2.1.5 Redox Flashcards

1
Q

What is an oxidation number?

A

The number of electrons an atom uses to bond with any other atom

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2
Q

What is the oxidation number of an uncombined element such as C, H, O₂?

A

0

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3
Q

What is the oxidation number of combined oxygen such as in H₂O

A

-2

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4
Q

What is the oxidation number of oxygen in peroxides?

A

-1

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5
Q

What is the oxidation number of combined hydrogen such as in NH₃, H₂S?

A

+1

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6
Q

What is the oxidation number of combined hydrogen in metal hydrides such as LiH?

A

-1

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7
Q

What is the oxidation number of a simple ion?

A

Charge on the ion

e.g Na⁺ -> +1 Cl⁻ -> -1

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8
Q

What is the oxidation number of combined fluorine such as in NaF. CaF₂

A

-1

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9
Q

When an element has more than one stable oxidation number how is it indicated?

A

Written as a Roman numeral

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10
Q

What is the oxidation number of Fe in iron (III) chloride?

A

+3

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11
Q

What are oxyanions?

A

Negative ions that have an element along with oxygen

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12
Q

What is the oxidation number of S in SO₄²⁻

A

+6

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13
Q

Define oxidation in terms of electron transfer and oxidation number

A

Oxidation is:

  • Loss of electrons
  • An increase in oxidation number
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14
Q

Define reduction in terms of electron transfer and oxidation number?

A

Reduction is:

  • Gain of electrons
  • A decrease in oxidation number
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15
Q

What is a redox reaction?

A

A reaction in which both oxidation and reduction takes place

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