2.1.5 redox

Question 1

what is the oxidation number for all uncombined elements

Answer 1

0

Question 2

what is the oxidation number of a monatomic ion

Answer 2

the same as the charge on the ion

Question 3

what is the sum of all the oxidation numbers in a molecular ion equal to

Answer 3

the charge of a molecular ion

Question 4

what do the oxidation numbers in a neutral compound add up to

Answer 4

0

Question 5

what is oxygens oxidation number

Answer 5

-2
unless in peroxides where it is -1

Question 6

what is hydrogens oxidation number

Answer 6

+1
unless in metal hydrides where it is -1 and molecular hydrogen (H2) where it is 0

Question 7

how do we show oxidation numbers in formulas

Answer 7

roman numerals

Question 8

what is a redox reaction

Answer 8

a reaction where both oxidation and reduction occurs simultaneously

Question 9

what is oxidation

Answer 9

oxidation is the loss of electrons

Question 10

what is reduction

Answer 10

reduction is the gain of electrons

Question 11

is an oxidising agent reduced or oxidised

Answer 11

reduced

Question 12

is a reducing agent reduced or oxidised

Answer 12

oxidised

Question 13

what happens to the oxidation number if an electron is lost

Answer 13

it increases

Question 14

what happens to the oxidation number if an electron is gained

Answer 14

it decreases