Group 2 And 7 Reactions

Question 1

Group 2 (Mg) + oxygen produces

Answer 1

Group 2 oxide (MgO)

Question 2

Group 2 (Ca) + water produces

Answer 2

Calcuim hydroxide (Ca(OH)2) + hydrogen (H2)

Question 3

Group 2 (Mg) + dilute acid (H2S04) produces

Answer 3

Group 2 sulphate (MgSO4) + Hydrogen (H2)

Question 4

Group 2 (Ca) + chlorine

Answer 4

Group 2 chloride (CaCl2)

Question 5

Group 2 Oxide (MgO) + water

Answer 5

Group 2 hydroxide (MgOH2) only

Question 6

Group 7 Halogen (Cl2) + metal Halide
(NaBr) that is less reactive

Answer 6

More reactive metal halide (NaCl)

Question 7

Group 7 (Cl) + water produces

Answer 7

Chloric(1) Acid (HClO) + hydrochloric acid (HCl)

Question 8

Group 7 halogen (Cl) + sodium hydroxide (NaOH) cold dilute produces

Answer 8

Sodium chlorate (NaClO) + Sodium chloride (NaCl) + water

Question 9

Describe a disproportionation reactions and give an example

Answer 9

A redox reaction where an element has been both oxidised and reduced.

Group 7 + water
Group 7 + cold sodium hydroxide

Question 10

how can you distinguish between the group 7 elements after a displacement reaction

Answer 10

using a non polar organic solvent eg cyclohexane to dissolve the elements.

Iodine appears violet (while brown in aq sol)

bromine appears orange (while brown in aq sol)

chlorine appears pale green (also pale green in aq sol)

Question 11

Cl2 + H2O -> ______

Answer 11

HClO + HCl

Question 12

Cl2 + NaOH(aq) -> ______

Answer 12

NaClO + NaCl (Bleach reaction)

Question 13

NaCl (Chloride) + Conc H2SO4 ->

Answer 13

NaHSO4 + HCl (Chlorine doesnt reduce H2SO4)

Question 14

NaBr (bromide) + Conc H2SO4->

Answer 14

NaHSO4 + HBr, also produces SO4 gas in a different reaction as Br is a stronger reducing agent

Question 15

NaI (iodide) + Conc H2SO4->

Answer 15

NaHSO4 + HI, also produces SO4 gas, S8 sulphur and H2S as iodide is a more powerful reducing agent.