WorksheetsU6 Chemical Reactions
Total questions: 74
Worksheet time: 6hrs 10mins
Name
Class
Date
1.
In the chemical equation 2Mg + O2 --> 2MgO, the MgO is a
a)
reactant.
b)
product.
c)
coefficient.
d)
subscript.
2.
A balanced chemical equation must have the same number of ____ on both sides of the equation.
a)
atoms
b)
reactants
c)
products
d)
compounds
3.
Which of the following is NOT a balanced equation?
a)
CuCl2 + H2S --> CuS + 2HCl
b)
Ag(NO3) + NaI --> AgI + Na(NO3)
c)
2C2H6 + 7O2 --> 4CO2 + 6H2O
d)
MgO + Fe --> Fe2O3 + Mg
4.
When the equation ____Fe + ____O2 --> ____Fe2O3 is balanced, the coefficient for O2 is
a)
1.
b)
2.
c)
3.
d)
4.
5.
In the chemical equation 2H2O2 --> 2H2O + O2, the H2O2 is a
a)
reactant.
b)
product.
c)
spectator ion.
d)
coefficient.
6.
When the equation ____Ba + ____HCl --> ____BaCl2 + ____H2 is balanced, the coefficient for HCl is
a)
6.
b)
3.
c)
2.
d)
1.
7.
When the equation ____Al2O3 --> ____Al + ____O2 is balanced, the coefficient for Al2O3 is
a)
1.
b)
2.
c)
3.
d)
4.
8.
Which of the following is a balanced chemical equation?
a)
MgF2 + Li2CO3 --> MgCO3 + LiF
b)
CH4 + 2O2 --> CO2 + H
c)
2Al + 6HCl --> 3H2 + AlCl3
d)
P4 + 3O2 --> 2P2O3
9.
Which of the following is the correctly balanced equation for P4 + O2 --> P4O10?
a)
P4 + O10 --> P4O10
b)
2P4 + 5O2 --> P4O10
c)
5P4 + O2 --> (P4O2)5
d)
P4 + 5O2 --> P4O10
10.
Which of the following is the correctly balanced equation for Na + HCl --> H2 + NaCl?
a)
Na + 4HCl --> 2H2 + 4NaCl
b)
Na + 2HCl --> H2 + NaCl2
c)
Na + HCl --> H + NaCl
d)
2Na + 2HCl --> H2 + 2NaCl
11.
An equation is balanced by
a)
changing subscripts.
b)
adding coefficients.
c)
erasing elements as necessary.
d)
adding elements as necessary.
12.
What are the reactants in the following equation?
Zn + CuSO4 --> ZnSO4 + Cu
Zn + CuSO4 --> ZnSO4 + Cu
a)
Zn and Cu
b)
ZnSO4 and Cu
c)
Zn and CuSO4
d)
Zn only
13.
When the equation ____Mg + ____HCl --> ____MgCl2 + ____H2 is balanced, the coefficient for HCl is
a)
1.
b)
2.
c)
3.
d)
4.
14.
What are the missing coefficients for the following skeleton equation?
____N2 + ____H2 --> ____NH3
____N2 + ____H2 --> ____NH3
a)
1, 1, 2
b)
3, 1, 2
c)
1, 3, 2
d)
1, 3, 3
15.
What are the missing coefficients for the following skeleton equation?
____H2 + ____O2 --> ____H2O
____H2 + ____O2 --> ____H2O
a)
2, 2, 2
b)
2, 1, 2
c)
2, 0, 2
d)
1, 1, 1
16.
How many oxygen atoms are in 2NO3?
a)
2
b)
6
c)
3
d)
1
17.
How many oxygen atoms are in 4Al2(CO3)3?
a)
3
b)
9
c)
12
d)
36
18.
How many nitrogen atoms are in 7H(NO3)?
a)
7
b)
1
c)
3
d)
21
19.
The chemicals that are formed in a chemical reaction are called:
a)
reactants
b)
products
c)
neither
d)
both
20.
AB + CD →AD + CB
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
21.
Identify this type of reaction,
Cl2 + 2KI --> I2 + 2KCl
Cl2 + 2KI --> I2 + 2KCl
a)
Synthesis
b)
Single displacement
c)
Double displacement
d)
Decomposition
22.
2 C5H5 + Fe --> Fe(C5H5)2
a)
single displacement
b)
double displacement
c)
decomposition
d)
synthesis
23.
2 RbNO3 + BeF2 --> Be(NO3)2 + 2 RbF
a)
single displacement
b)
double displacment
c)
decomposition
d)
synthesis
24.
Which chemical reaction breaks down into 2 substances?
a)
Double displacement
b)
Single displacement
c)
Synthesis
d)
Decomposition
25.
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
26.
Which of the following is the general formula for a decomposition reaction?
a)
A + B → AB
b)
AB → A + B
c)
AB + C → AC + B
d)
AB + CD → AC + BD
27.
2 AgNO3 + Cu --> Cu(NO3)2 + 2 Ag
a)
single displacement
b)
double displacement
c)
decomposition
d)
synthesis
28.
A + BC →B + AC
a)
Single Replacement
b)
Decomposition
c)
Double Replacement
d)
Synthesis
29.
NO2 →N2 + O2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
30.
Mg + N2 →Mg3N2
a)
Synthesis (combination)
b)
Decomposition
c)
Single replacement
d)
Combustion
31.
2NaCl →2Na +Cl2
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
32.
C + O2 → CO2
a)
Synthesis Reaction
b)
Decomposition Reaction
c)
Single Displacement Reaction
d)
Double Displacement Reaction
33.
The following is what type of reaction:
NH3 + HCl → NH4Cl
NH3 + HCl → NH4Cl
a)
Synthesis
b)
Decomposition
c)
Single Replacement Replacement
d)
Double Replacement Replacement
34.
Which of the following is a sign that a chemical reaction has occurred?
a)
change in shape
b)
melting
c)
formation of a gas
d)
dissolving
35.
What kind of reaction is this:
4Fe + 3O2 → 2Fe2O3
4Fe + 3O2 → 2Fe2O3
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
36.
What kind of reaction is this:
2H2O2 →2 H2O + O2
2H2O2 →2 H2O + O2
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Combustion
37.
What kind of reaction is this:
2C3H7OH +9O2 -> 6CO2 + 8H2O
2C3H7OH +9O2 -> 6CO2 + 8H2O
a)
Double Replacement
b)
Combustion
c)
Single Replacement
d)
Decomposition
38.
What kind of reaction is this:
Fe + CuSO4 -> Cu + FeSO4
Fe + CuSO4 -> Cu + FeSO4
a)
Double Replacement
b)
Decompostion
c)
Single Replacement
d)
Combustion
39.
The reaction below is an example of?
AgNO3 + NaCl → AgCl + NaNO3
AgNO3 + NaCl → AgCl + NaNO3
a)
Single Replacement
b)
Double Replacement
c)
Decomposition
d)
Combustion
40.
This picture is an example of burning a hydrocarbon which is what type of reaction?
a)
Combustion
b)
Single Relplacement
c)
Double Replacement
d)
Decomposition
41.
What kind of reaction is this:
CaCO3 + Ag2SO4 → CaSO4 + Ag2CO3
CaCO3 + Ag2SO4 → CaSO4 + Ag2CO3
a)
Decomposition
b)
Single Replacement
c)
Double Replacement
d)
Combustion
42.
If you mixed NaCl and Pb(NO3)2 what solid would be produced?
a)
NaNO3
b)
PbCl2
c)
Na2Pb
d)
ClNO3
43.
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
44.
What are the coefficients if the following equation is properly balanced? Al + O2 → Al2O3
a)
4:3:2
b)
2:3:2
c)
2:1:1
d)
8:6:4
45.
Which of the following is NOT an indication of a chemical reaction?
a)
Formation of a precipitate
b)
Formation of a gas (bubbling)
c)
Heat is given off
d)
Mixing two chemicals together
46.
All chemical reactions must obey the Law of________
a)
conservation of mass
b)
conservation of energy
c)
both conservation of mass and energy
d)
neither conservation of mass or energy
47.
Predict the products: Na + KCl -->
a)
K and NaCl
b)
KNa and Cl
c)
NaKCl
d)
No reaction
48.
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
49.
When balanced, what are the coefficents for the following reaction:
H20 → H2 + O2
H20 → H2 + O2
a)
2:1:2
b)
2:1:1
c)
1:1:1
d)
2:2:1
50.
What coefficients would balance the synthesis of ammonia? N2 + H2 → NH3
a)
1:1:2
b)
1:2:2
c)
1:3:2
d)
2:6:4
51.
How many different types/classifications of Chemical Reactions have we learned about?
a)
3
b)
4
c)
5
d)
6
52.
What type of reaction occurs between an element and a compound?
Zn + 2HCl --> ZnCl2 + H2
Zn + 2HCl --> ZnCl2 + H2
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
53.
What kind of reaction is this:
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
54.
In a chemical reaction...
a)
atoms aren't rearranged
b)
atoms are rearranged
55.
This is used to represent the number of each atom being represented.
a)
An exponent
b)
The coefficient
c)
A molecule
d)
The subscript
56.
Is this balanced?
2HgO → 2Hg + O2
2HgO → 2Hg + O2
a)
Yes
b)
No
57.
Is this balanced?
Al + O2 → 2Al2O3
Al + O2 → 2Al2O3
a)
Yes
b)
No
58.
When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced
a)
charge
b)
subscript
c)
random number
d)
coefficient
59.
Balance this equation:
__Li + __Cl2 -> __LiCl
__Li + __Cl2 -> __LiCl
a)
2Li + Cl2 -> 4LiCl2
b)
2Li + Cl2 -> LiCl2
c)
2Li + Cl2 -> 2LiCl
60.
This appears on the left side of a chemical formula, and represents how many molecules there are.
a)
An Atom
b)
The Subscript
c)
A Molecule
d)
The Coefficient
61.
How many hydrogen atoms are in this chemical formula:
a)
4 hydrogen atoms
b)
1 hydrogen atom
c)
2 hydrogen atoms
d)
3 hydrogen atoms
62.
How many oxygen atoms are in this chemical formula?
a)
7 oxygen atoms
b)
4 oxygen atoms
c)
3 oxygen atoms
d)
1 oxygen atoms
63.
What is the left part of a chemical equation called?
H2 + O → H2O
H2 + O → H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
64.
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
65.
One of the signs of a chemical reaction taking place is:
a)
Bubbles are produced
b)
Reactants are not combining
c)
Products are not forming
d)
Colour is not changing
66.
Why must chemical equations be balanced?
a)
So that the equation doesn't explode
b)
The reaction won't happen until it is balanced
c)
Matter cannot be created or destroyed
d)
To make students work harder at chemistry & math.
67.
The arrow symbol used in a chemical equation is also known as..
a)
Yield sign
b)
Subscript
c)
Coefficient
d)
Chemical formula
68.
What coefficient should be used on the red line to make the following equation balanced?
N2+O2--> ___NO
N2+O2--> ___NO
a)
1
b)
2
c)
3
d)
4
69.
What is the type of reaction shown at the top?
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
70.
This pictures simulates what type of reaction?
a)
Synthesis
b)
Decomposition
c)
Single Replacement
d)
Double Replacement
71.
Identify the type of reaction: 3Ca + 2AlCl3 --> 3CaCl2 + 2Al
a)
Synthesis
b)
Decomposition
c)
Single diplacement
d)
Double displacement
72.
Identify the type of reaction: 4Si + S8 --> 2Si2S4
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Double displacement
73.
Identify the type of reaction: 2NO2 --> N2 + 2O2
a)
Synthesis
b)
Decomposition
c)
Single displacement
d)
Combustion
74.
Which of the following is the general formula for a decomposition reaction?
a)
A + B → AB
b)
AB → A + B
c)
AB + C → AC + B
d)
AB + CD → AC + BD
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