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Chemistry - Redox > Redox > Flashcards

Redox Flashcards

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0
Q

What is the oxidation state of an uncombined element? Eg: Na

A

0

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1
Q

Define Reduction

A

A gain of electrons, where the donor atom is itself oxidised

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3
Q

What is always transferred in a redox reaction?

A

Electrons

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4
Q

What is the use of finding Oxidation states?

A

To see what has been oxidised and in turn what has been reduced in a reaction

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5
Q

What is the oxidation state of N in HNO3 ?

A

+5

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6
Q

What is the general oxidation state of Hydrogen, and when does this number change?

A

Usually +1, except in metal hydrides

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7
Q

What is the oxidation state of elements Lithium to Francium?

A

Always +1 (Group 1)

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8
Q

What is the general oxidation state of Oxygen, and when does this change?

A

Generally -2 except in a Peroxide or with Flourine

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9
Q

What is the oxidation state of S in H2SO4 ?

A

+6

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10
Q

Define oxidation

A

Gain of electrons where the donator itself is reduced

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11
Q

When is an equation balanced?

A

When the number of atoms of each element is the same either side & the total charge on each side is the same.

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12
Q

What is the oxidation state of P in PCl5?

A

+5

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13
Q

What has been Oxidised and what has been Reduced in this reaction?:

CuO+Mg–>MgO+Cu

A

Cu (Copper) has been reduced (+2e’s)

Mg (Magnesium) has been oxidised (-2e’s)

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14
Q

What is the oxidation state of S in SO4(2-) ?

A

+6

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15
Q

What is Oxygen in this reaction?

Fe2O3 + Al –> Fe + Al2O3

A

A spectator ion

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16
Q

How many electrons have been gained in this reaction.

MnO4(-) –> Mn(2+)

A

5 electrons gained

Manganese reduced from +7 to +2

17
Q

Has Aluminium been oxidised or reduced in this equation?

Al –> Al(3+) + 3e-‘s

A

Oxidised

18
Q

What is the oxidising and reducing agent in this reaction?

Ca + Br –> (Ca(2+) + 2Br-)

A

Oxidising agent: Ca

Reducing agent: Br

19
Q

What is a half equation?

A

Two “halves” of the overall ionic equation for a redox reaction, used to show the oxidation and reduction of elements within the reaction

20
Q

What 3 things can only be added to balance/complete a redox reaction?

A

H+ ions
Electrons
H2O

Chemistry - Redox (1 decks)

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