Definitions

Question 1

Alkali metals

Answer 1

Elements in group 1 in the periodic table

Question 2

Atom

Answer 2

Smallest part of the element that can exist. All substances are made up of atoms

Question 3

Atomic nucleus

Answer 3

Positively charged object composed of protons and neturons at the centre of every atom with one or more electrons orbiting it.

Question 4

Atomic number

Answer 4

The number of protons in the nucleus

Question 5

Chromatography

Answer 5

A separation technique used to separate a mixture of chemicals by distrubuting the components between two phases.

Question 6

Compound

Answer 6

A substance made up of two or more types of atoms chemically combined together.

Question 7

Crystallisation

Answer 7

A separation technique used to produce solid crystals from a solution by evaporating the solvent.

Question 8

Displacement

Answer 8

A chemical reaction in which a more reactive element displaces a less reactive element from its compound.

Question 9

Electron

Answer 9

Negatively charged subatomic particlw which orbit the nucleus at various energy levels. Very small relative mass.

Question 10

Electron shell

Answer 10

Different energy levels in atoms atoms occupied by electrons

Question 11

Elements

Answer 11

A substance made up of only of type of atom

Question 12

Filtration

Answer 12

A separate technique used to separate solids from liquids

Question 13

Fractional Distillation

Answer 13

A method of separting a mixture of substances according to their different boiling points.

Question 14

Group (periodic table)

Answer 14

the columns of the periodic table represent different groups of elements. Elements with similar properties are in the same group

Question 15

Halogens

Answer 15

Elements in Group 7 in the periodic table

Question 16

Ion

Answer 16

an atom or molecule with an electric charge due to the loss or gain of electrons

Question 17

Isotope

Answer 17

Atoms of the same element with the same number of protons but a different number of neutrons.

Question 18

Mass number

Answer 18

total number of protons and neturons in the nucleus

Question 19

metals

Answer 19

elements that react to form positive ions. Found to the left and towards the bottom of the periodic table

Question 20

Mixture

Answer 20

consists of two or more elements or compounds not chemically combined together.

Question 21

Neutron

Answer 21

Neutral subatomic particle present in the nucleus of the atom. Relative massof 1.

Question 22

Noble gases

Answer 22

Elements in Group 0 in the periodic table

Question 23

Non-metals

Answer 23

elements that react to form negative ions. Found towards the right and the top of the periodic table.

Question 24

nuclear model

Answer 24

the nuclear atomic model stated that the mass was concentrated at the centre of the atom and that the nucleus was charged.

Question 25

periodic table

Answer 25

Table of the elements arrnaged in order of atomic number and such that elements with similar properties are in the same column (group).

Question 26

Plum pudding model

Answer 26

Atomic model devised after the discovery of the electron. The model suggests the atom is a ball of positive charge with negative electrons scattered through it.

Question 27

Proton

Answer 27

Positively charged subatomic particle present in the nucleus of the atom. Relative mass of 1.

Question 28

Relative atomic mass

Answer 28

an average value that takes account of the abundance of the isotopes of the element.

Question 29

Simple distillation

Answer 29

a procedure by which two liquids with different boiling points can be separated.

Question 30

Transition metals

Answer 30

the collection of metallic elements in the middle of the periodic table.