3- Redox I

Question 1

What is oxidation?

Answer 1

loss of electrons

Question 2

What is reduction?

Answer 2

gain of electrons

Question 3

What are oxidising agents?

Answer 3

something that forces another species to be oxidised so it itself gains electrons and therefore is reduced

Question 4

What are reducing agents?

Answer 4

something that forces another species to be reduced so it itself loses electrons so is oxidised

Question 5

What is a disproportionation reaction?

Answer 5

a reaction that involves one species that is simultaneously oxidised and reduced

Question 6

What is an oxidation number?

Answer 6

the charge that an ion has or the charge that it would have if it were fully ionic

Question 7

What is the oxidation number of an uncombined element?

Answer 7

zero

Question 8

What is the sum of oxidation numbers in a neutral compound?

Answer 8

zero

Question 9

What is the sum of oxidation numbers in an ion?

Answer 9

the sum is equal to the charge

Question 10

Does the more electronegative element have a positive or negative oxidation number?

Answer 10

negative

Question 11

What is the oxidation number of fluorine (always)

Answer 11

-1

Question 12

What is the oxidation number of hydrogen?

Answer 12

+1
or with less electronegative elements it is -1

Question 13

What is the oxidation number of oxygen?

Answer 13

-2
peroxides: -1
fluorine: +

Question 14

How will oxidation numbers change during reduction?

Answer 14

decreases

Question 15

How will oxidation numbers change during oxidation?

Answer 15

increase

Question 16

What is a systematic name of a compound?

Answer 16

when the oxidation state of an element is shown with roman numerals

Question 17

What must you make sure is the same when combining half equations to make a full equation?

Answer 17

the number of electrons