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Chemistry Module 2 (Barbara) > Redox > Flashcards

Flashcards in Redox Deck (15)
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1

What is the oxidation number of any element?

0

2

What is the oxidation number of an ion?

The same as the charge of the ion
(Cl- = -1)

3

What does the sum of the oxidation numbers in a molecule have to equal?

0

4

What is Fluorine's oxidation number?

-1 (ALWAYS)

5

What is Oxygen's oxidation number?

-2 (Normally)
-1 (in peroxide)
+2 (combined with fluorine)

6

What is Hydrogen's oxidation number?

+1 (apart from in metal hydrides)

7

Are metals positive or negative?

Always positive

8

What is reduction?

When the oxidation number of an element decreases

9

What is oxidation?

When the oxidation number of an element increases

10

What are half equations?

An equation split into 2, showing which elements are oxidised and which are reduced?

11

Split this equation into 2 half equations
Zn(s) + 2Ag+(aq) -> Zn^2+(aq) + 2Ag(s)

Zn(s) -> Zn^2+ + 2e-
2Ag+(aq) + 2e- -> 2Ag(s)

12

What is Chlorine's oxidation number?

-1 (almost always)

13

What do you call the ion that has an oxidation number that doesn't change?

Spectator ion

14

What is a redox reaction?

One where oxidation and reduction occurs

15

What is a disproportionation?

When the same element has been both oxidised and reduced