redox

Question 1

what is oxidation number

Answer 1

the number of electrons removed from an atom

Question 2

what is the 4 main rules for oxidation numbers

Answer 2

elements always have an oxidation no of 0
sum of oxidation number of a compound is 0
sum of oxidation number of a ion is its charge
the most electronegative element in a compound is always negative

Question 3

what is a hydride

Answer 3

a binary compound of hydrogen and a metal

Question 4

what are the 3 exceptions to the rule

Answer 4

oxygen is always -2 except as a peroxide and with fluorine where it is -1
hydrogen is always +1 except in a hydride where it is -1
chlorine is always -1 except with fluorine and oxygen

Question 5

what is a peroxide

Answer 5

a compund containing two oxygen atoms bonded together

Question 6

what do ate compound contain

Answer 6

oxygen and at least one other element

Question 7

what is an ide

Answer 7

a binary compund in which the non metal is give an ide suffix

Question 8

what is a reduction reaction and what is an oxidation reaction

Answer 8

loss of oxygen or gain of electron (decrease in oxidation number)
gain of oxygen or loss of electron (increase in oxidtation number)

Question 9

what is an oxidising and reducing agent

Answer 9

oxidising agents gain electron leading to oxidation elsewhere
reducing agents loose electrons leading to reduction elsewhere