Group 2 Flashcards
What is the trend in melting points down group 2?
As you go down the group, the electrons in the ‘sea’ of delocalised electrons are further from the positive nuclei, as a result , metallic bonding strength decreases, therefore the melting point decreases.
What is the trend in ionisation energy down group 2?
As you progress down the group, ionisation energy decreases as less energy is required to remove an electron as there is less affect of nuclear charge, electrons are further away from the positive nucleus.
What is a use of magnesium hydroxide?
Mg(OH)2 is milk of magnesia and is used in indigestion remedies to neutralise excess stomach acid which causes heartburn, indigestion and wind.
What is the trend in solubility of the group 2 hydroxide?
Going down group 2 there is an increase in solubility. Mg(OH)2 is almost insoluble.
What is the trend in the solubility of group 2 sulfates?
The solubility decreases down the group ,BaSO4 is virtually insoluble.
What is a medical use of barium sulfate?
Taken by mouth as barium outlines the gut , used for visibility in X-rays.
Write an equation for the reaction between magnesium and water.
Mg(s) + H20(g) —> MgO(s) + H2(g)
Write an equation for the reaction between barium and sulfate.
Ba2+ (aq) + SO4 2- (aq) —> BaSO4 (s)
