WorksheetsChemistry Sem Rev Practice Sp 1516 Chemical Reactions
Total questions: 25
Worksheet time: 33mins
Name
Class
Date
1.
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
2.
What type of chemical reaction is this one?
CUO + CO2 --> CuCO3
CUO + CO2 --> CuCO3
a)
Decomposition
b)
Combustion
c)
Synthesis
d)
Single Replacement
3.
What is a coefficient?
a)
The small number on the right of the chemical symbol.
b)
The large number to the left of a formula.
4.
Is the equation balanced?: 2H2 + 2O2 --> 2H2O
a)
Yes
b)
No
5.
What is a reactant?
a)
The chemical substances that begin the reaction.
b)
What comes from the reaction.
6.
Decomposition occurs when...
a)
Two formulas combine.
b)
A formula breaks apart.
c)
An atom is replaced during a reaction.
7.
What must go in the blank space to balance the equation?
4Fe + _O2 --> 2Fe2O3
4Fe + _O2 --> 2Fe2O3
a)
1
b)
2
c)
3
d)
4
8.
What coefficients are needed to correctly balance the equation?
_Bi + _O2 > _Bi2O3
_Bi + _O2 > _Bi2O3
a)
3,2,3
b)
2,3,2
c)
4,3,2
d)
none of these
9.
In a chemical equation, the substances that are on the right side of the arrow are the...
a)
reactants
b)
products
c)
catalysts
d)
inhibitors
10.
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)
None of these
11.
Which type of reaction is this?
2Na + Cl2 --> 2NaCl
2Na + Cl2 --> 2NaCl
a)
synthesis
b)
decomposition
c)
single displacement
d)
double displacement
12.
When a substance in a chemical equation is followed by (aq), it means that the substance is...
a)
a catalys
b)
dissolved in water
c)
a liquid
d)
a product
13.
Which type of chemical reaction is this?
2C2H6 + 5O2 --> 4CO2 + 6H2O
2C2H6 + 5O2 --> 4CO2 + 6H2O
a)
single displacement
b)
double displacement
c)
combustion
d)
synthesis
14.
Which type of reaction is this?
Br2 + 2KI --> 2KBr + I2
Br2 + 2KI --> 2KBr + I2
a)
synthesis
b)
decomposition
c)
single displacement
d)
double displacement
15.
How many atoms are there TOTAL in:
H2SO4
H2SO4
a)
6
b)
5
c)
7
d)
3
16.
How many elements are in C6H12O6?
a)
1
b)
2
c)
3
d)
4
17.
How many total atoms are in the compound C2H8O ?
a)
11
b)
2
c)
8
d)
1
18.
2H2 + O2 --------> 2H2O What are the reactants?
a)
----->
b)
2H2O
c)
2H2 +O2
19.
How is a gas indicated in a chemical equation?
a)
(g)
b)
(l)
c)
(s)
d)
(aq)
20.
What type of reaction is this?
2 AgNO3 + Ni --> Ni(NO3)2 + 2 Ag
2 AgNO3 + Ni --> Ni(NO3)2 + 2 Ag
a)
Single Replacement
b)
Synthesis
c)
Combustion
d)
Decomposition
21.
What type of reaction is this?
Ca(C2H3O2)2 + Na2CO3 --> CaCO3 + 2 NaC2H3O2
Ca(C2H3O2)2 + Na2CO3 --> CaCO3 + 2 NaC2H3O2
a)
Synthesis
b)
Double Replacement
c)
Combustion
d)
Decomposition
22.
What type of reaction is this?
C3H8 + 5 O2 --> 3 CO2 + 4 H2O
C3H8 + 5 O2 --> 3 CO2 + 4 H2O
a)
Synthesis
b)
Double Replacement
c)
Combustion
d)
Decomposition
23.
Which of the following does the arrow in a chemical equation NOT mean?
a)
yields
b)
produces
c)
exchanges with
d)
forms
24.
Black = Carbon (C)
White = Hydrogen (H)
What would be the formula for ethane?
White = Hydrogen (H)
What would be the formula for ethane?
a)
CH4
b)
CH6
c)
C2H2
d)
C2H6
25.
Na2CO3
How many total atoms are in sodium carbonate?
How many total atoms are in sodium carbonate?
a)
2
b)
3
c)
6
d)
10
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