Chemistry

Question 1

All matter

Answer 1

has atoms which are composed of protons, neutrons and electrons, mostly empty space

Question 2

Nucleus

Answer 2

Positively charged, protons and neutrons

Question 3

Electron cloud

Answer 3

Negatively charged, electrons

Question 4

Gold foil experiment

Answer 4

Thin strip of gold foil was shot at by positively charged alpha particles most past through but some reflected showing that there is a small area of positive charge in centre of atom

Question 5

Energy levels

Answer 5

2,8,8,18 (2)

Question 6

Atomic number

Answer 6

The number of protons and electrons in an element

Question 7

Atomic mass

Answer 7

The number of neutrons plus the number of electrons

Question 8

Metals

Answer 8

Left and centre of table often solid at room temperature and are conductive

Question 9

Non Metals

Answer 9

Right of table often gas at room temperature less conductive

Question 10

Group 8

Answer 10

Noble gases, non reactive

Question 11

Group 1

Answer 11

Reactive with water to form hydrogen and alkali solution

Question 12

Group 7

Answer 12

Highly reactive and the formation of salt with metals

Question 13

Ionic compounds

Answer 13

One element gives away its electron and becomes an ion as it bonds with an oppositely created ion, between metal and non metal

Question 14

Covalent compounds

Answer 14

Between two non metals share electrons

Question 15

Glucose

Answer 15

C6H12O6

Question 16

Ethanol

Answer 16

C2H5OH

Question 17

Democritus

Answer 17

In 400 BC Democritus speculated that all substances consisted of tiny indestructible particles called atoms

Question 18

Dalton

Answer 18

In 1808 John Dalton’s theory proposed that all matter consists of tiny indivisible particles called atoms, atoms of the same element were alike and atoms combined into simple whole number ratios

Question 19

Thomson

Answer 19

In 1897 Sir Thomson concluded that atoms consisted of negatively charged electrons which were embedded within a positively charged atom

Question 20

Rutherford

Answer 20

In 1911 Lord Rutherford suggested that atoms consisted of mainly empty space and had a dense nucleus containing positively charge protons in the centre. He also discovered that the electrons orbited around the nucleus

Question 21

Bohr

Answer 21

In 1913 Bohr put forward the idea that electrons orbited the nucleus at different energy levels but could change levels by gaining or losing energy

Question 22

Chadwick

Answer 22

In 1932 Sir James Chadwick discovered that the nucleus also contained neutrons which did not have an electrical charge

Question 23

Newlands

Answer 23

Ordered elements by atomic weight and noticed every 8 had similar properties

Question 24

Mendeleevs

Answer 24

Invented the periodic table