Key Words

Question 1

Molecule

Answer 1

A substance in which two or more atoms are chemically joined together

Question 2

Element

Answer 2

A pure substance that is made of only one type of atom

Question 3

Compound

Answer 3

A pure substance that contains two or more different elements chemically joined together

Question 4

Mixture

Answer 4

An impure substance that contains two or more substances found together but not chemically joined

Question 5

Atomic number

Answer 5

The number of protons there are in a Nucleus

Question 6

Mass number

Answer 6

The number of protons and neutrons in a nucleus

Question 7

Isotopes

Answer 7

Atoms which have the same atomic number but different mass number

Question 8

Relative atomic mass

Answer 8

The weighted average mass of atoms of element on an scale where an atom of carbon - 12 has a mass of 12

Question 9

A mole

Answer 9

A measurement that represents the amount of a substance

Question 10

Empirical formula

Answer 10

Simplest whole number ratio of atoms of each element present in a compound

Question 11

Ion

Answer 11

An atom or group of atoms that has lost or gained electrons to acquire an electric charge

Question 12

Reduction

Answer 12

Is the gain of electrons and the loss of oxygen

Question 13

Oxidation

Answer 13

The loss of electrons and the gain of oxygen

Question 14

Ionic Bonding

Answer 14

A strong electrostatic attraction between opposite you charged ions within a 3 D lattice

Question 15

An ionic crystal

Answer 15

A giant three dimensional lattice structure held together by oppositely charged ions

Question 16

A covalent bond

Answer 16

A Bond formed between atoms by sharing a pair of electrons to complete their outer shell

Question 17

A covalent bond

Answer 17

Bond is held together by a shared attraction between positively charge nuclei and the negatively charged bonding pair of electrons

Question 18

Metal

Answer 18

A giant structure of positive ions surrounded by a sea of delocalised electrons

Question 19

Electrolyte

Answer 19

A substance that undergoes electricity

Question 20

Electrolysis

Answer 20

The decomposition of a substance via electricity

Question 21

Redox reaction

Answer 21

A reaction in which both reduction and oxidation are taking place

Question 22

Oxidising agent

Answer 22

A substance that is capable of oxidising another substance

Question 23

Homologous series

Answer 23

A family of organic compounds that share the same general formula and the same functional group and have similar chemic reactions

Question 24

Hydrocarbon

Answer 24

Compound of hydrogen and carbon only

Question 25

Saturated

Answer 25

Compound that contains only single carbon to carbon bonds

Question 26

Unsaturated

Answer 26

Compound that contains atoms at least one carbon to carbon double bond

Question 27

General formula

Answer 27

Shared by members of an homologous series. Shows the ratio of carbon to hydrogen present in each compound as an allegorical expression

Question 28

Isomerism

Answer 28

Where compounds share the same material formula but different structural formula

Question 29

Exothermic

Answer 29

A reaction that release heat energy to the surroundings combustion

Question 30

Endothermic

Answer 30

A reaction which absorbs heat from the surroundings photosynthesis

Question 31

Atom

Answer 31

The smallest unit of an element