Developing Metals 4: Redox Recap

Question 1

What happens in a redox reaction

Answer 1

Electrons are transferred

Question 2

Technical names for what happens in a redox reaction

Answer 2

OIL RIG

Oxidation & Reduction

Question 3

OIL RIG = ???

Answer 3

Oxidation
Is
Loss of electrons

Reduction
Is
Gain of electrons

Question 4

Oxidising agent = ??? ( 2 )

Answer 4

• accepts electrons

- gets reduced

Question 5

Reducing agent = ??? ( 2 )

Answer 5

• donates electrons

- gets oxidised

Question 6

What happens to the oxidation state when oxidation takes place

Answer 6

Oxidation state increases by 1 for each electron lost

Question 7

What happens to the oxidation state when reduction takes place

Answer 7

Oxidation state decreases by 1 for each electron lost

Question 8

What do ionic half equation show

Answer 8

Oxidation OR Reduction

Question 9

What do 2 ionic half equations combined together make

Answer 9

Full equation
- no. of electrons lost & gained balances

• oxidation states also must balance

Question 10

Give full and half equations for zinc reacting with copper sulphate

Answer 10

-Full: Zn(s) + CuSO4(aq) —>
ZnSO4(aq) + Cu(s)

Oxidation state ^ ( 0 +2 —> +2 0 )

OIL: Zn —> Zn2+ +2e-

RIG: Cu2+ +2e- —> Cu

Question 11

In basic terms to do with redox reactions how does an electrochemical cell work

Answer 11

Connect 2 half equations and create a circuit = electrons flow around the system