Definitions

Question 1

Acid

Answer 1

A solution with a pH of less than 7.

Question 2

Acid rain

Answer 2

Produced when gases such as sulphur dioxide is dissolve rainwater.

Question 3

Activation energy

Answer 3

The energy which must be supplied to reactants before they will react.

Question 4

Alkali

Answer 4

A solution with a pH greater than 7.

Question 5

Alkali metal

Answer 5

Elements in Group I of the periodic table.

Question 6

Alkane

Answer 6

Hydrocarbon with all single carbon - carbon bonds and the general formula CnH2n+2

Question 7

Alkene

Answer 7

Hydrocarbon containing one carbon-carbon double bond with the general formula CnH2n

Question 8

Alloy

Answer 8

A compound made from two or more metals

Question 9

Anode

Answer 9

The positive electrode

Question 10

Atom

Answer 10

The tiny particles which make up an element

Question 11

Atomic number

Answer 11

The number of protons in the nucleus of an atom. All atoms of the same element have the same atomic number

Question 12

Base

Answer 12

Substance that neutralises an acid

Question 13

Bauxite

Answer 13

An ore of aluminium, more common than cryolite but cannot be used in the electrolysis cell due to its high melting point.

Question 14

Blast furnace

Answer 14

The process used for making iron from iron ore, using limestone and coke

Question 15

Brine

Answer 15

Sodium chloride solution

Question 16

Catalysis

Answer 16

A substance that increases the rate of reaction without altering anything else. It is not used up during the reaction, and can be used over and over again.

Question 17

Cathode

Answer 17

The negative electrode.

Question 18

Chemical reaction

Answer 18

When two or more substances combine to make one or more new substances.

Question 19

Combustion

Answer 19

The process of burning.

Question 20

Compound

Answer 20

Two or more chemical elements joined together.