WorksheetsChemistry Chemical Reactions Review
Total questions: 80
Worksheet time: 2hrs 18mins
Name
Class
Date
1.
Balance this equation...
HgO --> Hg + O2
HgO --> Hg + O2
a)
It is balanced
b)
2HgO --> Hg + O2
c)
2HgO --> 2Hg + O2
d)
I don't know...Oh well!
2.
What is the right part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
3.
Substances that enter into a chemical reaction (found to the left side of the arrow)
a)
product
b)
reactant
c)
chemical
d)
balanced equation
4.
A compound that contains only carbon and hydrogen and that produces CO2 and H2O when burned is called a(n)
a)
binary compound
b)
carbonate
c)
ionic compound
d)
hydrocarbon
5.
Predict the products for the decomposition of potassium chlorate: KClO3
a)
KCl + O2
b)
K2O + Cl2
c)
K + ClO3
d)
K + ClO2
6.
Predict the products for the decomposition of calcium carbonate: CaCO3
a)
CaO + CO2
b)
Ca + CO3
c)
CaCO2 + O2
d)
CaO + CO3
7.
Predict the products for the this reaction:
K + HCl -->
K + HCl -->
a)
KCl + H2
b)
KHCl
c)
KH + Cl2
d)
KCl + H
8.
Predict the products for the this reaction:
Mg + CuCl2 -->
Mg + CuCl2 -->
a)
MgCl2 + Cu
b)
MgCl + Cu
c)
MgCu + Cl2
d)
CuMg + Cl2
9.
Predict the products for the this reaction:
Mg + CuCl2 -->
Mg + CuCl2 -->
a)
MgCl2 + Cu
b)
MgCl + Cu
c)
MgCu + Cl2
d)
CuMg + Cl2
10.
Predict the products for the this reaction:
AgNO3 + KCl -->
AgNO3 + KCl -->
a)
AgCl + KNO3
b)
AgK + ClNO3
c)
AgNO3 + KCl
d)
KAg + NO3Cl
11.
What type of reaction is this?
2 C6H14 + 19 O2 --> 12 CO2 + 14 H2O
2 C6H14 + 19 O2 --> 12 CO2 + 14 H2O
a)
Single Replacement
b)
Double Replacement
c)
Combustion
d)
Decomposition
12.
The word equation for combustion is: fuel + oxygen --> water + ________ __________
a)
Carbon dioxide
b)
Limewater
13.
In the reaction of K + AgNO3 what will the products be?
a)
K and AgNO3
b)
Ag and KNO3
c)
NO3 and AgK
d)
No reaction
14.
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
15.
The symbol for a substance dissolved in water is
a)
(s)
b)
(l)
c)
(g)
d)
(aq)
16.
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
17.
Which of the following equations represents the balanced synthesis reaction of iron (III) and oxygen?
a)
Fe + 3 O2 → Fe2O3
b)
3 Fe + 3 O2 → 2 Fe2O3
c)
2 Fe + O2 → Fe2O3
d)
4 Fe + 3 O2 → 2 Fe2O3
18.
What are the correct formulas and coefficients for the products of the following single-replacement reaction?
Mg + Al(OH)3 →
Mg + Al(OH)3 →
a)
No Reaction
b)
Al + Mg(OH)3
c)
2 Al + 3 Mg(OH)2
d)
3 Al + MgOH3
19.
A compound that contains only carbon and hydrogen and that produces CO2 and H2O when burned is called a(n)
a)
binary compound
b)
carbonate
c)
ionic compound
d)
hydrocarbon
20.
How many different types/classifications of Chemical Reactions have we learned about?
a)
3
b)
4
c)
5
d)
6
21.
What is this reaction?
Zn + HCl --> ZnCl2 + H2
Zn + HCl --> ZnCl2 + H2
a)
decomposition
b)
single replacement
c)
synthesis
d)
double replacement
22.
What is this reaction?
N2 + O2 + H2O --> HNO3
N2 + O2 + H2O --> HNO3
a)
single replacement
b)
double replacement
c)
synthesis
d)
combustion
23.
What is this reaction?
NaCl+AgNO3>NaNO3+AgCl
NaCl+AgNO3>NaNO3+AgCl
a)
single replacement
b)
double replacement
c)
synthesis
d)
decomposition
24.
What is this reaction?
Zn + CuCl2--> ZnCl2 + Cu
Zn + CuCl2--> ZnCl2 + Cu
a)
synthesis
b)
single replacement
c)
double replacement
d)
decomposition
25.
What reaction is this?
H2CO3--> H2O + CO2
H2CO3--> H2O + CO2
a)
synthesis
b)
decomposition
c)
single replacement
d)
combustion
26.
What is this reaction?
H2SO3--> H2O + SO3
H2SO3--> H2O + SO3
a)
synthesis
b)
decomposition
c)
single replacement
d)
combustion
27.
What reaction is this?
Na + Cl --> NaCl
Na + Cl --> NaCl
a)
single replacement
b)
decomposition
c)
synthesis
d)
double replacement
28.
What reaction is this?
Zn + I2 --> ZnI2
Zn + I2 --> ZnI2
a)
synthesis
b)
decomposition
c)
single replacement
d)
combustion
29.
What reaction is this?
Fe2O3 + C --> Fe + CO2
Fe2O3 + C --> Fe + CO2
a)
synthesis
b)
double replacement
c)
decomposition
d)
single replacement
30.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
31.
What type of chemical reaction is this one?
Al(OH)3 --> Al2O3 + H2O
Al(OH)3 --> Al2O3 + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement
32.
What type of chemical reaction is this one?
CUO + CO2 --> CuCO3
CUO + CO2 --> CuCO3
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement
33.
What type of chemical reaction is this one?
Ca + MgCl2 --> CaCl2 + Mg
Ca + MgCl2 --> CaCl2 + Mg
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement
34.
The left side of the equation below is called
a)
Products
b)
Reactants
35.
The right side of the equation below is called the
a)
products
b)
reactants
36.
A + B > AB What type of chemical reaction is this?
a)
single
b)
double
c)
synthesis
d)
decomposition
37.
What type of chemical reaction is this one?
Al(OH)3 --> Al2O3 + H2O
Al(OH)3 --> Al2O3 + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement
38.
What type of reaction is illustrated below?
2HI --> H2 + I2
2HI --> H2 + I2
a)
synthesis
b)
decomposition
c)
single replacement
d)
double replacement
39.
What type of chemical reaction is this one?
CUO + CO2 --> CuCO3
CUO + CO2 --> CuCO3
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement
40.
What type of chemical reaction is this one?
C2H2 + O2 --> CO2 + H2O
C2H2 + O2 --> CO2 + H2O
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement
41.
The equation AX → A + X is the general equation for a
a)
single-displacement reaction
b)
combustion reaction
c)
decomposition reaction
d)
synthesis reaction
42.
The equation A + BX → AX + B is the general equation for a
a)
combustion reaction
b)
single-displacement reaction
c)
double-displacement reaction
d)
decomposition reaction
43.
The equation AX + BY → AY + BX is the general equation for a
a)
synthesis reaction
b)
decomposition reaction
c)
single-displacement reaction
d)
double-displacement reaction
44.
The equation Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) is an example of which type of reaction?
a)
combination reaction
b)
double-replacement reaction
c)
decomposition reaction
d)
single-replacement reaction
45.
Type of reaction?
NO2 --> N2 + O2
NO2 --> N2 + O2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
46.
When the following equation is balanced, what is the coefficient of oxygen molecules?
C5H10 + O2 → CO2 + H2O
a)
2
b)
5
c)
10
d)
15
e)
30
47.
What is the coefficient for aluminum after the following equation is balanced?
Al + O2 → Al2O3
a)
1
b)
2
c)
3
d)
4
e)
6
48.
What is the coefficient for calcium after the following equation is balanced?
Lithium + Calcium Nitrate → Lithium Nitrate + Calcium
a)
1
b)
2
c)
3
d)
4
e)
6
49.
What is the coefficient for sodium chloride after the following equation is balanced?
Manganese (II) Nitride + Sodium Chloride → Sodium Nitride + Manganese (II) Chloride
a)
1
b)
2
c)
3
d)
4
e)
6
50.
What is the coefficient for lithium oxide after the following equation is balanced? (Hint: PREDICT the products)
Lithium Oxide →
a)
1
b)
2
c)
3
d)
4
e)
6
51.
_Na3PO4+_KOH --->
_NaOH + _ K3PO4
_NaOH + _ K3PO4
a)
1 Na3PO4+3 KOH
--->
3 NaOH + 1 K3PO4
--->
3 NaOH + 1 K3PO4
b)
2 Na3PO4+2 KOH
--->
3 NaOH + 1 K3PO4
--->
3 NaOH + 1 K3PO4
c)
1 Na3PO4+2 KOH
--->
2 NaOH + 1 K3PO4
--->
2 NaOH + 1 K3PO4
d)
3 Na3PO4+3 KOH
--->
3 NaOH + 1 K3PO4
--->
3 NaOH + 1 K3PO4
52.
Balance this equation.
_CF4 + _Br2 -- _CBr4 + _F2
_CF4 + _Br2 -- _CBr4 + _F2
a)
2,1,2,1
b)
1,2,2,1
c)
1,2,1,2
d)
2,2,2,2
53.
Which of the following is an unbalanced equation?
(Check ALL answers)
(Check ALL answers)
a)
CaCO3 --> CaO + CO2
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 2O2 --> CO2 + 2SO2
54.
Which problem is balanced?
(Check ALL answers)
(Check ALL answers)
a)
PbO2 + 2H2
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
55.
_BaS + _PtF2
---> _BaF2 + _PtS
---> _BaF2 + _PtS
a)
1 BaS + 1 PtF2
--->
1 BaF2 + 1 PtS
--->
1 BaF2 + 1 PtS
b)
4 BaS + 2 PtF2
--->
1 BaF2 + 1 PtS
--->
1 BaF2 + 1 PtS
c)
1 BaS + 2 PtF2
--->
2 BaF2 + 2 PtS
--->
2 BaF2 + 2 PtS
d)
1 BaS + 3 PtF2
--->
1 BaF2 + 2 PtS
--->
1 BaF2 + 2 PtS
56.
Which coefficients balance this equation:
NH3 + O2 ----> NO + H2O
NH3 + O2 ----> NO + H2O
a)
2,3,5,6
b)
5,5,4,6
c)
4,6,4,5
d)
4,5,4,6
57.
Balance this equation.
_CH4 + _O2 --> _CO2 + _H2O
_CH4 + _O2 --> _CO2 + _H2O
a)
1,2,1,1
b)
2,1,2,1
c)
1,2,1,2
d)
0,2,0,2
58.
Balance this equation-
_SeCl6+_O2 ->_SeO2+_Cl2
_SeCl6+_O2 ->_SeO2+_Cl2
a)
1,2,1,2
b)
1,1,1,3
c)
1,2,1,1
d)
2,1,1,1
59.
Balance this equation.
_SnO2 +_H2-->_Sn +_H2O
_SnO2 +_H2-->_Sn +_H2O
a)
1,1,2,1
b)
1,2,1,1
c)
1,2,1,2
d)
1,2,2,1
60.
Balance this equation
_Al +_HCl --> _H2 +_AlCl3
_Al +_HCl --> _H2 +_AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
61.
Which of these are not diatomic molecules?
a)
Boron
b)
Iodine
c)
Nitrogen
d)
Oxygen
62.
Which reaction type is the following: C5H10 + O2 --> CO2 + H2O
a)
Decomposition
b)
Synthesis
c)
Combustion
d)
Double Replacement
63.
Which of the following is an example of synthesis?
a)
Na + Br2 --> NaBr
b)
KClO3 --> KCl + O2
c)
HgO + Cl2-->HgCl + O2
d)
Cl2 + NaBr --> NaCl + Br2
64.
Fill in the blank to balance the chemical equation.
2KI + ____Cl2 → 2KCl + I2
2KI + ____Cl2 → 2KCl + I2
a)
1
b)
2
c)
3
d)
4
65.
Fill in the blanks with coefficient:
PCl5+_ H2O→_ HCl+H3PO4
PCl5+_ H2O→_ HCl+H3PO4
a)
4, 5
b)
1, 6
c)
3, 8
d)
2,2
66.
Balance this equation.
_Mg + _Cl2 --> _MgCl2
_Mg + _Cl2 --> _MgCl2
a)
1, 2,1
b)
already balanced
c)
2,1,1
d)
1,1,2
67.
Balance this equation
_Zn+_HCl-->_ZnCl2 +_H2
_Zn+_HCl-->_ZnCl2 +_H2
a)
1,1,2,1
b)
1,1,1,2
c)
1,2,1,1
d)
2,1,1,1
68.
Balance this equation
_N2 + _H2 --> _NH3
_N2 + _H2 --> _NH3
a)
1,2,3
b)
1,3,2
c)
1,1,2
d)
2,1,1
69.
Finish a blalanced equation:
Mg(OH)2 --> __________
Mg(OH)2 --> __________
a)
Mg(OH)2 --> MgOH
b)
Mg(OH)2 --> MgO+ H2O
c)
Mg(OH)2 --> MgO+ H2
d)
Mg(OH)2 --> Mg+ H2O
70.
Balance this equation:
P4+O2 --> P2O3
P4+O2 --> P2O3
a)
3 P4+ O2 --> 2 P2O3
b)
P4+ O2 --> 2 P2O3
c)
P4+ 3 O2 --> 2 P2O3
d)
P4+ 2 O2 --> 3 P2O3
71.
Balance this equation,
Al2O3 --> Al + O2
Al2O3 --> Al + O2
a)
Cannot be balanced
b)
2Al2O3 --> 2Al+3O2
c)
2Al2O3--> 4Al+3O2
d)
3Al2O3--> 2Al+O2
72.
Balance the equation:
Si(OH)4+NaBr--> SiBr4+NaOH
Si(OH)4+NaBr--> SiBr4+NaOH
a)
Si(OH)4+2NaBr--> SiBr4+NaOH
b)
Si(OH)4+4NaBr--> SiBr4+4NaOH
c)
Si(OH)4+NaBr--> SiBr4+4NaOH
d)
Si(OH)4+2NaBr--> SiBr4+2NaOH
73.
Balance this equation:
2Li + Cl2 -> LiCl
2Li + Cl2 -> LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
74.
What are the coefficient used to balance the equation below?
__Ag2O →__ Ag +___O2
__Ag2O →__ Ag +___O2
a)
2,4,1
b)
1,1,1
c)
2,1,2
d)
2,2,2
75.
Balance this equation:
__ Al + __ HCl → __ H2 + __ AlCl3
__ Al + __ HCl → __ H2 + __ AlCl3
a)
2, 6, 3, 2
b)
it is already balanced
c)
4, 12, 3, 4
d)
2, 1, 4, 5
76.
Which of the Following Correctly Balances this Equation?
_H2+_Cl2 --> _HCl
_H2+_Cl2 --> _HCl
a)
2H2 + Cl2 --> 4HCl
b)
H2+Cl2 --> 2HCl
c)
3H2 + 3Cl2 --> HCl
d)
H + Cl --> HCl
77.
Which of the following is an unbalanced equation?
a)
CaCO3 --> CaO + CO2
b)
PbO2 + 2H2-->2Pb + H2O
c)
2Na+ 2H2O-->2NaOH + H2
d)
CS2 + 2O2 --> CO2 + 2SO2
78.
_P4+_O2 ---> _P2O3
a)
3 P4+1 O2 ---> 2 P2O3
b)
1 P4+1 O2 ---> 2 P2O3
c)
1 P4+ 3 O2 ---> 2 P2O3
d)
1 P4+ 2 O2 ---> 3 P2O3
79.
_NaF + _Br2
--->
_NaBr + _F2
--->
_NaBr + _F2
a)
1NaF + 2 Br2
--->
1 NaBr + 2 F2
--->
1 NaBr + 2 F2
b)
2NaF + 2 Br2
--->
2 NaBr + 2 F2
--->
2 NaBr + 2 F2
c)
2 NaF + 3 Br2
--->
1 NaBr + 2 F2
--->
1 NaBr + 2 F2
d)
2 NaF + 1 Br2
--->
2 NaBr + 1 F2
--->
2 NaBr + 1 F2
80.
CO + ___H2 --> CH4 + H2O
a)
1
b)
2
c)
3
d)
4
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