Chemistry- Redox reactions

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  • Created by: Kitsune
  • Created on: 02-07-16 17:58
What is gain of oxygen called?
Oxidation
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What is loss of oxygen called?
Reduction
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What is rusting?
Oxidation of iron
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What happens to iron in the blast furnace?
It is reduced
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How do oxidation and reduction occur?
They occur together
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What is another word for burning?
Combustion
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What type of reaction is combustion?
Redox
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What about the electrons in redox reactions?
Oxidation is loss, reduction is gain
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How to show electron transfer?
Use half-equations
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How to show the ions present in the reaction?
Use ionic equations
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What does the oxidation state show?
The number of electrons an element loses, gains or shares in forming a compound
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What happens to an oxidation state during a redox reaction?
It changes
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What is a reducing agent?
It reduces another substance and is itself oxidised
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What is an oxidising agent?
It oxidises another substance and is itself reduced
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Which substances are strong oxidising agents?
The ones that have a strong drive to gain electrons
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What are two examples of strong oxidising agents?
Oxygen and chlorine
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What substances are strong reducing agents?
The ones that readily give up electrons
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What are three examples of strong reducing agents?
Hydrogen, carbon monoxide, sodium (reactive metals)
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Why does potassium manganate act as a strong oxidant?
In this compound manganese has an oxidation state of +7 but it is much more stable at +2 so it is strongly driven to reduce its state by gaining 2 electrons
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How does potassium manganate change colour in the presence of a reductant?
From purple to colourless
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As what agent does potassium iodide act?
Reducing agent
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How des potassium iodide change colour in the presence of an oxidising agent?
From colourless to red-brown
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Why are oxidising/reducing agents used in labs?
They show a colour change so they are a good visual indicator
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How are oxidising agents used outside of lab? Why?
Cleaning products- they kill bacteria, bleaches- they break down coloured compounds, breathalysers- potassium dichromate changes from orange to green
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What is used to dye hair?
Hydrogen peroxide
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Other cards in this set

Card 2

Front

What is loss of oxygen called?

Back

Reduction

Card 3

Front

What is rusting?

Back

Preview of the front of card 3

Card 4

Front

What happens to iron in the blast furnace?

Back

Preview of the front of card 4

Card 5

Front

How do oxidation and reduction occur?

Back

Preview of the front of card 5
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