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Chemical Reactions Reviw

Total questions: 114

Worksheet time: 4hrs 30mins

Name
Class
Date
1.

Which example provides evidence of a chemical change?

a)

Wood releases ash and smoke when burned.

b)

Rock particles separate when soil is being sifted.

c)

Boiling water bubbles when being heated.

d)

Sugar is not visible when dissolved in water.

2.

Mixing silver nitrate and sodium chloride in water will cause silver chloride to precipitate out of solution. In this example, the precipitate is silver chloride. Which example represents the formation of a precipitate?

a)

Heat and light are produced when paper burns.

b)

White chunks form when you add vinegar to milk or heavy cream.

c)

Gas is released when vinegar and baking soda are mixed together.

d)

A cut apple turns brown when left out in the open air.

3.

When vinegar and baking soda are combined, bubbles and foam are produced.

What evidence demonstrates that a chemical change has occurred?

a)

A color change occurs.

b)

A gas is formed.

c)

A solid is dissolved.

d)

A precipitate is formed.

4.

Which processes from the table can be used as evidence to identify the formation of a new substance?

a)

Processes A, B, C, and D

b)

Processes B, C, E, and F

c)

Processes B, C, D, and F

d)

Processes C, D, E, and F

5.

Students performed investigations using water and three chemicals, baking soda, calcium chloride, and phenol red solution.  The student observations are shown in the table.

Which investigations above provide supporting evidence that a new substance formed?

a)

Investigations 1, 2, and 3

b)

Investigations 1, 3, and 5

c)

Investigations 2, 3, and 4

d)

Investigations 3, 4, and 5

6.

After an investigation, students were disposing of left over substances.  One student poured all of the liquids down the sink drain.  A few seconds later, a white cloud formed above the sink and the student’s eyes began to burn.

Which statement accurately describes what caused this occurrence?

a)

The student did not wait two minutes in between pouring each liquid down the drain.

b)

The student did not allow water to run in the sink after pouring each liquid down the drain.

c)

A physical change occurred resulting in the formation of a new substance.

d)

A chemical change occurred resulting in the formation of a new substance.

7.

Table salt is a compound made from two elements, sodium and chlorine.

Which statement best explains why the characteristics of table salt are so different from the characteristics of sodium and chlorine?

a)

Salt is processed by the evaporation of seawater or mineral-rich spring water

b)

Salt is processed from salt mines because pure sodium does not occur in na

c)

When sodium and chlorine combine, a physical change occurs and a new substance is formed.

d)

When sodium and chlorine combine, a chemical change occurs and a new substance is formed.

8.

Flour, sugar, cocoa, oil, and eggs are mixed together and placed in the oven to make brownies.  When the brownies are removed from the oven, they no longer look like the original ingredients. 

Which of the following describes why the ingredients changed?

a)

A biological change occurred.

b)

No change occurred.

c)

A physical change occurred.

d)

A chemical change occurred.

9.

Students were investigating two clear solutions.  Students added 2 mL of one solution to a beaker of the other solution.  The result is pictured.

A student observed that the temperature of the beaker did not have any noticeable changes, however the mass of the substances in the beaker increased.  A red precipitate formed where the substance was poured into the beaker.  The precipitate separated from the solution and fell to the bottom of the beaker.Which observation provides the best evidence that a chemical change formed a new substance in the beaker?

a)

A precipitate is formed.

b)

The precipitate fell to the bottom.

c)

The temperature did not change.

d)

There is an increase in mass.

10.

Two liquids are mixed together.  Which of the following does NOT identify the formation of a new substance?

a)

A gas is produced.

b)

One liquid dissolves into the other.

c)

The temperature changes.

d)

A solid is formed.

11.

Which column in the table includes only chemical changes?

a)

A

b)

B

c)

C

d)

D

12.

During a science class investigation, a teacher places a small amount of sugar in a beaker and heats it over a candle.  Which of the following would be the best evidence that a change in the chemical properties of the sugar has taken place?

a)

The sugar gets hotter.

b)

The sugar gets larger.

c)

The sugar turns into a liquid.

d)

The sugar turns black.

13.

A student had a beaker with a small amount of baking soda.  The student added a few drops of pickle juice to the baking soda and observed fizzing and bubbling.  Based on observation, which of these can the student conclude?

a)

A chemical reaction produced a solid.

b)

No chemical reaction took place.

c)

Only a physical change happened.

d)

A chemical reaction produced a gas.

14.
In a chemical equation, is it true that -
a)
the reactant side and product side can have different numbers of atoms for each element
b)
there can be different elements on the reactant side and the product side
c)
an element or compound must be accompanied by a phase change
d)
the coefficients indicate the number of molecules of each reactant used and the number of molecules of each product made
15.
Which of the following models best demonstrates a balanced chemical equation?
a)
F
b)
G
c)
H
d)
J
16.
The reactants are on the left side of the chemical equation.
a)
True
b)
False
17.

How many atoms in all are in a molecule of serotonin?

C10H12N2O

a)
22
b)
24
c)
25
d)
4
18.
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
19.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
20.
Is glass breaking a chemical or phyiscal change?
a)
chemical
b)
physical
21.
Is hammering wood together to build a house a chemical or physical change?
a)
chemical
b)
physical
22.
Is a a rusting bicycle a chemical or physical change?
a)
chemcial
b)
physical
23.
Is melting butter for popcorn a chemical or physical change?
a)
chemical
b)
physical
24.
Is melting ice a chemical or physical change?
a)
chemical
b)
physical
25.
Is spoiling food a physical or chemical change?
a)
phyiscal
b)
chemical
26.
Is mixing lemonade powder with water a physical or chemical change?
a)
physical
b)
chemical
27.
Is mowing the lawn a phyiscal or chemical change?
a)
physical
b)
chemical
28.
Which of the following equations demonstrates an actual chemical reaction that forms a new substance? (HINT: it must follow the Law of Conservation of Mass)
a)
A
b)
B
c)
C
d)
D
29.
What is the left part of a chemical equation called?
H2 + O → H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
30.
Is this balanced?
2HgO → 2Hg + O2
a)
Yes
b)
No
31.
Is this balanced?
Al + O2 → 2Al2O3
a)
Yes
b)
No
32.
When materials combine to form new compounds it is a chemical change. Which example is a chemical change?
a)
baking powder fizzing
b)
water boiling
c)
ice melting
d)
sugar cube dissolving
33.
Which is an example of a chemical reaction?
a)
paper cut into small pieces
b)
chocolate melting in a pan
c)
flour and sugar mixed in a bowl
d)
cookies baking in an oven
34.
Which is an example of a chemical reaction?
a)
paper cut into small pieces
b)
chocolate melting in a pan
c)
flour and sugar mixed in a bowl
d)
cookies baking in an oven
35.
The left side of the equation below is called
a)
Products
b)
Reactants
36.
The right side of the equation below is called the
a)
products
b)
reactants
37.
A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction.
a)
Coefficient
b)
reactant
c)
subscript
d)
product 
38.

Look at the chemical equation.


Is it written correctly to show the Law of Conservation of Mass?

a)

Yes

b)

No

39.

True or False: In a complete chemical equation, there must be the same number of atoms of each element on the reactants and products side.

a)

True

b)

False

40.

___________________ are the elements or compounds that leave (are formed in) a chemical

reaction.

a)

Polymers

b)

Bonds

c)

Reactants

d)

Products

41.
How many F atoms are in this compound?
6MgF2 
a)
2
b)
6
c)
8
d)
12
42.
How many Al atoms are in this compound?         4Al2O3
a)
2
b)
8
c)
6
d)
4
43.
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
44.
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
45.

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.

46.

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

a)

Product

b)

Reactant

c)

Starters

d)

Enders

47.

What is the pH range of an acid?

a)

4-6

b)

1-7

c)

1-6

d)

8-14

48.

What would happen to blue litmus paper if it came into contact with an acid?

a)

It would turn red

b)

It would turn green

c)

It would stay blue

d)

It would turn pink

49.

Which of the following pH values would be the weakest acid?

a)

1

b)

3

c)

5

d)

6

50.

Which of the following pH values would be the strongest acid?

a)

1

b)

3

c)

4

d)

6

51.

What would happen to red litmus paper when it encounters a base?

a)

It turns blue

b)

It stays red

c)

It turns purple

d)

It turns green

52.

A substance is found to have the following characteristics:


Very bitter taste

Feels slippery to the touch

Produces OH- ions when dissolved in water


In what category would the substance be classified?

a)

acid

b)

base

c)

enzyme

d)

fatty acid

53.
Which of the following statements is correct?
a)
Blue litmus paper turns red when placed in a base.
b)
Red litmus paper turns blue when placed in a base.
c)
Blue litmus paper stays blue when placed in an acid.
d)
Red litmus paper stays red when placed in a base.
54.
Which of the following statements about acids is true?
a)
They taste sweet.
b)
They taste sour.
c)
They have a pH between 8-14.
55.
The pH of a solution is tested, and it is found to be a basic solution. Of the following choices, what could the pH have been?
a)
3
b)
9
c)
7
d)
5
56.
What would be considered the weakest base? 
a)
8
b)
14
c)

7

d)

11

57.
Pure water has a pH of 7. Pure water _______.
a)
is a base
b)
is a neutral substance
c)
could be either an acid or a base
d)
is an acid
58.

Which of these pH values represent an acid?

a)

4

b)

8

c)

10

d)

12

59.

Milk is a very weak acid. What might its pH value be?

a)

6

b)

7

c)

4

d)

12

60.

The strongest bases have pH values close to

a)

0

b)

14

c)

7

d)

5

61.

Bases turn blue litmus paper red.

a)

True

b)

False

62.

Which option below places the pH values in the correct order, from WEAKEST ACID to STRONGEST ACID?

a)

1,4,5,6

b)

6,4,3,1

c)

7,9,11,14

d)

13,12,10,8

63.

What is Solubility?

a)

If something dissolves in water

b)

If something sinks in water

c)

If something floats in water

d)

None of the above

64.

Salt has Solubility because it dissolves in water.

a)

True

b)

False

65.

Which answer does NOT have solubility?

a)

sugar

b)

salt

c)

oil

66.

What does dissolve mean?

a)

The particles spread out and become part of the water

b)

It sinks to the bottom of the water

c)

It floats on top of the water

d)

None of the above

67.

Is pepper soluble?

a)

Yes, it dissolves in water

b)

No, it sinks in water

c)

No, it floats in water

d)

Yes, it doesn't dissolve in water

68.

When something dissolves in water then it has Solubility.

a)

True

b)

False

69.
How does a solution become supersaturated?
a)
dissolve lots of solute in it.
b)
dissolve a little solute in it. 
c)
dissolve more solute than you should be able to. 
d)
dissolve a solvent in it. 
70.
Solution where more solute can still be dissolved at the given temperature. 
a)
Saturated
b)
Unsaturated
c)
Mixture
d)
Homogeneous solution
71.
Describe a solute.
a)
part of solution present in largest amount
b)
gets dissolved
c)
water
d)
surrounds and breaks apart
72.
__________ are made up of solutes and solvents.
a)
Solutions
b)
Suspensions
c)
Heterogeneous Mixtures
d)
Pure Substances
73.
When a solvent contains as much of the solute as it can hold, the solution is said to be
a)
supersaturated
b)
diluted
c)
saturated
d)
unsaturated
74.
What does it mean to dilute a solution?
a)
lower the concentration of solute per solvent
b)
increase the concentration of solute per solvent
75.
You can make a solution more concentrated by adding __________.
a)
solute
b)
solvent
c)
water
76.
What is able to dissolve other substances?
a)
Solute
b)
Salt
c)
Suspension
d)
Solvent
77.
If I dissolve sugar in water, what is the solute?
a)
Water
b)
Hydrogen
c)
Sugar
d)
Carbon
78.
If I dissolve carbon dioxide in water, what is my solvent?
a)
Carbon Dioxide
b)
There is no solvent
c)
Oxygen
d)
Water
79.
Which solute is the most soluble at 10 ⁰C?
a)
KI
b)
KClO3
c)
NH4Cl
d)
NH3
80.
Which solute is the least soluble at 90 ⁰C?
a)
SO2
b)
KClO3
c)
KI
d)
HCl
81.
Which solute does not increase in solubility as temperature rises?
a)
NH3
b)
NaNO3
c)
KNO3
d)
NaCl
82.
How many grams of SO2 can dissolve at 50 ⁰C?
a)
5 g
b)
10 g
c)
20 g
d)
39 g
83.
How many more grams of KNO3 dissolve at 50 ⁰C compared to 0 ⁰C?
a)
85 g
b)
15 g
c)
70 g
d)
100 g
84.
What is the maximum temperature where at least 60 g of HCl can dissolve?
a)
45 ⁰C
b)
55 ⁰C
c)
35 ⁰C
d)
65 ⁰C
85.
What is the minimum temperature needed to dissolve at least 10 g of KClO3?
a)
25 ⁰C
b)
10 ⁰C
c)
5 ⁰C
d)
100 ⁰C
86.
Which of the following substances increase solubility at the slowest rate with increasing temperature?
a)
SO2
b)
NaCl
c)
KCl
d)
KNO3
87.

A column of the periodic table is a ________.

a)

group

b)

period

c)

range

88.

A row on the periodic table is a _______.

a)

group

b)

period

c)

range

89.

About 3⁄4 of the elements on the periodic table are ________.

a)

metalloids

b)

nonmetals

c)

metals

d)

gases

90.

All _________ are semiconductors.

a)

metals

b)

metalloids

c)

nonmetals

d)

gases

91.

All _________ share properties that include luster, conductivity, malleability, and ductility.

a)

gases

b)

nonmetals

c)

metalloids

d)

metals

92.

Elements on the periodic table are arranged in rows and columns according to their _________.

a)

properties

b)

categories

c)

atomic number

d)

boiling point

93.

Elements with properties of metals and nonmetals are ___________.

a)

metalloids

b)

metals

c)

nonmetals

d)

gases

94.

Group 1 metals that react quickly with other elements are ___________.

a)

metals

b)

alkaline earth metals

c)

alkali metals

d)

nonmetals

95.

Group 2 metals that are soft and silvery are _______________.

a)

metals

b)

alkali metals

c)

alkaline earth metals

d)

gases

96.

___________ are located on the left side of the periodic table.

a)

Nonmetals

b)

Gases

c)

Metals

d)

Metalloids

97.

_________ are located on the right side of the periodic table.

a)

Nonmetals

b)

Metals

c)

Metalloids

d)

Gases

98.

________________ are located in the middle of the periodic table.

a)

Metals

b)

Transitions metals

c)

Nonmetals

d)

Metalloids

99.
A solution with a pH of 3.6 would be...
a)
Acid
b)
basic
c)
Neutral
d)
Acid and basic
100.

Kathy buys a 5-ounce cup of ice cream. The summer heat melts the ice cream before she can eat any. Which best describes the weight of the melted ice cream?

a)

2.5 ounces

b)

5 ounces

c)

15 ounces

d)

15 ounces

101.

An ice cube is placed in a glass of water. The total weight of the ice cube and water is 1.5 pounds. After the ice cube melts, what will most likely be the total weight of the water?

a)

0.8 pounds

b)

0.4 pounds

c)

1.5 pounds

d)

1.0 pound

102.

Ashley placed 20 grams each of water, grape juice, orange juice, and coffee in an ice cube tray. Ashley wanted to see what the mass of each liquid would be after freezing. Which is most likely Ashley's conclusion when she weights the frozen samples?

a)

Each sample will weight 40 grams

b)

Each sample will weigh 25 grams

c)

Each sample will weigh 20 grams

d)

Each sample will weigh 15 grams

103.

James wanted to observe the interaction between his favorite soda and some candy. James poured 20 ounces of soda and 2 ounces of candy in a closed container weighing 5 ounces. What would most likely be the weight of the mixture and container after the candy has completely dissolved?

a)

5 ounces

b)

20 ounces

c)

25 ounces

d)

27 ounces

104.

John filled a bottle half way with water, placed a lid on it, and then put it in the freezer. How does the weight of the water and bottle compare before and after it is in the freezer?

a)

The water and bottle weigh the same as they did when they went in the freezer.

b)

The water and bottle weigh more when they came out of the freezer because ice weighs more.

c)

The water and bottle weigh less when they came out of the freezes because water evaporates when it gets cold.

105.

Pat raked and bagged 2 pounds of maple leaves that had fallen to the ground. Which best describes the weight of the leaves before they fell to the ground?

a)

0.5 pounds

b)

1 pound

c)

2 pounds

d)

2.5 pounds

106.

A jeweler melts silver to make jewelry. As the silver melts, the mass?

a)

increases

b)

decreases

c)

is destroyed

d)

stays the same

107.

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)

5.75 grams

c)

5.25 grams

108.
12g of Carbon react with 16g of Oxygen, how much carbon monoxide (CO) is formed? 
a)
28 g
b)
4g
c)
30g
d)
12g
109.

What is the Law of Conservation of Mass?

a)

Mass is created in a chemical reaction

b)

Mass is created in a physical change

c)

New chemicals formed from a chemical reaction have a larger overall mass than the original reactants

d)

Mass is never created or destroyed

110.

In reaction A +B --> C, reactants A + B have a total mass of 9g. What is the mass of product C?

a)

4g

b)

5g

c)

9g

d)

14g

111.

In reaction A +B --> C, reactant A has a mass of 4g and product C has a mass of 9g. What is the mass of reactant B

a)

4g

b)

5g

c)

9g

d)

14g

112.

In reaction A +B --> C, reactant B has a mass of 9g and product C has a mass of 14g. What is the mass of reactant A?

a)

4g

b)

5g

c)

9g

d)

14g

113.

7 g of hydrogen reacts with 17 g of oxygen to produce ______ g of water

a)

14

b)

24

c)

38

d)

62

114.

During a chemical reaction matter cannot be created or destroyed.

a)

True

b)

False

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