group 2 Flashcards
1st Ionisation energy of group 2 as we go down
decreases
reactivity increases
Why does reactivity increase as we go down group 2
Shielding gives weaker attraction between nucleus and outer electron
Also an increase in protons but shielding effect overrides this
What happens to group 2 elements when reacted with water
alkanline hydroxides and hydrogen
What happens to the reactivity with water as we go down group 2
Reactivity increases - no reaction with beryllium
Magnesiums reaction with water
Reacts slowly with cold water but more vigorously with steam. This produces magnesium oxide instead of magnesium hydroxide.
What do group 2 elements look like
white solids
group 2 elements reacted with oxygen
metal oxide
oxides of group 2 reacted with water
hydroxide
group 2 hydroxides solubility
only slighty soluable
When solution becomes saturated, any further metal or hydroxide will form a solid precipitate
what can group 2 compounds be used to do
neutralise acid
Acidic soils - calcium hydroxide
Stomach acid - magnesium hydroxide
solubility of hydroxides
increases down group
more OH ions, more alkaline
thermal decomposition of a group 2 carbonate
metal oxide and co2
thermal decomposition trend of group 2 as you go down group
ease of thermal decomposition decreases
what do you see when reacting a group 2 with water
- dissolving
- fizzing
