Group 2 Flashcards
Describe the electron configurations of group 2 metal
All group 2 elements have two electrons in their outermost shell and a full S^2 orbital
What reactions are Group 2 elements often in
Redox reaction
What agent are Group 2 elements often
Reducing agent ( Group 2 metals are always oxidised)
What is formed when group 2 elements react with Oxygen
Metal Oxide formula: MO
What is formed when group 2 elements react with water
Salt and Hydrogen
What happens to Group 2 reactions with water as the group descends and why?
Reactions become more vigorous down the group as metals reactivity increases down the group.
What happens when group 2 elements react with dilute acids
Salt and water is produced
What is the trend in ionistation energy in group 2 and why?
As group 2 descends ionisation energy increases.This is because there is more electron sheilding and a larger atomic radius (outweighing the increases nuclear charge) reducing the nuclear attraction between the nucleus and outer shell electrons. Allowing group 2 elements to more easily lose their atoms down the group, become better reducing agents.
What happens when group 2 oxides react with water?
Hydroxide ions and metal cations are produced forming alkaline solutions of metal hydroxides.
However metal hydroxides arent very soluble in water and form metal hydroxide precipitate.
What happens to the solubility of group 2 hydroxides?
The solubility of group 2 hydroxides increases down the group.
how to test for the increasing (down the group) solubility of metal hydroxides
Add metal hydroxide in excess to a testube with water, and test the pH, higher the pH the more soluable the metal hydroxide as more OH- is present.
What are the two uses of group 2 compounds as bases?
Agriculture Ca(OH)2 to neutralise acidic soils
Medicine CaCO3 and Mg(OH)2 to treat acid indigestion
Why is Mg(OH)2 good at treating acid indigestion
Mg(OH)2 is relatively insoluable in water and so it will have little effect until it reaches the HCl in stomach acid, neutralising it.
