Redox

Question 1

what is a redox reaction?

Answer 1

it is a reaction where both oxidation and reduction occurs at the same time

Question 2

what happens to the oxidation state in oxidation?

Answer 2

it increases

Question 3

what happens to the oxidation state in reduction?

Answer 3

it decreases

Question 4

what happens to hydrogen in oxidation?

Answer 4

loss of hydrogen

Question 5

what happens to hydrogen in reduction?

Answer 5

gain of hydrogen

Question 6

what happens to oxygen in oxidation?

Answer 6

gain in oxygen

Question 7

what happens to oxygen in reduction?

Answer 7

loss of oxygen

Question 8

what happens to the electrons in oxidation?

Answer 8

loss of electrons

Question 9

what happens to the electrons in reduction?

Answer 9

gain in electrons

Question 10

what is the usual oxidation state of an element?

Answer 10

it is usually 0

Question 11

what is the usual oxidation state of hydrogen?

Answer 11

it is usually +1

Question 12

what is the usual oxidation state of oxygen?

Answer 12

it is usually -2

Question 13

what is the sum of the oxidation states of a compound?

Answer 13

it is usually 0

Question 14

what is an oxidising agent?

Answer 14

it oxidises another substance while it is being reduced

Question 15

how to test for reducing agents with acidified potassium manganate (VII)?

Answer 15

in the presence of a reducing agent, acidified potassium manganate (VII), turns from purple to colourless.

Question 16

how to test for reducing agents with acidified potassium dichromate (VI)?

Answer 16

in the presence of a reducing agent, acidified potassium dichromate (VI), turns from orange to green

Question 17

what is a reducing agent?

Answer 17

it reduces another substance while it is being oxidised

Question 18

how to test for the presence of oxidising agents?

Answer 18

in the presence of an oxidising agent, aqueous potassium iodide, turns from colourless to reddish brown