Group 2 Flashcards
What is the rend in reactivity for group 2
Reactivity increases down the group
Why does reactivity increase
Increase in atomic radii
More shielding
Less electrostatic attraction between outer electrons and nucleus
What is the trend in ionisation energy
It decreases down the group
because electrons are more easily lost
Due to increasing atomic radii and shielding
Write an equation for
Ca + H2O
Ça + 2h2o -> Ca(OH)2 + H2
Write an equation for:
Ça + oxygen
2ca + o2 -> 2CaO
How do you know a group oxide has been produced
Solid white ppt
Write an equation for:
Ça + HCl
Ça + 2HCl -> CaCl2 + H2
What happen to the reactions with group 2 metals ans water/dilute acids as you go down the group
Get more vigorous
Why are group 2 oxides strong alkalis
The oxides react readily with water forming hydroxides
The Oh- dissolve In water
What is the trend in alkaline strength in group 2
Oxides are stronger down the group
Because the hydroxides get more soluble
Why is MgO a weak alkali
Reacts slowly with water
The hydroxide isn’t very soluble
What is the use of Ca(OH)2
Agriculture to neutralise acidic soil
What is the use of mg(oh)2 and caco3
Antacids
What is the reaction of mg(oh)2 and HCl
Mg(OH)2 + 2HCl -> 2H2O + mgcl2
What is an alkali
Base that’s soluble in water
