Chemical Effects of Electric Currents

A conductor is any material which _____________ electricity to pass through it

• Allows

• Does not allow

Which of the following solid materials are CONDUCTORS of electricity?

• Glass

• Iron

• Rubber

• Wood

• Aluminium

Which of the following solids are INSULATORS of electricity

• Nickel

• Wood

• Rubber

• Zinc

• Glass

Which of the following liquids are good conductors?

• Lemon Juice

• Petrol

• Tap Water

• Distilled Water

Which of the following liquids are bad conductors?

• Copper Sulphate Solution

• Tap Water

• Kerosene

• Distilled Water

A tester is used to check the conduction of electricity through two liquids, labelled A and B.

It is found that the bulb of the tester glows brightly for

liquid A while it glows very dimly for liquid B.

• Liquid A is a better conductor than Liquid B

• Liquid B is a better conductor than Liquid A

• Both liquids are equally conducting

• We cannot compare the conductivity this way

True or False: The electrode which is connected to the negative terminal of a battery is called the anode.

• True

• False

Which of the following is NOT a chemical reaction caused by electric current passing through liquids

• The colour of the electrolyte changes

• Metal coating can be formed on the electrodes

• Bubbles can form near the electrodes

• Different smells can be released

The process of depositing a layer of any desired metal on another

material by means of electricity is called

(a)  

Give 2 examples of why we use electroplating