AS,ES Formulas

Question 1

Molecular Formula

Answer 1

Actual Number of atoms of each element in a molecule
e.g C6H12O6

Question 2

Empirical Formula

Answer 2

Mass or % divided by Mr
Divide all answer by smallest
Find the simplest whole number ratio

Question 3

Water of Crystallisation

Answer 3

1) Mass of anhydrous salt:
Mass of crucible & residue - mass of crucible
2) Mass of water lost:
Mass of crucible & hydrated salt - mass of crucible & residue
3) Ratio of Anhydrous salt : water
(empirical formula)

Question 4

Relative Atomic Mass (Ar) using mass spectrometry

Answer 4

1) Multiply each isotopic mass by its relative abundance
2) Add them all together
3) Divide by 100

Question 5

Electron Structure

Answer 5

1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2

Question 6

Atomic Orbital

Answer 6

A regional within an atom that can hold up to 2 electrons with opposite spins