3 - redox

Question 1

oxidation

Answer 1

the process of electron loss (increase in oxidation number)

Question 2

reduction

Answer 2

the process of electron gain (decrease in oxidation number)

Question 3

rule for assigning oxidation numbers:

Answer 3

. uncombined elements have an oxidation number of 0
. oxidation numbers in a compound add up to 0
. the oxidation number of a monatomic ion is equal to the ion charge
. in a polyatomic ion the sum of the individual oxidation numbers of the elements adds up to the charge of the ion

Question 4

how do you name using oxidation number?

Answer 4

using roman numerals
eg. FeCl2 - iron (II) chloride
MnO2 - manganese (IV) oxide
K2SO3 - potassium sulfate (IV)

Question 5

what side are the electrons on in a reduction half equation?

Answer 5

the left (to the left to the left)

Question 6

what side are the electrons on in an oxidation half equation?

Answer 6

the right

Question 7

acid + metal ——>

Answer 7

salt + hydrogen

Question 8

disproportionation

Answer 8

the name for the reaction where an element in a single species oxidises and reduces at the same time