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Chemistry > Redox > Flashcards

Redox Flashcards

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1
Q

What is the oxidisation state of an element?

A

A measure of how oxidised that element is or the charge on the ion

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2
Q

What is the definition of oxidation?

A

-Loss of electrons

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3
Q

What is the definition of reduction?

A

-Gain of electrons

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4
Q

What is a reducing agent

A

-Loses electrons (is oxidised)
-Electron donator

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5
Q

What is an oxidising agent?

A

-Gains electrons (is reduced)
-Electron acceptor

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6
Q

In a neutral compound the sum of the oxidation state is equal to…

A

Zero

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7
Q

In a molecular ion the sum of the oxidation states is equal to the…

A

Overall charge

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8
Q

Any uncombined element has an oxidation state of…

A

0

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9
Q

Group 1 method in compounds have a ….. oxidation state

A

+1

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10
Q

Group 2 metals in compounds have a…

A

+2 oxidation state

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11
Q

What oxidation state does aluminium, iron (III) etc. have?

A

+3

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12
Q

What is the oxidation state of hydrogen in compounds (except metal hydrides)

A

+1

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13
Q

What is the oxidation state of hydrogen in metal hydrides? (e.g NaH)

A

-1

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14
Q

What is the oxidation of fluorine?

A

-1

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15
Q

Oxygen has a ……… oxidation state in compounds, oxides (except in compounds with F)

A

-2

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16
Q

Oxygen in peroxides has a… (H2O2)

A

-1 oxidation state

17
Q

Oxygen in superoxides has an oxidation state of…

A

-1/2

18
Q

Chlorine in compounds (except in compounds with O or F) has an oxidation state of…

A

-1

19
Q

How do you name oxoanions?

A

-Identify no. Of oxygen atoms
-identify total oxidation state due too oxygen
-identify charge of ion
-identify central atom oxidation state

20
Q

Oxidation means an ……….. in oxidation state

A

Increase

21
Q

Reduction means a ………. In oxidation state

A

Decrease

22
Q

How do you balance more complex half equations?

A
  1. Check the element that isn’t oxygen is balanced
    2.Balance for oxygen by adding water
    3.Balance for hydrogen by adding H+
  2. Balance charge by adding electrons
23
Q

To combine half equations electrons must…

A

Cancel out.

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