WorksheetsGrade 12th Chemistry
Total questions: 15
Worksheet time: 55mins
a process of generating electricity from chemicals
Coverts chemical energy to electrical energy
Choose the half-equation that shows the change of an aluminum ion at the cathode.
Al2+ + 3e- --> Al
Al3+ + 3e- --> Al
Al3+ --> Al + 3e-
Al2O3------Al + O2
What is the equation to show what happens to Cl- ions at the anode?
Cl- --> Cl + e-
2Cl- --> Cl2 + 2e-
Cl2 + 2e- --> 2Cl-
NaCl---Na + Cl2
What is the rule for predicting the product of electrolysis of a solution at the anode?
If a halide ion is present,
the halogen will be produced
Oxygen is always produced
Sodium hydroxide is produced
Which is the rule for deciding the product at the cathode?
The more reactive metal/hydrogen ion remains in the solution.
The less reactive metal/hydrogen ion remains in the solution.
When molten lead bromide is electrolyzed, the products are
lead at the cathode and
bromine at the anode
hydrogen at the cathode and
bromine at the anode
bromine at the cathode and
hydrogen at the anode
The diagram shows an electrolysis circuit.
At which electrode is hydrogen formed?
A
B
C
D
Which products are formed at the anode and cathode when electricity is passed through molten
lead(II) bromide?
A
B
C
D
The diagram shows a failed attempt to copper-plate a pan.
Which action will plate the pan with copper?
cooling the copper sulfate solution in an ice bath
heating the copper sulfate solution to boiling point
increasing the voltage from 3V to 6V
making the pan the cathode and the copper the anode
What does electrochemistry deal with?
chemical reactions
chemical formulas
electricity
Le Chat's Principle
which element, if any, is oxidized?
