8.1 group 2 module 3

Question 1

what are group 2 elements called?

Answer 1

alkaline earth metals

Question 2

where are they found on Earth?

Answer 2

in stable compounds as they are reactive metals

Question 3

what do they form when reacted with water?

Answer 3

metal hydroxides

Question 4

why does pH increase in group 2 hydroxides as you go down the group?

Answer 4

OH- is more likely to dissolve as it becomes more soluble

Question 5

what do group 2 metals react with oxygen to produce?

Answer 5

metal oxide

Question 6

what does a group 2 metal oxide react with water to produce?

Answer 6

metal hydroxide

Question 7

what do group 2 metals lose in a reaction and what does this make them?

Answer 7

lose electrons as they are oxidised
this makes them good reducing agents

Question 8

what is the reactivity trend in group 2 metals?

Answer 8

reactivity increases down the group
atomic radius increases
nuclear attraction decreases
more shielding
electrons lost more easily

Question 9

what is the ionisation energy trend in group 2 metals?

Answer 9

ionisation energy decreases down through group
atomic radius increases
more shielding
less attraction so less energy needed to remove electrons

Question 10

what are some uses of group 2 compounds?

Answer 10

calcium hydroxide is added to fields as lime by farmers to increases the pH of acidic soils
it neutralises acid in the soil forming water

magnesium hydroxide used in indigestion tablets as it only produces a salt and water