A-Level Chemistry

Front 1

Amount of Substance

Back 1

The quantity whose unit is the mole. Chemists use 'Amount of Substance' as a means of counting atoms.

Front 2

Number of moles?

Back 2

Sample/Molar mass (Atomic number)

Front 3

Avogadro constant

Back 3

Na(small a) is the number of atoms per mole of the carbon-12 isotope. 6.02x10(23) mol(-1)

Front 4

Mole

Back 4

The amount of any substance containing as many particles there are carbon atoms in exactly 12g of the carbon-12 isotope.

Front 5

A Molecule

Back 5

Two or more atoms joined together

Front 6

Ion

Back 6

A charged particle

Front 7

Which atomic structure, when varied, changes the element?

Back 7

Proton

Front 8

Which atomic structure, when varied, changes the ionisation of the particle?

Back 8

Electron

Front 9

Which atomic structure, when varied, causes an isotope?

Back 9

Neutron

Front 10

RELATIVE ATOMIC MASS

Back 10

THE AVERAGE MASS OF AN ELEMENT, COMPARED WITH 1/12 THE MASS OF CARBON-12.

Front 11

Isotope

Back 11

The same atomic number but different mass numbers OR The same no. of protons but different number of neutrons.

Front 12

What are the two properties of an isotope?

Back 12

Chemical; How the electrons are arranged on the outer shell
Physical(such as density); different masses (melting/boiling points) (FATTIES STICK TOGETHER)

Front 13

Calc RAM:
Cl; Cl-35 75% and Cl-37 25%

Back 13

Average mass:
(75x35)+(25x37) / 100 =35.5

Front 14

What are the two main evidences for the existence of atomic shells?

Back 14

LINE SPECTRUM
SUCESSIVE IONISATION

Front 15

Tell me about S,P,D,F orbitals.

Back 15

S has max of 2. (1 orbital)
P has a max of 6. (3 orbitals)
D has a max of 10. (5 orbitals)
F has a max of 14. (7 orbitals)
E.G O (8 e-).
1s(2),2s(2), 2p(4)

Front 16

1st Ionisation Energy

Back 16

Removal of one mole of electrons from the outer shell of one mole of atoms in the gaseous state.