WorksheetsChemical Reactions
Total questions: 13
Worksheet time: 35mins
Name
Class
Date
1.
The number of atoms you begin with in a chemical reaction ...
a)
must be the same as the number of atoms you end with
b)
must be an even number
c)
can be different to the number you finish with
d)
changes depending on how much energy is formed
2.
Which type of reaction is:
2 NH3 + H2SO4 → (NH4)2SO4
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
3.
Which type of reaction is: C2H4 + 3 O2 → 2 CO2 + 2 H2O
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Combustion
4.
Which type of reaction is:
2 K + MgBr2 → 2 KBr + Mg
a)
Synthesis
b)
Decomposition
c)
Single Displacement
d)
Double Displacement
5.
Provides evidence that a chemical reaction has occurred.
a)
dissolving
b)
melting
c)
formation of a gas
d)
bending
6.
Which problem is balanced?
a)
PbO2 + 2H2--> H2SO4
b)
SO2 + H20 --> H2SO4
c)
2Na + 2H2O --> 2NaOH + H2
d)
2Na + 2H2O --> 2NaOH + H
7.
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
8.
In a reaction A + B ----> C, reactant A has 5g and product C has 9g. How many grams does reactant B should have?
a)
4g
b)
5g
c)
9g
d)
14g
9.
In the reaction AB-----> A + B reactant AB has 12g and product B has 5g. How many grams should product A have?
a)
17g
b)
2g
c)
7g
d)
None of the above
10.
In a chemical reaction, 4 grams of sodium must combine with how many grams of chlorine to produce 10 grams of table salt?
a)
4 grams
b)
6 grams
c)
8 grams
d)
10 grams
11.
What is the part of the chemical equation in green called?
Fe + S → FeS
a)
products
b)
reactants
c)
yield
d)
input
12.
What two molecules are produced in a combustion reaction?
a)
CO2 + NH4
b)
SiO2 + H2O
c)
H2O + CO2
d)
CO2 + H2O2
13.
When coal burns carbon dioxide is produced from the carbon in coal and the oxygen in air. Which of these is the best evidence that a chemical reaction occurs when coal burns?
a)
The shape of the coal changes
b)
Oxygen is present
c)
A new substance is produced
d)
Coal is made up of more than one element
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