C5 Electricity and Chemistry

Question 1

What is electrolysis?

Answer 1

The breakdown of an ionic compound when molten or in aqueous solution by the passage of electricity.

Question 2

Electrodes

Answer 2

A metal strip that conducts electricity.

Question 3

Electric Conductor

Answer 3

A material which allows an electrical current to pass through it easily.

Question 4

Inert Electrode

Answer 4

Electrodes need to be inert so that they do not react with the electrolyte.

Question 5

Electrolyte

Answer 5

A substance which, when molten or in solution, will conduct an electric current.

Question 6

Anode

Answer 6

The positive electrode during electrolysis.

Question 7

Cathode

Answer 7

The negative electrode during electrolysis.

Question 8

Cation

Answer 8

Positive Ion that goes to the cathode.

Question 9

Anion

Answer 9

Negative Ion that goes to the anode.

Question 10

Litmus paper

Answer 10

A type of indicator that can be red or blue. Red litmus turns blue in alkalis, while blue litmus turns red in acids.

Question 11

Ore

Answer 11

A rock containing enough quantities of a mineral for extraction to be possible.

Question 12

Reactivity series

Answer 12

A list of elements in order of their reactivity, usually from most reactive to least reactive.

Question 13

Corrosion

Answer 13

The destruction of a metal by oxidation or chemical action, for example, rusting.

Question 14

Aqueous solution (aq)

Answer 14

A solution in which the solvent is water.

Question 15

Oxidation

Answer 15

Loss of electrons, occurs at positive anode

Question 16

Reduction

Answer 16

Gain of electrons, occurs at negative cathode

Question 17

Inert electrode

Answer 17

Electrodes are usually made of carbon, which is inert, and do no not undergo any chemical change during the electrolysis.

Question 18

Electrolytic cell

Answer 18

A beaker with an electrolyte, 2 electrodes, a power supply and leads which changes electrical energy into chemical energy

Question 19

Oxidizing agent

Answer 19

A chemical which oxidises another chemical; it loses oxygen/gains electrons and becomes reduced

Question 20

Sacrificial protection

Answer 20

protecting metal from corrosion by attaching it to a less reactive metal

Question 21

Galvanization

Answer 21

The process of protecting metals by coating them with a thin layer of zinc

Question 22

Test for hydrogen gas

Answer 22

Makes a squeaky pop with a lighted splint