Group 2 Metals Flashcards
Write an equation for the first ionisation energy of magnesium
Mg (g) —> Mg+ (g) + e-
What happens at the first ionisation energy as you go down group 2
Why (3)
Decreases
Increased shielding
Atomic radius
Nucleus charge
How does reactivity with water change as you go down group 2
Why
Increases
As outer electrons further from nucleus and more electron shielding so electrons are lost more easily
Write equation with reaction with barium and water
Ba (s) + 2H20 (I) —> Ba(OH)2 (aq) + H2 (g)
Write and equation for the reaction of magnesium and steam
Mg (s) + H20 (g) —> MgO (s) + H2 (g)
What is the trend in hydroxide solubility down group 2
And proof
Increases down the group
Mg isnt soluble
Ba gives strong alkaline solution
What is the trend in sulphate solubility going down group 2
Proof why
Decreases down group 2
Mg is soluble
Ba is insoluble
What is the trend in melting point down group 2
Why
Decreases
Electrons is further from nucleus so weaker metallic bonds
What is the trend in atomic radius down group 2
Increases as there are more occupied electron shells down the group
What are flue gases
Gases produced by power stations which are harmful to the environment
What is Mg(OH)2 used for
Indigestion
What is the use of BaSO4
Why is this safe
Helps for xray
It isn’t harmful as Ba Sulphate is insoluble
