WorksheetsCombining Chemical Reactions
Total questions: 28
Worksheet time: 18mins
Name
Class
Date
1.
In a chemical reaction what quantity is conserved?
a)
Mass
b)
Number of Atoms
c)
Number of Compounds
d)
Both Mass and Number of Atoms
2.
In the equation, 2Mg + O2 ---> 2MgO, which are the reactants?
a)
Mg and O
b)
MgO
c)
Mg and MgO
d)
O and MgO
3.
In chemical reactions, the law of conservation of mass is......
a)
disobeyed
b)
does not apply
c)
obeyed
d)
used sometime
4.
Balance this equation, Ca + H2O --> CaO + H2
a)
Ca + 2H2O --> CaO + 2H2
b)
2Ca + H2O --> CaO + H2
c)
Ca + H2O --> CaO + H2
d)
Cannot be balanced
5.
Balance this equation, Al2O3 ---> Al + O2
a)
Cannot be balanced
b)
2Al2O3 ---> 2Al + 3O2
c)
2Al2O3 ---> 4Al + 3O2
d)
3Al2O3 ---> 2Al + O2
6.
What type of reaction is this: CO2 + H2O --> H2CO3
a)
Decomposition
b)
Single Replacement
c)
Synthesis
d)
Combustion
7.
What type of reaction is this, C4H12 + O2 --> H2O + CO2
a)
Decomposition
b)
Single Replacement
c)
Double Replacement
d)
Combustion
8.
What type of reaction is this: Cl2 + 2KI --> I2 + 2KCl
a)
Synthesis
b)
Single Replacement
c)
Double Replacement
d)
Decomposition
9.
When a metal reacts with an acid what gas is formed? ex HCl + Zn --->
a)
H
b)
H2
c)
Cl2
d)
H2O
10.
Balance this equation: H2 + N2 → NH3
a)
H2 + 4N2 → NH3
b)
H2 + 3N2 → 2NH3
c)
3H2 + N2 → 2NH3
d)
2H2 + 2N2 → 2NH3
11.
Which is a Synthesis Reaction?
a)
A + B ----> AB
b)
AB -----> A + B
c)
AB + CD ----> AC +BC
d)
AB+ C ----> AC + B
12.
Which is a Decomposition Reaction?
a)
AB --> A + B
b)
ab ----> a + B
c)
AB + CD ----> AC +BC
d)
AB+ C ----> AC + B
13.
A reaction that occurs when two or more elements or compounds combine to make a more complex substance is called
a)
double replacement
b)
decomposition
c)
synthesis
d)
single replacement
14.
Balance this equation: H2 + N2 → NH3
a)
H2 + 4N2 → NH3
b)
H2 + 3N2 → 2NH3
c)
3H2 + N2 → 2NH3
d)
2H2 + 2N2 → 2NH3
15.
Occurs when one element replaces another one in a compound
a)
Synthesis
b)
Single replacement
c)
Double replacement
d)
Decomposition
16.
Compounds break down into simpler substances in this type of reaction.....
a)
Double Replacement
b)
Single Replacement
c)
Synthesis
d)
Decomposition
17.
This image represents
a)
a double replacement reaction
b)
a decomposition reaction
c)
a single replacement reaction
d)
a complex compound reaction
18.
This picture represents
a)
Synthesis
b)
Double Replacement
c)
Single Replacement
d)
Decomposition
19.
Hydrocarbon + Oxygen = Carbon Dioxide + Water
a)
Decomposition
b)
Combustion
c)
Single Replacement
d)
Double Replacement
20.
Balance the following reaction: _AgNO3 + _Cu--->_Cu(NO3)2 + _Ag
a)
2 AgNO3 + 2 Cu---> 3 Cu(NO3)2 + 1 Ag
b)
2 AgNO3 + 1 Cu---> 1 Cu(NO3)2 + 2 Ag
c)
1 AgNO3 + 2 Cu--->2 Cu(NO3)2 + 1 Ag
d)
3 AgNO3 + 2 Cu--->3 Cu(NO3)2 + 2 Ag
21.
Balance the following chemical reaction: _CoBr3+_CsOH--> _Co(OH)3+_CsBr
a)
2,3,2,3
b)
3,1,3,1
c)
2,6,2,6
d)
1,3,1,3
22.
Which of the following chemical reactions is balanced correctly?
a)
3BaBr2+2Mg3PO4 --> Ba3(PO4)2+ 6MgBr
b)
F2+4NaSH--> 2NaF+S2+H2S
c)
Al2(Cr2O7)3+6NH4Cl--> 2AlCl3+3(NH4)2Cr2O7
d)
Rb+Cl2-->3RbCl
23.
NaI +BaCl2 -----> NaCl +BaI2 is an example of?
a)
Combustion
b)
Single replacement
c)
Double replacement
d)
Decomposition
24.
Name this reaction: NaI +Cl2 -----> NaCl +I2
a)
combustion
b)
Single replacement
c)
Double replacement
d)
Synthesis
25.
CaO +Mg -----> MgO +Ca ,This is an example of what reaction type?
a)
Double displacement
b)
Single displacement
c)
Synthesis
d)
Combustion
26.
Which of the following state symbols represents something dissolved in water?
a)
aq
b)
s
c)
l
d)
g
27.
A product that is a precipitate gets what state symbol?
a)
l
b)
g
c)
s
d)
aq
28.
What state symbol would water vapor get in a reaction?
a)
s
b)
l
c)
g
d)
aq
100 %
