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Chemistry: Foundations In Chemistry > Redox > Flashcards

Redox Flashcards

1
Q

What is the oxidation number of an element a measure of?

A

The number of electrons that an atom uses to bind

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2
Q

The sum of all oxidation number in a neutral compound is…

A

0

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3
Q

Sum of all oxidation number in a neutral compound = 0 examples

A

NaCl and Caco3

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4
Q

The sum of all oxidation numbers in an ion is equal to the…

A

Charge

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5
Q

Sum of all oxidation number in an ion = overall charge examples

A

SO4 2- so oxidation numbers sum to 2-

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6
Q

The oxidation’s number is any uncombined element is…

A

0

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7
Q

Uncombined elementary examples

A

Diatomics and single metals

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8
Q

The oxidation number of oxygen in any compound is…

A

-2

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9
Q

Exception of oxygen being -2 is…

A

Peroxides e.g. H2O2 where it’s -1

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10
Q

The oxidation number of hydrogen in any compound is..l

A

+1

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11
Q

Exception of hydrogen being +1 in a compound

A

Hydrides e.g. LiH where it’s -1

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12
Q

In a compound, a group 1 element always has an oxidation number of…

A

+1

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13
Q

In a compound, a group 2 element always has an oxidation number of…

A

+2

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14
Q

In a compound, a group 3 element always has an oxidation number of…

A

+3

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15
Q

What is different about group 7?

A

Can have different oxidation numbers

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16
Q

Group 7 exception

A

Fluorine

17
Q

What does it mean for the more electronegative element in the compound’s oxidation number?

A

A more negative oxidation number

18
Q

Exceptions

A

Metal hydrides = -1
Hydrogen peroxide = -1
Oxygen diflouride = +2

19
Q

Oxidation number +/- location

A

Before the number

20
Q

Charge +/- location

A

After the number

21
Q

How are elements that can have more than one oxidation state?

A

As a Roman numeral (systematic name) - typical for transition elements

22
Q

What are oxyanions?

A

Negative ions containing oxygen and 1 or more element

23
Q

Oxyanions usually end in?

A

-ate

24
Q

Examples of oxyanions

A

NO2 -, NO3 -, SO3 2-, SO4 2-

25
Q

What is a redox reaction?

A

A reaction where both oxidation and reduction take place

26
Q

What is oxidation?

A

The loss of electrons and increase in oxidation number

27
Q

What is reduction?

A

The gain of electrons and decrease in oxidation number

28
Q

How to determine a redox reaction

A

Changes in oxidation numbers and tracer of electrons

29
Q

What an oxidising agent?

A

A reagent that oxidise (takes electrons from) another element
Also the element that has been reduced

30
Q

What is a reducing agent?

A

A reagent that reduces (adds electrons to) another element
Also the element that has been oxidises

Chemistry: Foundations In Chemistry (15 decks)

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