3.2 group 2 + halogens

Question 1

going down group 2 atomic radius:

Answer 1

increases

Question 2

going down group 2 first ionisation energy:

Answer 2

decreases

Question 3

going down group 2 melting point:

Answer 3

decreases

Question 4

would group 2 be reducing or oxidising agents?

Answer 4

reducing agents as another element will be reudced when they recieve the 2 electrons

Question 5

group 2 reaction with oxygen

Answer 5

Question 6

group 2 reaction with acids

Answer 6

Question 7

group 2 reaction with water

Answer 7

Question 8

down the group, solubility of hydroxides of group 2 elements:

Answer 8

increases

Question 9

use of Mg(OH)₂

Answer 9

sold as indigestion remedy

Question 10

use of Ca(OH)₂

Answer 10

limewater
treat agriculture to treat acidic soil

Question 11

use of CaCO₃

Answer 11

indigestion remedy

Question 12

group 2 oxide reaction with water

Answer 12

Question 13

properties of the halogens

Answer 13

• diatomic molecules
• instantaneous dipole-induced dipole

Question 14

down the group the boiling point of halogens: + why

Answer 14

increases because more electrons = stronger forces = more energy needed

Question 15

down the group the electronegativity of halogens: + why

Answer 15

decreases because shielding increases so electrons less attracted so electronegativty decreases

Question 16

what colour do the halogens go in water?

Answer 16

chlorine = pale green
bromine = orange-brown
iodine = brown

Question 17

how to tell the difference between bromine and iodine solutions

Answer 17

add cyclohexane and iodine = deep violet

Question 18

disproportionation reaction

Answer 18

when the same element is both oxidised and reduced

Question 19

chlorine reaction with water + oxidation states

Answer 19

Cl = 0 in Cl

Question 20

chlorine reaction with water + oxidation states

Answer 20

Cl = 0 in Cl₂
+1 in HClO
-1 in HCl

Question 21

use of Chloric(I) acid

Answer 21

used as bleach or to kill bacteria due to oxidising properties

Question 22

chlorine reaction with water in presence of sunlight

Answer 22

Question 23

sodium chlorate reaction with water

Answer 23

Question 24

chlorine reaction wtih diulte aq NaOH

Answer 24

Question 25

down the halogen group reducing power:

Answer 25

increases

Question 26

halogens are x agents

Answer 26

oxidising

Question 27

halid ions are x agents

Answer 27

reducing