Year 9 exam key words

Question 1

Compound

Answer 1

2 or more substances chemically bonded

Question 2

Mixture

Answer 2

made by mixing other substances together

Question 3

valency

Answer 3

the combining power of an atom

Question 4

ion

Answer 4

a charged particle

Question 5

chemical reaction

Answer 5

produces a new substance

Question 6

thermal decomposition

Answer 6

the breaking down of one substance into many others using heat

Question 7

electrolysis

Answer 7

when a compound is split using electricity

Question 8

electroplating

Answer 8

coat a metal object with silver, copper or another metal

Question 9

oxidation

Answer 9

the gain of oxygen

Question 10

reduction

Answer 10

the loss of oxygen

Question 11

ore

Answer 11

naturally occurring source of metal that you can extract a metal from

Question 12

fuel

Answer 12

material such as coal, gas or oil that is burned to produce power or heat

Question 13

neutralisation

Answer 13

when a acid reacts with a base

Question 14

exothermic

Answer 14

is the release of energy

Question 15

endothermic

Answer 15

a reaction in which the system absorbs energy from its surrounding

Question 16

element

Answer 16

made from one sort of atom

Question 17

group

Answer 17

horizontal row in the periodic table

Question 18

period

Answer 18

vertical row in the periodic table

Question 19

atomic number

Answer 19

the number of protons in the nucleus of an atom

Question 20

mass number

Answer 20

the number of protons and neutrons in a atom