Group 2

Question 1

atomic radius trend

Answer 1

increases down the group, more shells of electrons making the atom bigger

Question 2

melting points

Answer 2

decrease down the group, metallic bonding weakens as the atomic size increases.

distance between the positive ions and delocalised electrons increases - electrostatic forces weaken

Question 3

reactivity

Answer 3

increases down the group

Question 4

Mg with O2 equation

Answer 4

2Mg + O2 > Mg(OH)2 + H2

Question 5

Mg with O2 observation

Answer 5

burns with a bright white flame, react slowly without a flame, white solid

Question 6

magnesium with steam eq

Answer 6

Mg + H2O > MgO + H2

Question 7

magnesium with water eq

Answer 7

Mg + 2H2O > Mg(OH)2 + H2

Question 8

group 2 metals general eq

Answer 8

metal + water > hydroxide + hydrogen

Question 9

fizzing

Answer 9

more vigorous down group

Question 10

metal dissolving

Answer 10

faster down group

Question 11

solution heating up

Answer 11

more down group

Question 12

white precipitate

Answer 12

less precipitate forms down group

Question 13

titanium reacted with magnesium eq

Answer 13

TiCl4 + 2Mg > Ti + 2MgCl2

Question 14

group 2 hydroxides solubility

Answer 14

more soluble down the group

Question 15

magnesium hydroxide with HCl eq

Answer 15

Mg(OH)2 + 2HCl > MgCl2 + 2H2O

Question 16

use of Mg(OH)2

Answer 16

medicine to neutralise acid

Question 17

calcium hydroxide with CO2 eq

Answer 17

Ca(OH)2 + CO2 > CaCO3 + H2O

Question 18

group 2 sulfates solubility

Answer 18

less soluble down the group

Question 19

use of BaSO4

Answer 19

barium meal - opaque to x-rays

Question 20

test for a sulfate ion

Answer 20

BaCl2 with HCl - sulphate ions are present if a white precipitate is formed