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A-Level Chemistry > 16 - redox > Flashcards

16 - redox Flashcards

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1
Q

Define oxidation number

A

Number of electrons involved in bonding

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2
Q

What is an uncombined element?

A

Isn’t bonded to any other elements except itself

O~2 is uncombined

But H~2 O is combined

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3
Q

What is the oxidation number for an uncombined element?

A

Always 0

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4
Q

What is the oxidation number of combined oxygen?

A

-2

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5
Q

What is the oxidation number of combined hydrogen?

A

+1

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6
Q

What is a simple ion?

A

An ion from group 1 or group 17

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7
Q

What is the oxidation number of a simple ion?

A

The charge on the ion

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8
Q

What is the oxidation number of combined fluorine?

A

-1

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9
Q

An exception:

What is the oxidation number of hydrogen in a metal hydride?

A

-1 instead of +1

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10
Q

An exception:

What is the oxidation number of oxygen in peroxides?

A

-1 instead of -2

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11
Q

An exception:

What is the oxidation number of oxygen when it is bonded to fluorine?

A

+2 instead of -2

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12
Q

What does iron(III) chloride mean in terms of oxidation numbers?

A

The iron has an oxidation number of +3

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13
Q

What is an oxyanion and how do you identify one from a chemical name?

A

A negative ion with oxygen in it

They have “ate” at the end

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14
Q

What is unique about oxidation number of oxyanions?

A

The oxidation number refers to the thing in the oxyanion that isn’t oxygen

For example, phosphate’s oxidation number refers to the oxidation state of the phosphorus

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15
Q

What is the name of NO~2 -?

A

Nitrate(III) because the oxidation number of the nitrogen is +3

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16
Q

What do oxidation and reduction mean in terms of electrons?

A

Oxidation is loss of electrons

Reduction is gain of electrons

OIL RIG

17
Q

What is a redox reaction?

A

A reaction where oxidation and reduction happen in the same reaction

18
Q

What happens to oxidation number when a substance is oxidised?

A

Oxidation number goes up

If substance is reduced, oxidation number goes down

19
Q

How do you work out which elements have been oxidised or reduced from a chemical equation?

A

You take the charge of the element in the products away from the charge of the same element in the reactants

20
Q

What is a reducing agent and an oxidising agent?

A

Something that is oxidised is a reducing agent

Something that is reduced is an oxidising agent

I haven’t mistyped that

21
Q

What is the name of NaClO?

A

Sodium chlorate

A-Level Chemistry (25 decks)

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