Redox reactions

Question 1

oxidation

Answer 1

addition of oxygen/ loss of electrons

Question 2

reduction

Answer 2

loss of oxygen/gain of electrons

Question 3

oxidising agent

Answer 3

a species that receives electrons from another species, receiving one or more electrons, meaning it is therefore reduced.

Question 4

reducing agent

Answer 4

a species that donates electrons to another species, donating one or more so that it is then oxidised

Question 5

oxidation number

Answer 5

the charge that an ion has or the charge it would have if it were fully ionic.

Question 6

oxidation number of uncombined element

Answer 6

ZERO

Question 7

sum of oxidation numbers of neutral compound

Answer 7

ZERO

Question 8

sum of oxidation numbers of all elements in an ion

Answer 8

CHARGE OF THE ION

Question 9

oxidation number of more electronegative ion in a substance

Answer 9

NEGATIVE

Question 10

oxidation number of fluorine

Answer 10

-1

Question 11

oxidation number of hydrogen

Answer 11

+1 unless combined with a less electronegative element when is -1)

Question 12

oxidation number of oxygen

Answer 12

-2 (except in peroxide when is -1)

Question 13

what happens to oxidation number in oxidation?

Answer 13

increases

Question 14

what happens to oxidation number in reduction?

Answer 14

decreases

Question 15

disproportionation

Answer 15

simultaneous oxidation and reduction of an element in a single reaction,