Redox

Question 1

What is an oxidation number?

Answer 1

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

Question 2

What is the oxidation number of an uncombined element?

Answer 2

0

Question 3

What is the oxidation number of combined oxygen such as h20?

Answer 3

-2

Question 4

What is the oxidation number of oxygen in peroxides?

Answer 4

-1

Question 5

What is the oxidation number of combined hydrogen in NH3 or H2S

Answer 5

+1

Question 6

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

Answer 6

-1

Question 7

What is the oxidation number of a simple ion?

Answer 7

Charge on the ion.

Question 8

What is the oxidation number of combined fluorine such as NaF, CaF ?

Answer 8

-1

Question 9

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

Answer 9

Written as a Roman numeral

Question 10

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

Answer 10

+3

Question 11

What are oxyanions?

Answer 11

Negative ion that have an element along with oxygen

Question 12

What is the oxidation number of S in SO4 2-

Answer 12

O4 is -8
2- makes it -6
-2 —8 = +6

Question 13

Define oxidation in terms of electron transfer and oxidation number

Answer 13

Loss of electrons and increase in oxidation number

Question 14

Define reduction in terms of electron transfer and oxidation number

Answer 14

Gain of electrons

A decrease in oxidation number

Question 15

What is a redox reaction?

Answer 15

A reaction in which both oxidation and reduction takes place

Question 16

What is the oxidation number of a metal?

Answer 16

0 because it is an uncombined element

Question 17

What is disproportionation?

Answer 17

A reaction in which a substance is simultaneously oxidised and reduced giving 2 different products