Definitions

Question 1

Group

Answer 1

Is a column of elements in the periodic table

Question 2

Period

Answer 2

Is the name of the horizontal rows in the periodic table

Question 3

Atomic number

Answer 3

Is the number of protons in an atom of an element

Question 4

Mass number

Answer 4

The total number of protons and neutrons in an atom

Question 5

Compound

Answer 5

Is a substance formed when two or more chemical elements are chemically bonded together

Question 6

Mixture

Answer 6

Contains two or more substances that are not chemically combined

Question 7

Element

Answer 7

An element is a substance consisting of atoms which all have the same number of protons

Question 8

Valency

Answer 8

A combing power of an atom

Question 9

Ion

Answer 9

A charged particle

Question 10

Chemical reaction

Answer 10

New substances are made during a chemical reaction

Question 11

Thermal decomposition

Answer 11

Substances that are decomposed by heat

Question 12

Electrolysis

Answer 12

When a compound is split up into its elements using electricity

Question 13

Oxidisation

Answer 13

The gain of oxygen

Question 14

Reduction

Answer 14

The loss of oxygen

Question 15

Ore

Answer 15

Naturally occurring rocks that contain metal

Question 16

Fuel

Answer 16

Is a substance that burns to release energy

Question 17

Neutralization

Answer 17

When an acid reacts with a base

Question 18

Exothermic

Answer 18

Energy given out

Question 19

Endothermic

Answer 19

Reactions that take in energy from surroundings