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WorksheetsChemical Reactions and Redox Review
Total questions: 20
Worksheet time: 33mins
Name
Class
Date
1.
The diagram shows an electric heater. Which method would be used to plate the chromium on to the steel?
a)
alloying
b)
electrolysis
c)
galvanizing
d)
oxidation
2.
Zinc reacts with steam to form zinc oxide and hydrogen.
Zn + H2O ------> ZnO + H2 During the reaction, which substance is oxidised?
Zn + H2O ------> ZnO + H2 During the reaction, which substance is oxidised?
a)
hydrogen
b)
water
c)
zinc
d)
zinc oxide
3.
Haematite is reduced to iron in the blast furnace.
haematite + carbon monoxide ---> iron +X What is X?
haematite + carbon monoxide ---> iron +X What is X?
a)
carbon
b)
carbon dioxide
c)
hydrogen
d)
oxygen
4.
Electrolysis is an expensive way of extraction. Which metal has to be extracted from its ore by electrolysis?
a)
aluminium
b)
copper
c)
lead
d)
iron
5.
The incomplete equation shows a reaction. CuCO3 + H2SO4 ------> products What are the products of this reaction?
a)
copper(II) oxide, sulphur dioxide, hydrogen
b)
copper(II) oxide, sulphur dioxide, water
c)
copper(II) sulphate, carbon dioxide, hydrogen
d)
copper(II) sulphate, carbon dioxide, water
6.
What is formed when calcium carbonate is heated?
a)
calcium and carbon
b)
calcium and carbon dioxide
c)
calcium oxide and carbon
d)
calcium oxide and carbon dioxide
7.
The diagram shows a method used to electroplate a key with copper. Which aqueous solution is most suitable for the electrolyte?
a)
copper(II) sulphate
b)
ethanol
c)
sodium hydroxide
d)
sulphuric acid
8.
Which product is manufactured by electrolysis?
a)
aluminium
b)
copper(II) sulphate
c)
sodium chloride
d)
steel
9.
Which equation shows an oxidation reaction?
a)
A
b)
B
c)
C
d)
D
10.
This is the half reaction for:
Sn(s) → Sn4+(aq) + 4e−
Sn(s) → Sn4+(aq) + 4e−
a)
redox
b)
reduction
c)
oxidation
d)
neutralization
11.
Complete the following word equation:
manganese(II) oxide + hydrochloric acid → ............................... + ...............................
manganese(II) oxide + hydrochloric acid → ............................... + ...............................
a)
magnesium chloride and water
b)
manganese (II) chloride and water
c)
manganese (II) oxide and water
d)
manganese (II) oxide and hydrochloric acid
12.
Copper is refined by the electrolysis of aqueous copper(II) sulphate using copper electrodes. Describe the change that occurs at the electrodes. (i) cathode (pure copper) ...............................................................................................
(ii)anode (impure copper) ..............................................................................................
(ii)anode (impure copper) ..............................................................................................
a)
(i) reduction (ii) oxidation
b)
(i) oxidation (ii) reduction
13.
Which change is reduction?
a)
change 1
b)
change 2
c)
neither
14.
What is the oxidation number of carbon in NaHCO3?
a)
+1
b)
+4
c)
-4
d)
+6
15.
What type of reaction is the following?
Zn(s) + 2Cu(NO3)2(aq) ---> 2Cu(s) + Zn(NO3)2(aq)
Zn(s) + 2Cu(NO3)2(aq) ---> 2Cu(s) + Zn(NO3)2(aq)
a)
double displacement
b)
single displacement
c)
precipitation
d)
neutralization
16.
Which one of the following salts is insoluble?
a)
NH4Cl
b)
Ca(NO3)2
c)
BaCO3
d)
Zn(CH3COO)2
17.
Sodium reacts with sulphur to form sodium sulphide.
2Na + S →Na2S This is an example of:
2Na + S →Na2S This is an example of:
a)
decomposition
b)
synthesis
c)
single replacement
d)
precipitation
18.
Which expression represents the oxidation of the copper(I) ion?
a)
Cu+----> Cu2+ + e–
b)
Cu ----> Cu+ + e–
c)
Cu+ + e– ----> Cu0
d)
Cu+ + e– ----> Cu2+
19.
What does the term aqueous (aq) mean?
a)
An ionic compound is dissolved in water
b)
An ionic compound forms a solid in water
c)
Water is produced in the reaction
d)
Water is a reactant in the reaction
20.
What is the precipitate that is formed when solutions of Pb(NO3)2 and KI are combined?
a)
NO3I
b)
KNO3
c)
K2Pb
d)
PbI2
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