Redox

Question 1

Is oxidation loss or gain of electrons

Answer 1

Loss

Question 2

Is reduction loss or gain of electrons

Answer 2

Gain

Question 3

How to balance O atoms

Answer 3

Water

Question 4

How to balance charge

Answer 4

Electrons

Question 5

How to balance H atoms

Answer 5

H ions

Question 6

First step of balancing redox

Answer 6

Ensure elements are balanced

Question 7

2x if the reaction contains… it is redox

Answer 7

Reaction involves a metal atom
Reaction involves molecules and ions of the same nonmetal

Question 8

2x if the reaction contains… it is not a redox

Answer 8

Neutralisation
Precipitation

Question 9

Spectator ions in redox

Answer 9

Sodium
Potassium

Question 10

Define an oxidising agent

Answer 10

An oxidising agent is a substance that gains electrons during a chemical reaction and is reduced (it is itself reduced)

Question 11

Define an reducing agent

Answer 11

A reducing agent is a substance that loses electrons during a chemical reaction and is oxidised (it is itself oxidised)

Question 12

Where are the strongest oxidisers found

Answer 12

Bottom of p13

Question 13

Where are the strongest reducers found

Answer 13

Top of p13

Question 14

Are elements with low electronegativities reducers or oxidisers

Answer 14

Reducing agents

Question 15

Why are elements with low electronegativities reducers

Answer 15

Because they tend to form ions by losing electrons and so act as reducing agents.

Question 16

Are elements with high electronegativities reducers or oxidisers

Answer 16

Oxidising agent

Question 17

Why are elements with high electronegativities oxidisers

Answer 17

Because they tend to form ions by gaining electrons and so act as oxidising agents.

Question 18

Group for the strongest reducing agents

Answer 18

Group 1

Question 19

Group for the strongest oxidising agents

Answer 19

Group 7

Question 20

Use for oxidising agents and why

Answer 20

Inactivate viruses because of their effectiveness in killing fungi and bacteria.

Question 21

4 compounds/group ions/molecule that exist as oxidising agents

Answer 21

Hydrogen peroxide
Dichromate
Permanganate
Iodine

Question 22

Iodine use

Answer 22

Treat wounds

Question 23

Gas used as reducing agent and where its used

Answer 23

Carbon monoxide - use to extract metal from ore

Question 24

Potassium permanganate use

Answer 24

Used to treat skin infections

Question 25

Acidified dichromate colour change (oxidation)

Answer 25

orange to green

Question 26

Acidified permanganate changes (oxidation)

Answer 26

purple to colourless

Question 27

Why are titrations done under acidic conditions

Answer 27

So the H+ ions are there to facilitate the reaction