Exam

Question 1

Define Relative Atomic Mass

Answer 1

This is the weighted mean mass
of an atom of an element,
compared to 1/12th of the
mass of an atom of carbon-12.

Question 2

Define Relative Isotopic Mass

Answer 2

This is the mass of an atom of an isotope,
compared with 1/12th of the
mass of an atom of carbon-12.

Question 3

The relative molecular mass refers to ___a____ while relative formula mass refers to ____b_____

Answer 3

a = simple molecules
b = giant covalent compounds and ionic compounds

Question 4

State Le Chatelier’s Principle

Answer 4

If there’s a change in concentration, pressure or temperature, the equilibrium will move to help counteract the change.

Question 5

Define first ionisation energy

Answer 5

This is the energy required to remove one electron from one mole of an atom of an element in its gaseous state
O(g) —-> O+(g) + e-

Question 6

Define first electron affinity

Answer 6

This is the energy required to add one electron to an atom of an element in it’s gaseous state
O(g) + e- —–> O-(g)

Question 7

The process of first ionization energy is

Answer 7

Endothermic

Question 8

Defne an orbital

Answer 8

This is the region within an atom that can hold up to two electrons

Question 9

Define Ionic Bonding

Answer 9

This is the strong electrostatic attraction between oppositely charged ions

Question 10

Define Covalent Bonds

Answer 10

This is the strong electrostatic attraction between two nuclei and the shared pair of electrons between them