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 or 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, or H2S?

A

+1

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6
Q

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

A

-1

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7
Q

What is the oxidation number of a simple ion?

A

The charge of the ion

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8
Q

What is the oxidation number of combined flourine such as in NaF, or CaF2?

A

-1

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9
Q

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

A

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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16
Q

What is the oxidation number of a single metal atom?

A

0