Electrochemistry

Class 9 · Chemistry · 6 questions

Name: ____________________ Date: ____________

The process of splitting a compound by passing electric current through it is called:
- A Filtration
- B Combustion
- C Electrolysis
- D Distillation
In electrolysis, the electrode connected to the negative terminal of the battery is the:
- A Salt bridge
- B Anode
- C Cathode
- D Electrolyte
Oxidation is the:
- A Loss of neutrons
- B Gain of electrons
- C Loss of electrons
- D Gain of protons
What is collected at the cathode when molten sodium chloride is electrolysed?
- A Hydrogen
- B Sodium
- C Chlorine
- D Oxygen
Electroplating is used to:
- A Cool a metal
- B Make water pure
- C Make alloys
- D Coat one metal with a thin layer of another
The oxidation number of oxygen in most compounds is:
- A -2
- B +1
- C +2
- D 0

Answer key

1. C, 2. C, 3. C, 4. B, 5. D, 6. A

This is electrolysis.
The cathode is the negative electrode and attracts positive ions.
Oxidation means loss of electrons (OIL RIG).
Sodium ions gain electrons at the cathode to form sodium metal.
In electroplating a metal is coated by electrolysis, for example chromium or silver plating.
Oxygen is usually -2 in compounds.