individual substances remain distinct

a)

Heterogeneous Mixture

b)

Homogeneous Mixture

c)

Solution

d)

Miscible

38.

A heterogeneous mixture in which the particles will settle out if left undisturbed

a)

Colloids

b)

Suspensions

c)

Miscible

d)

Immiscible

39.

True or False. In a mixture the chemical properties of each substance are lost, and new chemical properties form

a)

True

b)

False

40.

Classify the following as either a heterogeneous or homogeneous mixture: Apple juice (no pulp)

(a)  

41.

A green powder is heated & a gas is given off while it turns to a black solid. This describes

a)

Physical Change

b)

Chemical Change

c)

Change in State

d)

Change in Temperature

42.

Which of the following could indicate that a chemical change took place?

a)

Change in color

b)

Production of Energy

c)

Formation of Gas

d)

All are correct

43.

The formation of a solid when two liquids combine is called?

a)

Solidification

b)

Freezing

c)

Precipitate

d)

Solubility

44.

The difference between a Physical change and a Chemical change is…

a)

Physical change is only a change to the outside appearance.

b)

Chemical change is when matter is changed into something new.

c)

Atoms are rearranged in chemical changes & not in physical.

d)

All are correct.

45.

What does a chemical change result in?

a)

A change in state of the substance (ex. liquid to solid)

b)

A change in texture of the substance.

c)

A change in the way atoms are bonded to each other.

d)

A change in the appearance of the substance.

46.

Identify what type of change happening in the picture below...

a)

Chemical Change

b)

Physical Change

c)

Endothermic Reaction

d)

Exothermic Reaction

47.

Identify what type of change happening in the picture below...

a)

Chemical Change

b)

Physical Change

c)

Endothermic Reaction

d)

Exothermic Reaction

48.

Identify what type of change happening in the picture below...

a)

Chemical Reaction

b)

Physical Change

c)

Change in State

d)

Change in appearance only

49.

If the chemical properties of a substance remain unchanged & the appearance or shape of an substance changes it is a...

a)

Chemical Change

b)

Physical Change

c)

Both a physical and chemical change.

d)

Neither a physical or chemical change.

50.

Which of the following is an example of a physical change?

a)

A glass falling and shattering on the floor.

b)

Baking a birthday cake.

c)

Burning a piece of paper.

d)

Baking soda and vinegar mixing together.

51.

When a new substance is formed with different properties than the original substance it is called a...

a)

Chemical change

b)

Physical change

c)

Change in State

d)

Change in appearance only.

52.

Which is not a clue that could indicate a chemical change has occurred?

a)

Change in color

b)

Change in shape

c)

Release of energy

d)

Formation of an odor

53.

During Chemical Reactions, the new substances created are called?

a)

Precipitate

b)

Corrosion

c)

Reactants

d)

Products

54.

During Chemical Reactions, the substances that are used are called?

a)

Precipitate

b)

Corrosion

c)

Reactants

d)

Products

55.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

56.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

57.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

58.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

59.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

60.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

61.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

62.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

63.

Is this an example of a physical or chemical change?

a)

physical

b)

chemical

64.

Is this an example of a physical or chemical change?

a)

physical

b)

change

65.

Which of the following is NOT a physical change?

a)

Crushing a can

b)

boiling water

c)

shredding paper

d)

burning paper

66.

Which of the following is NOT a sign of a chemical change?

a)

formation of a precipitate

b)

unexpected color change

c)

unexpected temperature change

d)

change in state of matter

67.

bubbles can be an indication that a reaction has happened and produced a gas, but not always. Which of the following scenarios involve bubbles resulting from a chemical change?

a)

Mixing vinegar and baking soda

b)

Pouring a glass of soda

c)

Boiling water

d)

All of these are examples of chemical change

68.

A chemical reaction ...

a)

forms a new substance

b)

makes a mixture of several substances

c)

always involves flames

d)

all of these choices are true

69.

Which of the following are clues that chemical change may have occurred?

a)

Color change

b)

Bubbles

c)

Pressence of an odor that wasn't there before

d)

All of these could indicate chemical change

70.

Why does the temperature change during a chemical reaction?

a)

Because we have to heat up the chemicals before they can react

b)

Because the reaction will release or absorb heat when bonds are broken, formed or rearranged

c)

Because all reactions produce flames, which are hot

d)

Because electrons keep changing energy levels

71.

Color change can indicate a chemical change, however, it could also be caused by a physical change. In which scenario is the color change caused by a chemical change?

a)

Paint is scraped off of an old cabinet changing the cabinet's color from green to brown

b)

Two clear solutions are mixed and a yellow solid forms

c)

Cream is added to black coffee changing the color to a light brown

d)

All of these are examples of chemical change

72.
Physical or Chemical Change?  Cutting an orange into wedges.
a)
Physical Change
b)
Chemical Change
73.
Is milk going sour a physical or chemical change?
a)
Physical 
b)
Chemical
74.
Is Gatorade powder dissolving in water physical or chemical change?
a)
Physical 
b)
Chemical
75.
Is mold growing on cheese a physical or chemical change?
a)
Physical 
b)
Chemical
76.
Is sharpening a pencil a physical or chemical change?
a)
Physical 
b)
Chemical
77.
Is copper tarnishing a physical or chemical change?
a)
Physical 
b)
Chemical
78.
Is the formation of the grand canyon a physical or chemical change?
a)
Physical 
b)
Chemical
79.
Baking cupcakes
a)
Physical Change
b)
Chemical Change
80.
melting ice cream
a)
physical change
b)
chemical change
81.
mowing the lawn
a)
physical change
b)
chemical change
82.

Is melting butter for popcorn a chemical or physical change?

a)

chemical

b)

physical

83.
Fizzing, foaming, and burning are all examples of
a)
Chemical change
b)
Physical change
84.

When you break a cracker into pieces it is a...

a)

Chemical change

b)

Physical change

85.
Photosynthesis is an example of a
a)
physical change
b)
chemical change
86.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
87.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
88.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released 
89.
Have you ever eaten sherbet sweets candy? They fizz in your mouth and your tongue feels cold. Why do you think that is?
a)
It is an exothermic reaction
b)
It is an endothermic reaction
90.

_____ reactions usually feel hot!

a)

endothermic

b)

exothermic

91.

____ reactions usually feel cold.

a)

endothermic

b)

exothermic

92.
A catalyst works by
a)
changing the order of the reaction
b)
increasing the temperature
c)
lowering the activation energy
d)
making the activated complex
93.

Which type of reaction is shown by the graph?

a)

exothermic

b)

endothermic

c)

nuclear

d)

allergic

94.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
95.
When iron nails get rusty, heat is released.  What process is this?
a)
Exothermic
b)
Endothermic
96.
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______. 
a)
Warm
b)
Cold
97.

What would likely happen if you were to touch the flask in which an exothermic reaction was occurring?

a)

The flask would feel cooler

b)

The flask would feel warmer

c)

The flask would feel the same before and after a reaction

d)

None of the above

98.

What instrument would you use to detect an endothermic or exothermic reaction?

a)

triple beam balance

b)

ruler

c)

thermometer

99.
What is true of this reaction?
a)
Equal amounts of energy were released and absorbed
b)
The reaction released more energy than it absorbed
c)
The reaction absorbed more energy than it released
100.

What type of reaction is illustrated by the graph?

a)

exothermic

b)

endothermic

c)

nuclear

101.

Cold Pack

a)

Endothermic

b)

Exothermic

102.

In an endothermic reaction, heat is ...

a)

taken in

b)

given out

103.
In an exothermic reaction, heat is ...
a)
taken in
b)
given out
104.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
c)
None of these 
105.

5. When ammonium chloride dissolves in water the temperature falls. The type of energy change is described as?

a)

exothermic    

b)

activated  

c)

decomposition            

d)

endothermic

106.

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?

a)

It is an exothermic reaction

b)

It is an endothermic reaction

107.
How many atoms are there TOTAL in:
H2SO4
a)
6
b)
5
c)
7
d)
3
108.

How many Aluminum atoms are in Al2O3?

a)
3
b)
2
c)
5
109.

The total number of atoms in Na₂CO₃

a)
1
b)
2
c)
3
d)
6
110.
How many Sodium (Na) are in 6NaCl?
a)
1
b)
12
c)
6
111.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
112.
How many Magnesium are in 10MgCl2?
a)
10
b)
5
c)
20
113.

Calculate the number of Oxygen atoms in Al(OH)3

a)

1

b)

2

c)

3

d)

4

114.

How many atoms are in 3Al₂(SO₄)₃

a)
4
b)
12
c)

51

d)

30

115.

Which choice matches the number of atoms for: 4CF2Cl2

a)

C = 4, F = 4, Cl = 2

b)

C = 1, F = 8, Cl = 8

c)

C = 4, F = 8, Cl = 8

d)

C = 1, F = 4, Cl = 8

116.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
117.

How many total atoms are in the compound CH4?

a)

5

b)

4

c)

6

d)

8

118.

Calculate the total atoms for: H2C2H3O2?

a)

1

b)

2

c)

9

d)

4

119.

A subscript will tell you the number of atoms of the element ___ it

a)

after

b)

before

120.

A subscript behind a set of parentheses belongs to

a)

the element right before it

b)

all the elements within the parentheses before it

c)

all the elements in the parenthese after it

d)

the element right after it

121.

How many atoms of carbon are in this compound?

2H2(C3O4N5)2

a)

3

b)

12

c)

6

d)

10

122.

What are the total number of atoms for:

H3O5(CaCl7)2

a)

15

b)

20

c)

24

d)

34

123.

How many total atoms in the following equation?

ClN6Fe2

a)

6

b)

8

c)

10

d)

9

124.

Identify the Coefficient.

3BeH5Si8

a)

5

b)

3

c)

1

d)

8

125.

Identify the subscripts.

4Fe5K2

a)

4

b)

5

c)

2

d)

1

126.

How many total atoms in the following equation?

3He2Ag5

a)

2

b)

21

c)

24

d)

5

127.

How many atoms of Hydrogen are in this equation?

5Cl2H5

a)

10

b)

2

c)

5

d)

25

128.

How many atoms of Iron in the following equation?

C2HAu5

a)

2

b)

0

c)

9

d)

7

129.

How many total atoms in the following equation?

2(H2)3

a)

2

b)

6

c)

7

d)

12

130.

How many Nitrogen atoms are in (NH₄)₂N2CrO₄?

a)

2

b)

4

c)

8

d)

16

131.

Which one is the coefficient 4H2O?

a)

4

b)

H

c)

2

d)

O

132.
Which is the correct formula for:
 three hydrogen (H)
one sulfur (S)
four oxygen (O)
a)
H3SO4
b)
HSO4
c)
H4S3O
d)
H2O
133.

How many atoms are in one formula unit of Zn(C2H3O2)2 ?

a)
15
b)

8

c)

5

d)

25

134.
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
135.
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
136.
Which of the following shows the correct way to balance the chemical equation?
Fe + O2 -> Fe2O3
a)
4Fe + 3O2 -> 2Fe2O3
b)
2 Fe + 3O2 -> Fe2O6
c)
4 Fe + O6 -> 2Fe2O3
d)
None of the options are correctly balanced.
137.
Which of the following reactions is balanced?
a)
2CH4 + O2 -> CO2 + H2O
b)
CH4 + 2O2 -> CO2 + H2O
c)
CH4 + 2O2 -> CO2 + 2H2O
d)
None of the chemical equations are balanced.
138.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
139.
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
140.
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
141.
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
142.
The substances listed on the right side of a chemical equation are the
a)
Yields
b)
Reactants
c)
Products
d)
Precipitates
143.
The substances listed on the left side of a chemical equation are the
a)
Products
b)
Coefficients
c)
Precipitates
d)
Reactants
144.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
145.

Which is the Law of Conservation of Matter?

a)

matter cannot be created or destroyed, it only rearranges

b)

matter can be created but it cannot be destroyed, it never rearranges

c)

matter can be destroyed but it cannot be created, it usually just rearranges

d)

matter is an unproven theory created by Hans Geiger

146.
Which number should go in the blank?
_ H2 + O2 -> 2 H2O
a)
1
b)
2
c)
3
d)
0
147.
Which number should go in the blank?
2 Na+ _ Cl2 -> 2 NaCl
a)
1
b)
2
c)
3
d)
0
148.
How many Oxygen (O) atoms are in 2C2HO8Cl2
a)
2
b)
16
c)
8
d)
5
149.

Identify the Reactants in this equation.

a)

A

b)

B

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