redox I

Question 1

define oxidation

Answer 1

loss of electrons
gain of oxygen/loss of hydrogen
oxidation number increases

Question 2

define reduction

Answer 2

gain of electrons
loss of oxygen/gain of hydrogen
oxidation number decreases

Question 3

define oxidation number

Answer 3

the charge the species in a molecule or ion would have if the bonding was 100% ionic

Question 4

define disproportionation

Answer 4

the simultaneous oxidation and reduction of atoms of the same element

Question 5

define oxidising agent

Answer 5

brings about oxidation
is reduced

Question 6

define reducing agent

Answer 6

brings about reduction
is oxidised

Question 7

what is the oxidation number of an uncombined state

Answer 7

0

Question 8

what is the oxidation number of hydrogen (except in metal hydrides)

Answer 8

+1

Question 9

what is the oxidation number of hydrogen in metal hydrides

Answer 9

-1

Question 10

what is the oxidation number of hydrogen in metal hydrides

Answer 10

-1

Question 11

what is the oxidation number of flourine

Answer 11

-1

Question 12

what is the oxidation number of oxygen (except in compounds with flourine or peroxides)

Answer 12

-2

Question 13

what is the oxidation number of oxygen in compounds with flourine or peroxides

Answer 13

-1

Question 14

what is the oxidation number of chlorine (except in compounds with flourine or oxygen)

Answer 14

-1

Question 15

how to write redox half equations

Answer 15

1 identify atoms which change oxidation numbers + write out numbers
2 balance with e–
3 balance O with H2O
4 balance H with H+
5 check charges are equal each side

Question 16

how to convert 2 half equations into 1 redox equation

Answer 16

1 multiply up half equations so the e– cancel out
2 add the equations, cancelling e– and H+ and H2O