Unit C1

Question 1

Atomic Number

Answer 1

The number of protons in the nucleus of an atom

Question 2

Mass number

Answer 2

The number of protons and neutrons in the nucleus of an atom

Question 3

Isotopes

Answer 3

Atoms of an elements which have the same number of protons but different number of neutrons

Question 4

Cation

Answer 4

A positive ion

Question 5

Anion

Answer 5

Negative ion

Question 6

Element

Answer 6

A substance that has only one type of atom and cannot be broken down into simpler substances

Question 7

Atom

Answer 7

Simplest particle of an elements which that can exist on its own stable environment

Question 8

Molecule

Answer 8

A particle that has two or more atoms chemically bonded together

Question 9

Diatomic

Answer 9

Two atoms covalently bonded together

Question 10

Compound

Answer 10

Two or more elements chemically combined

Question 11

Ionic bonding

Answer 11

The attraction between oppositely charged ions

Question 12

Single covalent bond

Answer 12

Formed by a shared pair of electrons

Question 13

Metallic bonding

Answer 13

The results from an attraction between the positive ions in a regular lattice and the delocalised electrons

Question 14

Malleable

Answer 14

Can be hammered into shape

Question 15

Ductile

Answer 15

Can be drawn into wires

Question 16

Van der Waals

Answer 16

Intermolecular forces between covalent molecules

Question 17

Alloy

Answer 17

A mixture of 2 or more elements at least one is a metal

Question 18

Allotropes

Answer 18

Different forms of the same element in the same physical state

Question 19

Graphene

Answer 19

An allotrope of carbon whose structure is a single atom thick layer of graphite

Question 20

Nanometer

Answer 20

10 to the power of -9 meters

Question 21

Nano particle

Answer 21

A structure that is 1 to 100 nanometers in size and contains a few hundred atoms

Question 22

Period

Answer 22

Horizontal row in period table

Question 23

Group

Answer 23

Vertical column in periodic table

Question 24

Indicator

Answer 24

A chemical that gives colour change in acidic, alkaline and neutral solutions

Question 25

Percentage yield

Answer 25

Actual yield over theoretical yield times by 100

Question 26

Base

Answer 26

A substance that reacts with an acid producing a salt and water

Question 27

Alkali

Answer 27

A soluble base

Question 28

Strong acid and alkali

Answer 28

Completely ionises in water

Question 29

Weak acid and alkali

Answer 29

Partially ionises in water

Question 30

Neutralisation

Answer 30

The reaction between all the hydrogen ions in an acid the hydroxide ions in an alkali to produce water

Question 31

Salt

Answer 31

A compound formed when some or all of the hydrogen ions in an acid are replaced by metal ions or ammonium ions

Question 32

Pure substance

Answer 32

Single element or compound not mixed with any other substance

Question 33

Mixture

Answer 33

2 or more substances mixed together with any other substance and usually easy to separate

Question 34

Meting point

Answer 34

The temperature at which a solid changes into a liquid

Question 35

Boiling point

Answer 35

The temperature at which a liquid changes into a gas

Question 36

Formulation

Answer 36

A mixture which has been designed as a useful product and is formed by mixing together several different substances in carefully measured quantities to ensure the product has the required properties

Question 37

Soluble

Answer 37

Substance which dissolves in water

Question 38

Insoluble

Answer 38

Substance which doesn’t dissolve in water

Question 39

Solute

Answer 39

Dissolves in water

Question 40

Solvent

Answer 40

The liquid in which a solute dissolves in

Question 41

Solution

Answer 41

Formed when a solute dissolves in a solvent

Question 42

Residue

Answer 42

The solid which remains on the filter paper

Question 43

Filtrate

Answer 43

The solution which passes through the filter paper

Question 44

Distillate

Answer 44

The liquid which is collected by condensation of a vapour during distillation process

Question 45

Miscible

Answer 45

Liquids mix

Question 46

Immiscible

Answer 46

Liquids don’t mix

Question 47

Evaporation

Answer 47

When a liquid changed to a gas below the boiling point

Question 48

Condensation

Answer 48

Occurs when a gas changes into a liquid

Question 49

Anhydrous copper(II) sulfate

Answer 49

A white solid which does not contain any water of crystallisation