redox reactions

Question 1

what is the oxidation number of an uncombined element

Answer 1

0

Question 2

what is the oxidation number of an element combined with oxygen

Answer 2

-2

Question 3

what is the oxidation number of an element combined with hydrogen

Answer 3

+1

Question 4

what is the oxidation number of a simple ion

Answer 4

the charge of the ion itself determines the oxidation number

Question 5

what is the oxidation number of an element combined with fluorine

Answer 5

-1

Question 6

what are the exceptions with oxidation numbers

Answer 6

-oxygen bonded with fluorine has an oxidation number of +2
-oxygen in peroxides has an oxidation number of -1
-when bonded to metals in hydrogen/ hydrides has an oxidation number of -1

Question 7

what is an oxidation number

Answer 7

measure of the number of electrons that an atom uses to bond with atoms of another

Question 8

what are strong oxidising agent

Answer 8

transition metals

Question 9

what is a strong reducing agent

Answer 9

hydrogen

Question 10

what is disproportionation reaction

Answer 10

the same element is simultaneously oxidised and reduced

Question 11

what is it when oxidation number increases

Answer 11

oxidation

Question 12

what is it when oxidation number decreases

Answer 12

reduction

Question 13

what is a redox reaction

Answer 13

reaction where both oxidation and reduction occurs