Group 2 And 7

Question 1

Hot concentrated sodium hydroxide and chlorine

Answer 1

3Cl2+6NaOH—->NaClO3+5Nacl+3H20

Question 2

Test for carbonates

Answer 2

Add any acid egHCl then co2 should be released.Bible with limewater if cloudy then it’s present

Question 3

Test for sulfates

Answer 3

Add HCl then barium chloride Bacl2 if present white precipitate forms

Question 4

Halides

Answer 4

Add nitric acid then silver nitrate a precipitate forms.
Silver chloride is white
Silver bromide is cream
Silver iodide is yellow

Question 5

Ammonia

Answer 5

Red Litmus paper turns blue if ammonia has present

To see if NH4 present add sodium hydroxide and warm then it should be given iff

Question 6

Reactions with water oxygen and acid

Answer 6

M+2H20—>M0H)2+H2
2M+02—->2MO
M+2Hcl—>Mcl2+H2

Question 7

Chlorine water and potassium bronode reaction

Answer 7

Cl2+KBr—->yellow/orange

Question 8

Chlorine wayer snd potassi iodide

Answer 8

Cl2+2KI—->ornge brown/purple

Question 9

Bromine water and potassium iodide

Answer 9

Br2+2KI—>orangebrown/purple

Question 10

reactivity down group 2

Answer 10

reactivity increases
due to increasing atomic radius and shielding effect the ionisation energy decreases
it is easier to lose electrons as you go down the group

Question 11

water and chlorine

Answer 11

H20 +Cl2=hclo+hcl

hclo+h2o=h30+ +clo-