physical chem; oxidation, reduction & redox reactions

Question 1

what is oxidation?

Answer 1

loss of e-

Question 2

what is reduction?

Answer 2

gain of e-

Question 3

what is an oxidising agent?

Answer 3

they gain e- & are reduced themselves

Question 4

what is a reducing agent?

Answer 4

they lose e- & are oxidised themselves

Question 5

what is the oxidation number for uncombined elements?

Answer 5

0

Question 6

what is the oxidation number for ions?

Answer 6

oxidation number is the same as the charge on the ion

Question 7

what is the oxidation number for group 1 elements?

Answer 7

always +1

Question 8

what is the oxidation number for group 2 elements?

Answer 8

always +2

Question 9

what is the oxidation number for group 3 elements?

Answer 9

always +3

Question 10

what is the oxidation number for aluminium?

Answer 10

always +3

Question 11

what is the oxidation number for hydrogen?

Answer 11

+1 except in hydrides its -1

Question 12

what is the oxidation number for chlorine?

Answer 12

-1 except if in a compound with F & O it would have a +ve value

Question 13

what is the oxidation number for fluorine?

Answer 13

always -1

Question 14

what is the oxidation number for oxygen?

Answer 14

-2 except in peroxides its -1 & in OF₂ its +2

Question 15

explain what oxidation is in terms of oxidation numbers

Answer 15

its an increase in oxidation number

Question 16

explain what reduction is in terms of oxidation numbers

Answer 16

its a decrease in oxidation number