copybook redox reactions Flashcards
1
Q
what is the colour change of potassium manganate in hydrogen peroxide and what does it indicate?
A
purple to colourless
indicates potassium manganate oxidised the peroxide (reduced itself)
2
Q
what is the colour change of potassium iodide in hydrogen peroxide and what does it indicate?
A
colourless to brown
potassium iodide reduced the peroxide (oxidised itself)
3
Q
oxidation?
A
- gain of oxygen
- loss of hydrogen
- loss of electrons
4
Q
Reduction?
A
- loss of oxygen
- gain of hydrogen
- gain of electrons
5
Q
why is a redox reduction + oxidation in one word?
A
reduction and oxidation take place together
6
Q
what is an oxidising agent?
A
a substance that reduces itself and oxidises another
7
Q
what is a reducing agent?
A
a substance that oxidises itself and reduces another
