Group 2 Flashcards
(32 cards)
What happens to atomic radius down group 2?
It increases
Why does atomic radius increase down group 2?
The number of electron shells increases
What happens to first ionisation energy down group 2?
It decreases
Why does first ionisation energy decrease down group 2?
Atomic radius and shielding increases
What happens to melting point down group 2?
It generally decreases
Why does melting point generally decrease down group 2?
Atomic radius increases so attraction between the metal ions and delocalised electrons decreases
Which element in group 2 doesn’t follow the general trend in melting point and how?
Magnesium is much lower than expected
How does magnesium react with water?
Extremely slowly
How does magnesium react with steam?
Readily
How do calcium, strontium and barium react with water?
With increasing reactivity
What is produced when magnesium reacts with water?
Magnesium hydroxide and hydrogen
What is produced when magnesium reacts with steam?
Magnesium oxide and hydrogen
What is observed when magnesium reacts with steam?
Bright white light
What happens when calcium, strontium and barium react with water?
Calcium/strontium/barium hydroxide and hydrogen
What is magnesium used for?
The extraction of titanium from TiCl4
How does the solubility of the group 2 hydroxides change down the group?
It increases
What is produced when NaOH is added to magnesium ions?
A thick white precipitate
What is produced when NaOH is added to calcium ions?
A white precipitate
What is produced when NaOH is added to strontium ions?
A thin white precipitate
What is produced when NaOH is added to barium ions?
A very thin white precipitate
What is magnesium hydroxide used for?
Antacid
What is calcium hydroxide used for?
Neutralising acidic soil
What is calcium oxide/carbonate used for?
To neutralise sulfur dioxide in flue gases
How does the solubility of the group 2 sulfates change down the group?
It decreases
