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C7- OXIDATION, REDUCTION AND REDOX REACTIONS > 7.2- OXIDATION STATES > Flashcards

7.2- OXIDATION STATES Flashcards

1
Q

What are oxidation states used to see?

A

used to see what has been oxidised + what has been reduced in redox reaction

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2
Q

What does the oxidation state in an ionic compound tell us?

A

how many electrons it has lost or gained, compared with element in its uncombined state

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3
Q

What does the oxidation state in a molecule tell us?

A

tells us about distribution of electrons between elements of different electronegativity

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4
Q

What oxidation state is the more electronegative element given in an ionic compound/ molecule?

A

the more electronegative element given negative oxidation state

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5
Q

What is the oxidation state of every element in its uncombined state?

A

zero

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6
Q

What does a positive number for oxidation state show?

A

element has lost electrons + so has been oxidised

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7
Q

What does a negative number for oxidation state show?

A

element has gained electrons + so has been reduced

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8
Q

What does it say about oxidation, the more positive the number?

A

more positive the number, more the element has been oxidised

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9
Q

Oxidation state of hydrogen in compound?

A

+1 (except in metal hydrides e.g. NaH, where it’s -1)

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10
Q

Oxidation state of group 1 elements in compound?

A

always +1

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11
Q

Oxidation state of group 2 elements in compound?

A

always +2

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12
Q

Oxidation state of aluminum in compound?

A

always +3

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13
Q

Oxidation state of oxygen in compound?

A

-2 (except in peroxies where it’s -1, and compound OF2, where it’s +2)

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14
Q

Oxidation state of fluorine in compound?

A

always -1

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15
Q

Oxidation state of chlorine in compound?

A

-1 (except in compounds with F and O, where it has positive values)

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16
Q

What does the sum of oxidation states in compound equal to?

A

0

17
Q

Why does the sum of oxidation states in compound equal to 0?

A

as all compounds electrically neutral

18
Q

What does the sum of oxidation states of complex ions i.e. NH4+ or S04 2- equal?

A

charge on ion

19
Q

What does the most electronegative element in a compound always have? (hint- state)

A

negative oxidation state

C7- OXIDATION, REDUCTION AND REDOX REACTIONS (3 decks)

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