Group 2

Question 1

what happens to reactivity going down the group

Answer 1

Going down the group, the metals become more reactive

Question 2

what happens to ionisation energy going down the group

Answer 2

first and second ionization energies decrease going down the group

Question 3

what happens to atomic radius going down the group

Answer 3

The atomic radius of the Group 2 elements increases going down the group

Question 4

what happens to melting point going down the group

Answer 4

• The melting point of the elements decreases going down the group as the outer electrons get further away from the nucleus
• This means that the attraction between the nucleus and the bonding electrons decreases causing a decrease in melting point

Question 5

what is produced when group 2 metals are reacted with water

Answer 5

all group 2 metals react with water producing a white light

Question 6

what is the equation with group 2 metals and water

Answer 6

M(s) + 2H2O(l) –> M(OH)(s) + H2(g)

Question 7

why is magnesium reacted with steam

Answer 7

because it is quite unreactive due to low atomic radius

Question 8

what happens when magnesium is reacted with steam and equation

Answer 8

• bright white light and white powder
  Mg(s) + H2O(g) = MgO(s) + H2(g)

Question 9

how is magnesium used to extract titanium from titanium chloride

Answer 9

2Mg(l) + TiCl4(l) = 2MgCl2(l) + Ti(s)
mg is used as a reducing agent

Question 10

what is solubility

Answer 10

• measurement of the maximum mass of a substance that will dissolve in a fixed volume of water at a particular temperature

Question 11

what is the solubility of magnesium hydroxide

Answer 11

sparingly soluble

Question 12

what is the trend of solubility of group 2 hydroxides down the group

Answer 12

increases making barium hydroxide very soluble

Question 13

how soluble is barium sulphate

Answer 13

insoluble

Question 14

what is the trend of solubility of group 2 sulphates down the group

Answer 14

decreases down the group MgSO4 is soluble

Question 15

what is the use of Mg(OH)2

Answer 15

used to treat indegestion as an antacid as it neutralises excess stomach acid as it is an alkali

Question 16

what is the use of Ca(OH)2

Answer 16

used to neutralise acidic soil to allow crops to be grown as its an alkali

Question 17

what is the use of CaO and CaCO3

Answer 17

used to remove SO2 from flue gases to prevent acidic rain as they are alkali

Question 18

what is the use of BaSO4

Answer 18

used as barium meal as the compound is insoluble in water and a good absorber of X-rays. BaSO4 is toxic but is stil used in the body as its insoluble and cant be absorbed

Question 19

what is the use of BaCl2

Answer 19

to test for sulfate ions