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Worksheets

Unit 3A Test Review

Total questions: 145

Worksheet time: 7hrs 59mins

Name
Class
Date
1.
Predict the products for the following reactants.
C6H12 + O2 --> 
a)
CO + H2
b)
CO2 + O2
c)
C3H6O
d)
CO2 + H2O
2.
Predict the products for the following reactants.
Na + MgCl2 -->
a)
NaCl + Mg
b)
NaCl2 + Mg
c)
No Reaction
d)
NaMgCl2
3.
Predict the products for the following reactants.
Al + O2 --> 
a)
AlO
b)
AlO2
c)
Al2O3
d)
Al2O
4.
Predict the products for the following reactants.
AgNO3 + Na2CO3 -->
a)
Ag2CO3 + NaNO3
b)
No Reaction
c)
AgCO3 + NO3Na
d)
AgCO3 + NaNO3
5.
Predict the products for the following reactants.

Al + CuCl2 -->
a)
No Reaction
b)
CuAl + Cl2
c)
Cu + AlCl3
d)
Cu2 + AlCl2
6.
Predict the products for the following reactants.

K2CO3 + BaCl2 -->
a)
No Reaction
b)
KCl + BaCO3
c)
K2Cl + BaCO3
d)
KCl2 + BaCO3
7.
Predict the products for the following reactants.
NaCl + CaBr2 -->
a)
NaBr + CaCl2
b)
NaBr2 + CaCl2
c)
No Reaction
d)
NaBr + Cl2Ca
8.
Write a complete balanced reaction for the following.
Liquid butane, C4H8, is burned in the presence of gaseous oxygen.
a)
C4H8 (l) + 6 O2 (g) --> 4 CO2 (g) + 4 H2O (g)
b)
C4H8 (l) + 12 O (g) --> 4 CO2 (g) + 4 H2O (g)
c)
C4H8 (l) + 12 O2 (g) --> 4 CO2 (g) + 4 H2O (g)
d)
C4H8 (l) + 5 O2 (g) --> 4 CO2 (g) +  O2 (g) + 4 H2 (g)
9.
Write a complete reaction for the following.
Solid iron (III) oxide decomposes.
a)
2 Fe2O3 (s) → 4 Fe (s) + 3 O2 (g)
b)
Fe2O3 (s) → 2 Fe (s) + 3 O (g)
c)
2 FeO (s) → 2 Fe (s) +  O2 
d)
Fe3O2 (s) → 3 Fe (s) + O2 
10.

If an element is diatomic it should have a subscript of___

a)

1, always

b)

2, only when it is an element

c)

it shouldn't have a subscript, it should have a coefficent

d)

2, when bonded in a compound

11.

What is the charge of Iron in this compound. (Hint: think swap drop method):

Fe3(PO4)2

a)

3+

b)

2+

c)

1+

d)

6+

12.

Fill in the blank. (Copper has a charge of 2+)

Cu+ AgNO3 → Ag + _____

a)

Cu(NO3)2

b)

CuNO3

c)

CuAg

d)

Cu

13.

What type of reaction is this?

2 C6H14 + 19 O2 → 12 CO2 + 14 H2O

a)

Single Replacement

b)

Double Replacement

c)

Combustion

d)

Decomposition

14.

Predict the products for the this Single Replacement reaction:

K + HCl →

a)

KCl + H2

b)

KHCl

c)

KH + Cl2

d)

HCl + K2

15.

Predict the products for the this Double Replacement reaction:

AgNO3 + KCl →

a)

AgCl + KNO3

b)

AgK + ClNO3

c)

KAg + NO3Cl

d)

AgCl + 3 KNO

16.

Complete the balanced equation for this Double Replacement reaction.

3 NaOH + Fe(NO3)3 →

a)

NaFe + OH(NO3)3

b)

NaNO3 + Fe(OH)3

c)

3 NaNO3 + Fe(OH)3

d)

3 NaFe + 3 (OH)NO3

17.

Predict the products for the this Single Replacement reaction: (Copper has a charge of 1+)

Mg + CuCl →

a)

MgCl2 + Cu

b)

Mg + Cu

c)

MgCu + Cl2

d)

MgCl + Cu2

18.

What are the products of this reaction:

C2H4 + O2 →

a)

C2O2 + H4

b)

CO2 + H2 + O2

c)

CO + H

d)

CO2 + H2O

19.

Predict the products of this single replacement reaction: Na + H2O →

a)

NaO + H2

b)

NaOH + H2

c)

NaH + O2

d)

ONaH

20.

The symbol for a substance dissolved in solution is ______

a)

(s)

b)

(l)

c)

(aq)

d)

(g)

21.
Predict the products for the following reactants.
Mg + I2 --> 
a)
MgI
b)
MgI2
c)
Mg + I2
d)
Mg2I
22.
Predict the products for the following reactants.

K2CO3 + BaCl2 -->
a)
No Reaction
b)
KCl + BaCO3
c)
K2Cl + BaCO3
d)
KCl2 + BaCO3
23.

What will be the result of sodium reacting with water?

a)

NaOH and H2O will be produced

b)

Na2O + H2 will be produced

c)

NaOH and H2 will be produced

d)

NaOH will be produced

24.
In writing a chemical equation that produces hydrogen gas, the correct representation of hydrogen gas is
a)
2H
b)
OH
c)
H
d)
H2
25.
To predict if a single replacement reaction will take place you should use a(n)
a)
Activity series
b)
Solubility Chart
c)
Periodic Table
d)
Metal chart
26.

To predict if a double replacement reaction will take place you should use a(n)

a)

Activity series

b)

Solubility Chart

c)

Periodic Table

d)

Metal chart

27.
What is the name for the solid formed during a reaction?
a)
Precipitate
b)
Rocks
c)
Bubbles
d)
Aqueous 
28.

Always the products of a combustion reaction...

a)

CO2 + H2O

b)

CO2 + H2O2

c)

O2 + a carbon compound

d)

H(OH) + a salt

29.

Based on the activity series, what are the predicted products of this reaction?

Br2 (l) + KI (aq) →

a)

KBr + I2

b)

KBr + I

c)

KBr2 + I

d)

No Reaction

30.

Based on the activity series, will this reaction occur?

Au (s) + HCl (l) →

a)

AuCl + H

b)

No Reaction

c)

AuCl + H2

d)

Au2Cl + H2

31.

Predict the product(s) of this reaction (don't worry about balancing):

Mg + HCl →

a)

No Reaction

b)

MgCl2 + H2

c)

MgCl2 + H

d)

MgCl + H2

32.

What will be the result of the following:

LiBr + Na --->

a)

Li will replace Na

b)

Na will replace Br

c)

Na will replace Li

d)

no reaction will occur

33.

What will be the result of : Zn + AuCl2->

a)

ZnCl2 +Au

b)

ZnAu + Cl2

c)

no reaction

d)

ClAu + Zn

34.

What are the products of this reaction: Fe + Na2CO3 ?

a)

Na2 + Fe(CO3)2

b)

Na + CO3Fe

c)

Na + Fe2CO3

d)

No Reaction

35.

Which element is higher in reactivity, Ag or Ca?

a)

Ag

b)

Ca

c)

Neither

d)

They're equal

36.

What are the products of this single replacement reaction: Mg + CuSO4

a)

Cu + MgSO4

b)

Cu + SO4Mg

c)

Cu + Mg(SO4)2

d)

No Reaction

37.
What do we look at to determine if an element is strong enough to replace another element in a single replacement reaction?
a)
Solubility Rules 
b)
Ionic Charges
c)
It must be insoluble!
d)
Activity Series
38.

Based on the activity series, which metal could X represent in the reaction below?

X + Ca (NO3)2 --> Ca + X (NO3)2

a)

Ba

b)

Fe

c)

Mg

d)

Zn

39.

Which reaction occurs

a)

Ag + KNO3 ------> K + AgNO3

b)

K + AgNO3 ------> Ag + KNO3

40.

Which reaction occurs

a)

2Li (s) + 2H2O (l) -----> 2LiOH (aq) + H2 (g)

b)

2 LiOH (aq) + H2 (g) -------> 2 Li (s) + 2 H2O (l)

41.
Magnesium reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas this happens because? 
a)
Magnesium is higher on the reactivity series then hydrogen
b)
magnesium is more reactive than hydrogen
c)
magnesium is able to break the bond between HCl and form MgCl2
d)
both b and c are correct
42.

Determine the result of the following potential reaction (formulas must be correct).

Bi(OH)2 + Ni →

a)

BiNi + H2O

b)

Bi + NiOH

c)

Bi + Ni(OH)2

d)

no reaction

43.

Determine the result of the following potential reaction (formulas must be correct).

AgF + Cl2 →

a)

AgCl + F2

b)

Ag + ClF

c)

AgF2 + Cl2

d)

no reaction

44.

Determine the result of the following potential reaction (formulas must be correct).

CuCl2 + Ba →

a)

Cu + BaCl

b)

Cu + BaCl2

c)

BaCu + Cl2

d)

no reaction

45.

Determine the result of the following potential reaction (formulas must be correct).

Mn + Al(NO3)3 →

a)

Mn(NO3)3 + Al

b)

Al + Mn(NO3)4

c)

Al + MnNO3

d)

no reaction

46.

Determine the result of the following potential reaction (formulas must be correct).

Al + Mn(NO3)4 →

a)

AlNO3 + Mn

b)

Al(NO3)3 + Mn

c)

Al(NO3)4 + Mn

d)

no reaction

47.

Determine the result of the following potential reaction (formulas must be correct).

LiF + Cl2 →

a)

Li + ClF2

b)

LiCl + F

c)

LiCl2 + F2

d)

no reaction

48.

Determine the result of the following potential reaction (formulas must be correct).

Ca + H2O(g) →

a)

CaOH and H2

b)

Ca(OH)2 and H2

c)

CaH2O6

d)

no reaction

49.

Determine the result of the following potential reaction (formulas must be correct).

Ni + H2O(g) →

a)

NiOH and H2

b)

Ni(OH)2 and H2

c)

NiH2O6

d)

no reaction

50.

Determine the result of the following potential reaction (formulas must be correct).

Cobalt + Hydrochloric Acid →

a)

CoCl2 + H2

b)

CoH2 + Cl2

c)

CoCl + H

d)

no reaction

51.

Based on the activity series, will this reaction occur?

Au (s) + HCl (l) →

a)

AuCl + H

b)

No Reaction

c)

AuCl + H2

d)

Au2Cl + H2

52.

Predict the product(s) of this reaction (don't worry about balancing):

Mg + HCl →

a)

No Reaction

b)

MgCl2 + H2

c)

MgCl2 + H

d)

MgCl + H2

53.

Predict the product(s) of this reaction (Don't worry about balancing)

Pb(NO3)2 + KI →

a)

PbK(s) + INO3(aq)

b)

No Reaction

c)

PbI2(s) + KNO3(aq)

d)

PbI2(aq) + KNO3(s)

54.

Which one of the following would result in a reaction?

a)

Iron with magnesium chloride

b)

magnesium with iron chloride

c)

Iron with Zinc Sulphate

d)

gold with silver nitrate

55.
Which of the following metals is the most reactive according to the reactivity series of metals.
a)
Copper
b)
Zinc
c)
Magnesium 
d)
Lithium
56.
Which of the following will not undergo reaction?
a)
zinc metal  +  zinc oxide 
b)
iron metal  +  copper oxide
c)
zinc metal +  iron oxide
d)
magnesium  +  iron oxide
57.

Which metal is more reactive than calcium?

a)

magnesium

b)

potassium

c)

silver

d)

aluminum

58.
What will be the result if a less reactive metal is added in a solution with more reactive metal compound?
a)
vigorous reaction
b)
fizzing gas produced
c)
burns moderately
d)
no reaction
59.

Will silver react with magnesium chloride solution?

a)

yes

b)

no

60.

Which compound is higher in reactivity, Ag or Ca?

a)

Ag

b)

Ca

c)

Neither

d)

They're equal

61.

A list of elements that organizes them in order of their reactivity is called

a)

Negativity Series

b)

Netflix Series

c)

Activity Series

d)

Displacement Series

62.

If single element is above the element in compound, then the reaction ________________occur.

a)

will

b)

will not

63.

What will be the result of the following:

LiBr + Na ->

a)

Li will replace Na

b)

Na will replace Br

c)

Na will replace Li

d)

no reaction will occur

64.

What will be the result of : Zn + AuCl2->

a)

ZnCl2 +Au

b)

ZnAu + Cl2

c)

no reaction

d)

ClAu + Zn

65.

Will silver react with magnesium chloride solution?

a)

yes

b)

no

66.

What would result for the following reaction:

magnesium + silver nitrate -->

a)

no reaction

b)

magnesium nitrate + silver

c)

nitrate + silver magnesium

67.
The following is what type of reaction:
PbCl2 + AgNO3 → Pb(NO3)2 + AgCl
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
68.
The following is what type of reaction:
NH3 + HCl  → NH4Cl
a)
Synthesis
b)
Decomposition
c)

Single Replacement

d)

Double Replacement

69.
What is decomposition?
a)
putting substances together
b)
breaking substances apart
c)
element replacing another element in a compoud
d)
burning of a subtance
70.
What type of chemical reaction is this?
Al(OH)3 → Al2O3  + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement 
71.

In this type of reaction, ions in two compounds switch. 

a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
72.

Ca + AlCl3 --> CaCl2 + Al

a)
Synthesis
b)
Decomposition
c)

Single Replacement

d)

Double Replacement

73.

In this type of reaction, one element replaces another in a compound.

a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
74.

In this type of reaction, one reactant turns into several different products.

a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
75.

This 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
76.
Two Reactants and One Product
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Single Replacement
77.

What type of reaction is being demonstrated in this picture?

a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
78.

Si   + S8   -->   Si2S4

a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
79.
C4H12 + O2 → CO2 + H2O
a)
Synthesis
b)
Combustion
c)
Single Replacement
d)
Double Replacement
80.

Pb(NO3)2   -->   PbO +  NO2  +  O2

a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Combustion
81.

KOH + H3PO4 --> K3PO4 + H2O

a)
Synthesis 
b)
Decomposition
c)

Single replacement

d)

Double replacement

82.

What type of reaction involves the breaking down of a substance into simpler substances?

a)

Single Replacement Reaction

b)

Double Replacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

83.

What type of reaction involves 2 substances combining to form 1 new compound?

a)

Decomposition Reaction

b)

Single Replacement Reaction

c)

Double Replacement Reaction

d)

Synthesis Reaction

84.

What type of reaction involves one element replacing another element in a compound?

a)

Single Replacement Reaction

b)

Double Replacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

85.

What type of reaction involves ions from 2 compounds exchanging places to form 2 completely new compounds?

a)

Single Replacement Reaction

b)

Double Replacement Reaction

c)

Synthesis Reaction

d)

Decomposition Reaction

86.

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

87.

What are the products of the chemical reaction pictured?

a)

CH4 and CO2

b)

CH4 and O2

c)

CO2 and H2O

d)

O2 and H2O

88.

What type of chemical reaction is this one?

Al(OH)3 --> Al2O3 + H2O

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Single Replacement

89.

What type of chemical reaction is this one?

CUO + CO2 --> CuCO3

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Single Replacement

90.

What type of chemical reaction is this one?

Ca + MgCl2 --> CaCl2 + Mg

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Single Replacement

91.

3KOH + H3PO4 --> K3PO4 + 3H2O

a)

Combination

b)

Decomposition

c)

Single replacement

d)

Double replacement

92.
CxHy +O2 --> H2O + CO2
a)
Decomposition
b)
Double replacement
c)
Combustion
d)
Single Replacement
93.
Pb(NO3)2 --> PbO + NO2 + O2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
94.

Combustion reactions will always involve

a)

Oxygen and a solid

b)

Liquid nitrogen and heat

c)

Oxygen and heat/energy

d)

CO and H2O

95.

When Lead Nitrate reacts with potassium iodide, Yellow precipitate of ............. is formed

a)

PbI2

b)

KNO3

c)

Pb(NO3)2

d)

PbIO3

96.

Balancing this reaction:

____ CH4 + ____ O2 ---> ___ CO2 + ____ H2O

a)

2,1,3,1

b)

1,2,1,2

c)

1,2,2,1

d)

2,1,1,2

97.

Balance this reaction:

____ Na3PO4 + ____ KOH ---> ____ NaOH + ____ K3PO4

a)

1,3,3,1

b)

1,3,2,1

c)

2,3,3,1

d)

1,1,3,1

98.

Balance this reaction:

____ NaF + ____ Br2 ---> ___ NaBr + ____ F2

a)

3,1,2,1

b)

1,2,3,4

c)

2,1,2,1

d)

1,2,1,2

99.
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
100.
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
101.

Two chemicals reacted and one of the products stays dissolved in the solution. What symbol is used to indicate this?

a)

(s)

b)

(l)

c)

(aq)

d)

(g)

102.

Predict the products for this substance: Al2O3 → ? + ?

a)

Al + O2

b)

O2 + Al3

c)

Al2 + O3

d)

Al + O

e)

Al3 + O

103.

Predict the products if Calcium Carbonate reacts with Silver Sulfate.

CaCO3 + Ag2SO4 → ?

a)

Ag2CO3 + Ca2SO4

b)

AgCO3 + CaSO4

c)

CaSO4 + Ag2CO3

d)

Ag(CO3)2 + CaSO4

104.

In a reaction, Barium Chloride reacts with Potassium Carbonate to produce Barium Carbonate and Potassium Chloride. Determine the solubility of each product. Which answer choice correctly states one of the products?

a)

BaCl2 (aq)

b)

KCl (s)

c)

BaCO3 (s)

d)

K2CO3 (aq)

e)

BaCO3 (aq)

105.

If Ethylene (C2H4) reacts with Oxygen gas in a chemical reaction, what are the products?

a)

C2O2 + H4

b)

CO2 + H2 + O2

c)

CO + H2

d)

CO2 + H2O

106.

Barium Bromide reacts with Lithium Phosphate to yield Lithium Bromide and Barium Phosphate. What substance forms the precipitate in this reaction?

a)

Lithium Phosphate

b)

Lithium Bromide

c)

Barium Bromide

d)

Barium Phosphate

107.
What are the products of this reaction?
Cu+ AgNO3--> 
a)
Cu(NO3)2+Ag
b)
CuNO3 + Ag
c)
CuAg+NO3
d)
Cu+ AgNO3
108.
Write a Balanced Equation for this reaction:
C2H4 + 2 O2 -->
a)
C2O2 + H4
b)
CO2 + HOH
c)
CO + H
d)
2 CO2 + 2H2O
109.
What are the correct formulas and coefficients for the products of the following single-replacement reaction?
Mg + Al(OH)3 →
a)
No Reaction
b)
Al + Mg(OH)3
c)
2 Al + 3 Mg(OH)2
d)
3 Al + MgOH3
110.
If an element is diatomic it should have a subscript of___
a)
2, always
b)
2, only when it is by itself
c)
it shouldn't have a subscript, it should have a coefficent
111.
What kind of reaction is this:
4Fe  +  3O2 →   2Fe2O3 
a)
Synthesis
b)
Decomposition
c)
Single Replacement 
d)
Double Replacement
112.
What kind of reaction is this:
2H2O2 →2 H2O + O2
a)
Synthesis
b)
Decomposition
c)
Single Replacement 
d)
Combustion
113.
What kind of reaction is this:
Fe + CuSO4 -> Cu + FeSO4
a)
Double Replacement
b)
Decompostion
c)
Single Replacement
d)
Combustion
114.
in a reaction, aqueous barium chloride reacts with aqueous potassium carbonate to produce solid barium carbonate and aqueous potassium chloride. what is the correct balanced equation.
a)
Ba2Cl(aq) + KCO3(aq) --> BaCO3(s) + KCl(aq)
b)
BaCl2(aq) + K2CO3(aq) --> BaCO3(s) + 2KCl(aq)
c)
BaCl(aq) + K2CO3(aq) --> BaCO3(s) + K2Cl(aq)
d)
Ba2Cl2(aq) + KCO3(aq) --> Ba2CO3(s) + KCl2(aq)
115.

What are the products of this reaction?

Cu2+ + AgNO3 →

a)

Cu(NO3)2 + Ag

b)

CuNO3 + Ag

c)

CuAg + NO3

d)

Cu + AgNO3

116.

Write a balanced reaction for this reaction [Zn has a charge of 2+]

Zn(s) + H2S(aq) →

a)

ZnS + H

b)

ZnS + H2

c)

ZnS2 + H

d)

Zn2S + H2

117.

Write a balanced equation for this DR reactions

NaOH + Fe(NO3)3 -->

a)

NaFe + OH(NO3)3

b)

2NaNO3 + 3Fe(OH)3

c)

NaNO3 + FeOH

d)

3NaNO3 + Fe(OH)3

118.
Predict the products for the this reaction:
K + HCl --> 
a)
KCl + H2
b)
KHCl 
c)
KH + Cl2
d)
KCl + H
119.

Predict the products for the this reaction:

Mg + CuCl2 →

a)

MgCl2 + Cu

b)

MgCl + Cu

c)

MgCu + Cl2

d)

CuMg + Cl2

120.

Predict the products for the this reaction: [Ag has a charge of 1+]

Ag3N + KCl →

a)

AgCl + K3N

b)

AgK + ClN3

c)

AgN3 + KCl

d)

KAg + N3Cl

121.

What are the correct formulas and coefficients for the products of the following single-replacement reaction?

Ag + K2SO4 →

a)

No Reaction

b)

K2 + AgSO4

c)

2K + Ag(SO)4

d)

2K + AgSO4

122.

What is the left part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical equation

123.

What is the right part of a chemical equation called?

2H2 + O2 ---> 2H2O

a)

Reactants

b)

Yields

c)

Products

d)

Chemical Equation

124.

How many Mn atoms are found in the following compound?

2MnO4

a)

1

b)

2

c)

4

d)

8

125.

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

Example: H2

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

126.

Is the following equation balanced?

Al + O2 ---> 2Al2O3

a)

YES

b)

NO

127.

What is the number before a chemical formula called?

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

a)

Coefficient

b)

Atom

c)

Subscript

d)

Equation

128.

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

129.

Balance this equation:

H2 + Cl2 ---> HCl

a)

It is balanced.

b)

H2 + Cl2 ---> 2HCl

c)

3H2 + Cl2 ---> 6HCl

d)

H2 + 3Cl2 ---> 6HCl

130.

Balance this equation:

HgO ---> 2Hg + O2

a)

It is balanced.

b)

2HgO ---> 2Hg + O2

c)

2HgO ---> Hg + O2

d)

HgO ---> Hg + 2O2

131.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number in front of a chemical formula.
c)
The number in between the chemical symbols.
d)
The number behind a chemical formula.
132.
How many HCl molecules do you need to balance this equation? 
Mg +  __HCl --->  MgCl2 + H2
a)
1
b)
2
c)
3
d)
4
133.
What are the smaller numbers that you CANNOT change in a chemical equation? 
a)
Coefficient
b)
Products
c)
Reactants
d)
Subscript
134.

Balance the following equation:

___ H2+ ___ O2→___ H2O

a)

1, 1, 3

b)

2, 2, 2

c)

1, 2, 1

d)

2,1, 2

135.
Is the equation balanced?: 2H2O + O2 --> 4MgO + 3Fe
a)
Yes
b)
No
136.
Balance this equation
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
137.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
138.
Which problem is balanced?
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
139.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
140.
Is this balanced?...
Fe + S --> FeS
a)
YES!
b)
NO!
141.
Balance this equation-
__P4 + __O2 --> __P2O3
a)
it is already balanced
b)
2, 1, 3
c)
1, 2, 3
d)
1, 3, 2
142.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
143.
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
144.

Zn + H2SO4 --> ZnSO4 + bubbles of H2. What indicator of a chemical reaction is described?

a)

color change

b)

gas formation

c)

precipitate formation

d)

endothermic transfer of energy

145.
When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?
a)
a change of color
b)
a change of state
c)
a temperature decrease
d)
a temperature increase

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