C1 definitions

Question 1

what are alkali metals

Answer 1

the elements in group 1 of the periodic table

Question 2

whats an atomic nucleus

Answer 2

positively charged object composed of protons and neutrons at the centre of every atom with one or more electrons orbiting it

Question 3

atomic number

Answer 3

the number of protons in nucleus

Question 4

whats an electron

Answer 4

a negatively charged sub atomic particle which orbit the nucleus at various energy levels.

Question 5

what is filtration

Answer 5

separating technique used to sperate solids from liquids

Question 6

what is an ion

Answer 6

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

Question 7

mass number

Answer 7

the total number of protons and neutrons in the nucleus

Question 8

relative atomic mass

Answer 8

a value that take account of the abundance of the isotopes of the element

Question 9

chromatography

Answer 9

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

Question 10

compound

Answer 10

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

Question 11

crystallisation

Answer 11

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

Question 12

Displacement

Answer 12

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

Question 13

electron

Answer 13

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

Question 14

Electron shell

Answer 14

Different energy levels in atoms occupied by electrons.

Question 15

fractional distillation

Answer 15

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

Question 16

isotope

Answer 16

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

Question 17

Mass number

Answer 17

The total number of protons and neutrons in the nucleus.

Question 18

Mixture

Answer 18

A mixture consists of two or more elements or compounds not chemically combined together

Question 19

Neutron

Answer 19

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

Question 20

Noble gases

Answer 20

The elements in Group 0 of the periodic table.

Question 21

Non-metals

Answer 21

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

Question 22

Nuclear model

Answer 22

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

Question 23

periodic table

Answer 23

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

Question 24

plum-pudding model

Answer 24

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 25

proton

Answer 25

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

Question 26

simple distillation

Answer 26

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

Question 27

transition metals

Answer 27

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

Question 28

solvent

Answer 28

substance,usually a liquid,in which other materials dissolve to form a solution

Question 29

solution

Answer 29

a similar mixture of one or more solutes dissolved in a solvent