Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Chemistry - S2 > Redox > Flashcards

Redox Flashcards

You may prefer our related Brainscape-certified flashcards:
AP® Chemistry flashcards Periodic Table flashcards Chemistry 101 flashcards Organic Chemistry 101 flashcards
1
Q

What is a redox reaction?

A

A redox reaction is a reaction in which oxidation and reduction occur in the same reaction.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

What is oxidation?

A
  • The gain of oxygen
  • The loss of hydrogen
  • The loss of electrons
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is reduction?

A
  • The loss of oxygen
  • The gain of hydrogen
  • The gain of electrons
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Explain the oxidation reaction - Combustion

A
  1. Combustion.
    This is when oxygen combines with fuels e.g. coal, oil etc., to produce carbon dioxide, water and ENERGY.
    It is to produce energy that the fuels are burnt.

Methane + oxygen  carbon dioxide + water + ENERGY

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Explain the oxidation reaction - Rusting

A
  1. Rusting
    This is an undesirable oxidation process.
      Iron + water + oxygen  iron (iii) oxide
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Explain the oxidation reaction - Burning of metals and non-metals to form oxides

A
  1. Burning of metals and non-metals to form oxides:

Burning magnesium:

Magnesium + Oxygen —> Magnesium Oxide
2Mg + O2 —> 2MgO

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Explain the reduction reaction - Electrolysis

A
  1. Electrolysis: -

Aluminium oxide is reduced to aluminium using electrolysis

Aluminium oxide  aluminium + oxygen

The oxygen is removed by ELECTROLYSIS.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Explain the reduction reaction - Blast Furnace

A
  1. Blast Furnace

Iron is produced in the blast furnace by the
reduction of iron oxide

Iron (iii) oxide + Carbon monoxide  iron + carbon dioxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Explain the reduction reaction - Haber process

A
  1. Haber Process:
    Nitrogen and hydrogen react together to produce ammonia

Nitrogen + hydrogen  ammonia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Explain the reduction reaction - Copper (ii) oxide

A
  1. Reduction of copper (II) oxide to copper using hydrogen:

Copper oxide + hydrogen  copper + Steam

Observations:
* Red solid changes to black
* Condensation on the glass tube

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the chemical name for rusting?

A

The chemical name for rust is hydrated iron (III) oxide.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What condition are needed for rusting?

A

Water, air and Iron

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Explain the two ways to prevent rusting?

A

Most ways of preventing rusting are simply barrier methods, which stop the moist air from coming into contact with the iron.

Sacrificial protection is when a metal more reactive than iron is plated onto an iron object, it will react first, sacrificing itself and protecting the iron from rusting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Explain the barrier method of preventing rusting - Painting

A

This is relatively cheap, and can be used to cover large areas e.g. bridges and gates. The paint prevents air or moisture getting at the iron.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Explain the barrier method of preventing rusting - Greasing

A

This is suitable for covering moving parts of machinery that would otherwise rub away paint. E.g. car engines, and bicycle chains. The oil prevents air getting at the item.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Explain the barrier method of preventing rusting - Plastic Coating

A

The iron object is covered with a plastic covering to prevent air and water from reaching the iron. E.g. handle bars on a bicycle.

13
Q

Explain the barrier method of preventing rusting - Stainless Steel

A

If iron is mixed with other substances, its properties will change. When iron is mixed with nickel and chromium, it becomes much harder, and no longer rusts. It is called stainless steel, and is used for car parts, kitchen sinks, and cutlery.

14
Q

Explain the barrier method of preventing rusting - Tin Plating

A

In this method, tin is used to coat the iron. Tin is used because it is less reactive, and non-toxic. The tin is deposited using electrolysis.

15
Q

Explain the barrier method of preventing rusting - Chromium Plating

A

Chromium, like tin, is plated onto the iron by electrolysis. Chromium is a shiny metal, and it is used in car bumpers.

16
Q

Explain the sacrificial protection method of preventing rusting - Galvanising

A

In this method, iron is coated with a layer of zinc, by dipping the object into molten zinc.

As zinc is more reactive than iron, even if the coating is scratched to expose the iron, the zinc, rather than the iron will react with the air.

Galvanising is suitable for items that will be stored outside, e.g. dustbins and wheelbarrows.

17
Q

Explain writing redox reactions in terms of electrons?

A

Look in book

Chemistry - S2 (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions