Chemistry: Oxidation

Question 1

What happens when something is oxidised?

Answer 1

it loses electrons

Question 2

What is an oxidising agent?

Answer 2

species which accepts electrons

Question 3

In an ionic compound, what does the oxidation state tell us?

Answer 3

how many electrons have been lost or gained

Question 4

In a molecule, what does the oxidation tell us?

Answer 4

the distribution of electrons between elements of different electronegativity

Question 5

What is the oxidation state of an element in its uncombined state?

Answer 5

0

Question 6

What does a positive oxidation value tell us?

Answer 6

element has been oxidised, it has lost electrons

Question 7

What does a negative oxidation state tell us?

Answer 7

the element has been reduced, it has gained electrons

Question 8

What is the oxidation state of hydrogen?

Answer 8

+1 (except in metal hydrides where it is -1)

Question 9

What is the oxidation state of group 1 elements?

Answer 9

always +1

Question 10

What is the oxidation state of group 2 elements?

Answer 10

always +2

Question 11

What is the oxidation state of aluminium?

Answer 11

always +3

Question 12

What is the oxidation state of oxygen?

Answer 12

-2 (except in peroxides where it is -1 and in OF2 where it is +2)

Question 13

What is the oxidation state of fluorine?

Answer 13

always -1

Question 14

What is the oxidation state of chlorine?

Answer 14

-1 (positive value in F and O)

Question 15

What does the sum of all oxidation stated equal to?

Answer 15

0, they are neutral

Question 16

What does the oxidation of a complex ion equal to?

Answer 16

the charge of the ion