group 2

Question 1

atomic radius?

Answer 1

atomic radius increases down the group as the atoms have more shells of electrons making the atom bigger

Question 2

melting and boiling points?

Answer 2

melting and boiling points as the bonds weaken as the atomic size increases
the distance between the cations and delocalised electrons increases and therefore the electrostatic forces between the positive ions and delocalised electrons weaken

Question 3

ionisation energy

Answer 3

the first and second ionisation energy decrease down the groups
the outer electron are held more weakly because they are further from the nucleus and therefore become more shielded

Question 4

reactivity

Answer 4

reactivity increases down the groups as the atomic radius increase they become more shielding and the nucleus attraction decreases and it is easier to remove over electrons

Question 5

reactions with oxygen

Answer 5

group 2 will react with oxygen. to form a metal oxide (MO)
2Mg + O2 = 2MgO

Question 6

group 2 oxides with water

Answer 6

the oxides of group 2 will react with water to release hydroxide ions and form alkaline solutions
e.g CaO + H2O = Ca 2+ + 20H-

Question 7

reactions with water

Answer 7

group 2 reacts with h20 to form a alkaline hydroxide with hydrogen (M(OH2)

Question 9

reactions with dilute acids

Answer 9

MASH

Question 10

use of group 2 compounds as a base

Answer 10

calcium hydroxide - increases the ph of acidic soils and neutralises acids in the soil
magnesium hydroxide - used in medicine to neutralise excess acid and to treat indigestion