EL8

Question 1

Calcium reacts with water

Answer 1

Bubbles, cloudy, calcium disappears

Question 2

Magnesium reacts with water

Answer 2

Unreactive, doesn’t dissolve. Faster with steam where mg burns with a bright white flame to form hydrogen and magnesium oxide (a white powder)

Question 3

Thermal decomposition of group 2 carbonates

Answer 3

MCO3 (s) =MO (s)+ CO2(g)

Question 4

Thermal stability down group 2

Answer 4

Increases down the group as the ion has a lower charge density and distorts the carbonate ion less so more energy needed to break bond.

Question 5

Solubility of hydroxides down group 2

Answer 5

Increases

Question 6

Solubility of carbonates down group 2

Answer 6

Decreases

Question 7

What’s enthalpy?

Answer 7

Kjmol-1
Energy per mole

Question 8

Reactivity down group 2 with water

Answer 8

Increases. Metal oxides of group 2 elements react with water to form metal hydroxides. Alkalinity and solubility increases down.

Question 9

Group 2 reactions with oxygen

Answer 9

Forms oxides. Strontium and barium react with excess oxygen to form metal peroxides.