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Unit 5 Review

Total questions: 132

Worksheet time: 7hrs 36mins

Name
Class
Date
1.

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

a)

Product

b)

Reactant

c)

Starters

d)

Enders

2.

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.

3.
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
4.
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
5.
How many Al atoms are in this compound?         4Al2O3
a)
2
b)
8
c)
6
d)
4
6.
How many F atoms are in this compound?
6MgF2 
a)
2
b)
6
c)
8
d)
12
7.

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

reaction.

a)

Polymers

b)

Bonds

c)

Reactants

d)

Products

8.

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

9.

Look at the chemical equation.


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

a)

Yes

b)

No

10.
The left side of the equation below is called
a)
Products
b)
Reactants
11.
The right side of the equation below is called the
a)
products
b)
reactants
12.
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 
13.

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.

14.

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.

15.

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.

16.

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

17.

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

18.

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.

19.

Students performed multiple investigations at different stations in the classroom.  The data collected is listed in the table.

The observations from which investigations provide evidence that a new substance was formed?

a)

Stations 1, 3, 4, and 5

b)

Stations 2, 5, and 6

c)

Stations 1, 3, and 4

d)

Stations 1, 2, 3, and 4

20.

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.

21.

Students performed an investigation to see what would happen when sugar is exposed to heat. The students' observations are listed in the table.

Which students’ observations indicate that a new substance formed as a chemical change occurred?

a)

Student A and Student C

b)

Student B and Student C

c)

Student A and Student D

d)

Student B and Student D

22.

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.

23.

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.

24.

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.

25.

Which column in the table includes only chemical changes?

a)

A

b)

B

c)

C

d)

D

26.

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.

27.

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.

28.
True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed. 
a)
true
b)
false
29.
A chemical change is different than a physical change because in a chemical change
a)
Chemicals are used
b)
Molecules do not physically touch
c)
A new substance is formed and in a physical change no new substance is formed
d)
The change can be seen but in a physical change it cannot
30.
The left side of the equation below is called
a)
Products
b)
Reactants
31.
The right side of the equation below is called the
a)
products
b)
reactants
32.
Which statement is not a description of a chemical reaction?
a)
A solid is dropped into a beaker of liquid and a gas is released.
b)
Two liquids are mixed in a beaker and a solid forms at the bottom of the beaker.
c)
A solid is dropped into a beaker of liquid and an explosion occurs.
d)
A liquid is heated in the sun and half of it evaporates.
33.
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 
34.
A chemical reaction that absorbs heat
a)
Single replacement
b)
Exothermic
c)
Endothermic
d)
Decomposition
35.
In a chemical reaction
a)
The atoms of the reactants always stay together to form the products
b)
The atoms of the reactants unbond, rearrange, and then rebond to form the products
c)
New atoms are formed which combine to make the products
d)
Some atoms disappear while others multiply to form the products
36.
Which of the following answers will balance the equation below?
__K + __Br2 --> __KBr
a)
2, 1, 1
b)
2, 3, 2
c)
2, 1, 2
d)
1, 2, 3
37.
If the reactants on the left side of a chemical equation are C₃H₈ + 5O₂, the products in a balanced equation could be
a)
4CO₂ + 3H₂O
b)
3CO₂ + 4H₂O
c)
2CO₂ + 3H₂O
d)
3CO + 4H₂O
38.
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
39.

How many Carbons are present on the reactant side?

a)

1

b)

2

c)

3

d)

4

40.

How many Hydrogens are on the product side of this chemical equation?

a)

1

b)

2

c)

3

d)

4

41.

Is this chemical equation balanced? Why or why not? Choose the BEST answer.

a)

Yes, the amount of atoms for each element are equal on both the reactant and product side.

b)

No, the carbons are not the same number on both the reactant and product side.

c)

No, neither the carbons or hydrogens are the same amount on both the reactant and product side.

d)

No, none of the elements (carbon, hydrogen, or oxygen) are the same amount on both the reactant and product side.

42.
Number of C's in 2Na₂CO₃
a)
1
b)
2
c)
3
d)
5
43.
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.
44.
Balance this equation,            
Al2O3 --> Al + O2 
a)
Cannot be balanced
b)
2Al2O3 --> 2Al+3O2 
c)
2Al2O3--> 4Al+3O2 
d)
3Al2O3--> 2Al+O2 
45.
the starting materials in a chemical reaction
a)
Products
b)
Reactants
c)
Starters
d)
Enders
46.
a chemical reaction that releases energy by light or heat
a)
Endothermic Reaction
b)
Exothermic Reaction
c)
Diffusion
d)
Fission
47.
If reaction starts with 20g of reactants it should produce... 
a)
a total of 40g of product
b)
a total of 10g of product
c)
a total of 80 g of product
d)
a total of 20g of product
48.
Breaking down a substance into simpler substances
a)
Displacement
b)
Synthesis
c)
Decomposition
d)
Oxidation
49.

Identify the following chemical reaction.

2 NaBr + 1 Ca(OH)2 ----> 1 CaBr2 + 2 NaOH

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

50.

Identify the following chemical reaction.

3 HBr + 1 Al(OH)3 ----> 3 H­2O + 1 AlBr3

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

51.

Identify the following chemical reaction.

Pb + FeSO4 ----> PbSO4 + Fe

a)

Synthesis (or combination)

b)

Decomposition

c)

Single displacement

d)

Double displacement

52.

What reaction has the following general formula:

AB --> A + B

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

53.

What reaction has the following general formula:

A + CD --> C + AD

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

54.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

55.

What reaction has the following general formula:

A + B --> AB

a)

Synthesis

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

56.

Which chemical reaction always starts with a hydrocarbon that reacts with oxygen and produces carbon dioxide and water?

a)

Decomposition

b)

Synthesis

c)

Combustion

d)

Single Replacement

57.

Which phrase describes what happens to atoms in a chemical reaction?

a)

never lost or gained, just rearranged

b)

sometimes lost, never rearranged

c)

sometimes lost, gained, or rearranged

d)

lost or gained, never rearranged

58.

In a chemical reaction, everything to the right of the arrow are called ______________.

a)
Products
b)
Yields
c)
Molecules
d)
Reactants
59.
What type of reaction is the equation C + O2 → CO2?
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
60.
What type of reaction is the equation 2NaCl →2Na +Cl2?
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
61.
Cu + 2Ag(NO3) → 2Ag + Cu(NO3)
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
62.

Consider the chemical equation CH4 + 2 O2 → CO2 + 2 H2O. What type of reaction is this?

a)

Synthesis

b)

Combustion

c)

Double Replacement

d)

Decomposition

63.

What are the reactants in the chemical equation pictured?

a)

CH4 and CO2

b)

CH4 and O2

c)

CO2 and H2O

d)

O2 and H2O

64.

3KOH + H3PO4 --> K3PO4 + 3H2O

a)

Combination

b)

Decomposition

c)

Single replacement

d)

Double replacement

65.

2Na +S → Na2S

a)

Double Replacement

b)

Decomposition

c)

Combustion

d)

Synthesis

66.

2 NO2 ---> 2 O2 + N2

a)

Synthesis

b)

Single Replacement

c)

Decomposition

d)

Combustion

67.

What reaction has the following general formula:
CxHy + O2 −>CO2 + H2OC_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

68.

What reaction has the following general formula:

A + CD --> C + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

69.

compound ---> element + element

a)

synthesis

b)

decomposition

c)

combustion

d)

single replacement

70.

What reaction has the following general formula:

AB + CD --> CB + AD

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

71.

What reaction has the following general formula:
CxHy + O2 −>CO2 + H2OC_xH_y\ +\ O_2\ ->CO_{2\ }+\ H_2O  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

72.

What is the general reaction scheme for a decomposition reaction?

a)

A + B --> AB

b)

AB --> A + B

c)

A + CD --> C + AD

d)

AB + CD --> CB + AD

e)

CxHy+O2 −> CO2+H2OC_xH_y+O_2\ ->\ CO_2+H_2O

73.

What type of reaction is the following:
BaCl2+2KI −> 2KCl + BaI2BaCl_2+2KI\ ->\ 2KCl\ +\ BaI_2  

a)

Combination

b)

Decomposition

c)

Single Replacement

d)

Double Replacement

e)

Combustion

74.

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

75.

What is the number before a chemical formula called?

Example: 2H2 + O2 ---> 2H2O

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

76.

What is the Law of Conservation of Mass?

a)

It states that matter cannot be created or destroyed.

b)

It states that energy cannot be created or destroyed.

c)

It states that matter can be created or destroyed.

d)

It states that sound can be created or destroyed.

77.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
78.
Element or compound?
O2
a)
Element
b)
Compound
79.
Element or compound?
H2O
a)
Element
b)
Compound
80.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
81.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
82.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
83.
How many Hydrogen are in 4H2O?
a)
6
b)
8
c)
2
d)
4
84.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
85.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
86.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
87.
Balance this equation:
 2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
88.

What is the left part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical equation

89.

What is the right part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

90.

What is the total number of atoms present in 5Na3PO4?

a)

5

b)

55

c)

40

d)

8

91.

How many Mn atoms are found in the following compound?

2MnO4

a)

1

b)

2

c)

4

d)

8

92.

What is the little number after an element in a chemical equation called?

Example: H2

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

93.

Is the following equation balanced?

Al + O2 ---> 2Al2O3

a)

YES

b)

NO

94.

Is the following equation balanced?

2C2H2 + 5O2 ---> 4CO2 + 2H2O

a)

YES

b)

NO

95.

Is the following equation balanced?

NaHCO3 ---> Na2CO3 + H2O + CO2

a)

YES

b)

NO

96.

Which of the following equations are correctly balanced?

a)

12CO2 + H2O ---> C6H12O6 + O2

b)

CO2 + H2O ---> 3C6H12O6 + O2

c)

CO2 + 9H2O ---> C6H12O6 + O2

d)

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

97.

Balance this equation:

H2 + Cl2 ---> HCl

a)

It is balanced.

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

d)

H2 + 3Cl2 ---> 6HCl

98.

Balance this equation:

HgO ---> 2Hg + O2

a)

It is balanced.

b)

2HgO ---> 2Hg + O2

c)

2HgO ---> Hg + O2

d)

HgO ---> Hg + 2O2

99.
What is the Law of Conservation of Mass?
a)
It states that no matter can be created or destroyed.
b)
It states that no energy can be created or destroyed.
c)
It states that matter can be created or destroyed.
d)
It states that no sound can be created or destroyed.
100.
What does the Law of Conservation of Mass state?
a)
Matter cannot be gained or lost in a chemical reaction.
b)
Matter can only be lost in a chemical reaction.
c)
Matter can only be gained in a chemical reaction.
d)
Matter can be gained and lost in a chemical reaction. 
101.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
102.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products 
c)
Yields 
d)
Chemical Equation 
103.
What is the total number of atoms present in 5Na3PO4
a)
5
b)
40
c)
55
d)
8
104.
How many Mn atoms are found in the following compound?
3Cr(MnO4)6
a)
3
b)
4
c)
6
d)
18
105.
What is the little number after an element in a chemical equation called.
Example: H2
a)
Coefficient 
b)
Subscript
c)
Atom
d)
Equation
106.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
107.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
108.
Element or compound?
H2O
a)
Element
b)
Compound
109.
What is the number before a chemical formula called?
Ex: 2H2 + O2 --> 2H2O
a)
Coefficient
b)
Subscript
c)
Atom
d)
Equation
110.
How many aluminum atoms are in Al2(SO4)3?
a)
1
b)
2
c)
3
d)
4
111.
In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?
a)
H3PO4
b)
H2SO4
c)
HClO3
d)
H2O
112.
Is the following equation balanced?
4Fe + 3O2 --> 2Fe2O3
a)
yes
b)
no
113.
Which of the following equations are correctly balanced?
a)
12CO2 +H2O --> C6H12O6 + O2
b)
CO2 + 9H2O --> C6H12O6 + O2
c)
CO2 + H2O --> 3C6H12O6 + O2
d)
6CO2 + 6H2O --> C6H12O6 + 6O2
114.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
115.

Balance this equation

_Al +_HCl --> _H2 +_AlCl3

a)

2,6,3,2

b)

it's already balanced

c)

4,12,3,4

d)

2,1,4,5

116.

Balance the following equation:

___ H2+ ___ O2→___ H2O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2,1, 2

117.

Balance the following equation:

___ SeCl6+ ___ O2→___ SeO2+____Cl2

a)

1, 1, 1, 3

b)

2, 1, 2, 1

c)

1, 2, 1, 2

d)

2, 2, 2, 4

118.
The group number tells us how many _________ there are in an element.
a)
groups
b)
valence electrons
c)
energy levels
d)
chemicals
119.
True or False - An energy level has to be full before moving on to the next energy level?
a)
true
b)
false
120.
What is the standard unit of mass at the atomic level?
a)
centimeters
b)
millimeters
c)
amu
d)
milligrams
121.
What is an atom which has gained or last electrons called?
a)
isotope
b)
atom
c)
ion
d)
balanced
122.
What is the octet rule?  How many valence electrons can the first three periods hold?
a)
8
b)
2
c)
2 8 8
d)
2 8 16
123.

FeS + HCl → FeCl2 + H2S FeS\ +\ HCl\ \rightarrow\ FeCl_2\ +\ H_2S\  is a ________ chemical equation

a)

Balanced

b)

Unbalanced

124.

FeS + 2HCl → FeCl2 + H2S FeS\ +\ 2HCl\ \rightarrow\ FeCl_2\ +\ H_2S\  is a ________ chemical equation

a)

Balanced

b)

Unbalanced

125.

CH4 +2O2 → CO2 +2H2OCH_4\ +2O_2\ \rightarrow\ CO_2\ +2H_2O   is a ________ chemical equation

a)

Balanced

b)

Unbalanced

126.

CH4 +O2 → CO2 +2H2OCH_4\ +O_2\ \rightarrow\ CO_2\ +2H_2O   is a ________ chemical equation

a)

Balanced

b)

Unbalanced

127.

FeCl3 +Na3PO4 → NaCl +FePO4FeCl_3\ +Na_3PO_4\ \rightarrow\ NaCl\ +FePO_4   is a ________ chemical equation

a)

Balanced

b)

Unbalanced

128.

FeCl3 +Na3PO4 → 3NaCl +FePO4FeCl_3\ +Na_3PO_4\ \rightarrow\ 3NaCl\ +FePO_4   is a ________ chemical equation

a)

Balanced

b)

Unbalanced

129.

HCl + NaOH → NaCl +H2OHCl\ +\ NaOH\ \rightarrow\ NaCl\ +H_2O   is a ________ chemical equation

a)

Balanced

b)

Unbalanced

130.

HCl + 4NaOH → NaCl +H2OHCl\ +\ 4NaOH\ \rightarrow\ NaCl\ +H_2O   is a ________ chemical equation

a)

Balanced

b)

Unbalanced

131.

A ________ chemical equation contains an equal number of reactant and product atoms.

a)

Balanced

b)

Unbalanced

132.

An ________ chemical equation contains an unequal number of reactant and product atoms.

a)

Balanced

b)

Unbalanced

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