Chemistry - Redox questions?

Question

a. What two changes would be observed when acidified potassium manganate (VII) is added to aqueous hydrogen peroxide?

b. Why is tin recycled?

c. What is the balanced equation for the thermal decomposition of tin (IV) chloride. Why can this decomposition be described as a redox reaction?

Answer 1

a) Colour change

Evolution of gas (Oxygen)

b) Because it is ecologically friendly and conserves energy.

c) SnCl4 -> SnCl2 + Cl2

Answer 2

The colour of the solution will change from purple to colourless as manganate ions are reduced.
The solution bubbles as oxygen is produced. (there is a scientific term for this but i forgot what is it... something that starts with e....scene i think)

tin is recycled because the cost of extracting tin is very expensive.

for (c), im not so sure about the answer... sorry!

Answer 3

Lancenigo di Villorba (television), Italy question n.a million "2 Na + S ---> Na2S" I broken it Na ---> Na+ + e S + 2e ---> S-- the place former writing ought to be doubled. it incredibly is a REDOX reaction on the grounds that Sodium differences its Oxidation variety (from 0 upto +a million) as Sulphur does (form 0 downto -2). question n.2 "C + O2 ---> CO2" i could not destroy it C + O2 ---> CO2 in spite of the undeniable fact that it incredibly is a REDOX reaction on the grounds that Carbon differences its Oxidation variety (from 0 upto +4) as Oxygen does (form 0 downto -2). question n.3 "Cl2 + 2 HBr ---> 2 HCl + Br2" I broken it Cl2 + 2e ---> 2 Cl- 2 HBr ---> Br2 + 2 H+ + 2e it incredibly is a REDOX reaction on the grounds that Bromine differences its Oxidation variety (from -a million upto 0) as Chlorine does (form 0 downto -a million). i'm hoping this helps you.

Answer 4

(c) SnCl4=SnCl2 +Cl2
Because
Sn4+ ion is reduced to Sn2+..