2.2 Group 2 Metals Flashcards
What is the trend in atomic radius as you move down group 2 metals?
Increase as you move down as there is an increased number of full energy levels
What is the trend in first ionisation energy as you move down the group 2 metals?
Decrease as you move down as
- shielding increases
- radius increases so distance between electrons and nucleus us larger
What is the trend in melting points of the group 2 metals?
Decrease as the radius of ions increase, meaning charge density decreases, forces of attraction between metal ions and delocalised electrons decrease
What is the reaction between beryllium and water like?
There is no reaction with water or steam, even when heated
What is the reaction between magnesium and water like?
Very slow reaction
What is the reaction between calcium and water like?
Steady reaction with water, forming a cloudy alkaline solution
What is the reaction between strontium and water like?
Quick, exothermic reaction with water, forming a cloudy alkaline solution
What is the reaction between barium and water like?
Quick exothermic reaction with water, forming an alkaline solution
What is the term in solubility as you move down the group 2 hydroxides?
Increase in solubility
What is magnesium hydroxide used for ?
Used as an antacid, forms milk of magnesia
Does this by reacting with hydrochloric acid to produce magnesium chloride and water
What is calcium hydroxide used for?
Slaked lime is used for neutralising acidic soil
What is the trend in the solubility of group 2 sulfates
Decrease as you move down
What is magnesium sulfate used for?
Epsom salts which are used in bath salts, fireproofing, laxatives
What is calcium sulfate used for?
Used to make plasters to keep bones still
What is barium sulfate used for?
Insoluble and opaque to X-rays, and can be taken as a barium meal to help act as a contrast medium
