Redox Reactions Flashcards

1
Q

What is oxidation?

A

Gain of oxygen

Loss of electrons

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2
Q

What is reduction?

A

Loss of oxygen
Gain of hydrogen
Gain of electrons

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3
Q

What is the oxidation number?

A

The charge an atom would have if it was composed of ions

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4
Q

What are the rules for oxidation numbers in compounds?

A

Overall charge is 0

Sum of oxidation numbers must equal 0

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5
Q

What are the rules for oxidation numbers in molecular ions?

A

Sum of the oxidation numbers must equal the overall charge on the ion

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6
Q

What is the oxidation number for an uncombined element?

A

0

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7
Q

What is the oxidation number for combine oxygen?

A

-2

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8
Q

What is the oxidation number for combined oxygen in peroxide’s?

A

-1

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9
Q

What is the oxidation number for combined hydrogen?

A

+1

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10
Q

What is the oxidation number for combined hydrogen in metal hydrides?

A

-1

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11
Q

What is the oxidation number for a simple ion?

A

The charge on the ion

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12
Q

What is the oxidation number for combined fluoride?

A

-1

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13
Q

What is a redox reaction?

A

Where both oxidation and reduction occur within a reaction

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14
Q

What happens in oxidation or reduction in terms of oxidation number?

A

Oxidation - increase in oxidation number

Reduction - decrease in oxidation number

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15
Q

What happens when metals react with acids in terms of redox?

A

Metal is oxidised

Hydrogen is reduced (forms hydrogen gas)

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16
Q

What are the steps for balancing a redox equation?

A
  1. Write out the oxidation numbers
  2. Separate the half equations
  3. Balance these equations with electrons
  4. Balance the redox process
  5. Balance remaining atoms by adding H+ or H2O