Group 2

Question 1

Describe the trend in reactivity down the group

Answer 1

Reactivity increases
Nuclear charge increases
Atomic radius increases
The attraction between nucleus and outer electrons is less
Increase in shielding
The attraction decreases so less energy is needed to remove outermost electron
Stronger reducing agent

Question 2

Reaction with water
Using magnesium for equation

Answer 2

Mg doesn’t react but ca has effervescence and test produces squeaky pop

Mg + 2H20 = mg(oh)2 + h2

Question 3

Reaction with dilute acid

Answer 3

Both mg and ca produce effervescence
Gas tested produces a squeaky pop

Mg+ 2hcl = mgcl2 + h2

Question 4

Group 2 combustion

Answer 4

2mg + 02 = 2mgo.
Produces a bright flame for both mg and ca

Question 5

Reaction of group 2 oxide with water

Answer 5

Ca0 + h20 = ca(oh) 2
Increase in temp
Blue in universal indicator

Question 6

Describe the trend in solubility of group 2 hydroxides

Answer 6

As you go down they become more soluble as the size of the metal ion increases
The charge density gets lower so the ions split stay from each other more easily so there will be a greater concern of oh - ions in the water