Physical Topics 1 & 7

Question 1

Atomic number

Answer 1

Number of protons in an atom

Question 2

Mass number

Answer 2

Number of protons and neutrons in an atom

Question 3

Relative atomic mass

Answer 3

The average mass of one atom of an element compared to one twelfth of the mass of one atom of carbon-12

Question 4

Isotopes

Answer 4

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

Question 5

Mass spectrometer

Answer 5

Ionisation
Acceleration
Drift area
Ion detector

Question 6

Ionisation energy

Answer 6

The energy required to remove a mole of electrons from a mole of atoms in the gaseous state and at a constant pressure

Question 7

Enthalpy change

Answer 7

Heat energy change at a constant pressure

Question 8

Oxidation

Answer 8

Loss of electrons

Increase in oxidation number

Question 9

Reduction

Answer 9

Gain of electrons

Decrease in oxidation number

Question 10

How to balance half-equations

Answer 10

1. Balance oxygens with waters
2. Balance hydrogens with H+ ions
3. Use electrons to balance charge

Question 11

Disproportionation

Answer 11

When atoms of the same element are simultaneously oxidised and reduced