Redox

Question 1

What happens to the oxidation state of an element in an equation when it is oxidised?

Answer 1

The oxidation state increases

Question 2

What is an oxidising agent?

Answer 2

a chemical species, or reactant, which increases the oxidation number of the other species or substance

Question 3

What happens to the oxidation state of an element in an equation when it is reduced?

Answer 3

it’s oxidation state decreases

Question 4

What is a reducing agent?

Answer 4

a chemical species, or reactant, which decreases the oxidation number of the other species or substance

Question 5

What must you do to determine how a particular reactant has behaved?

Answer 5

to deduce the oxidation states within the chemical equation

Question 6

What is the oxidation state of an ion?

Answer 6

the number of electrons that must either be added or removed from that ion in prefer to give a neutral atom

Question 7

What do we imagine in terms of oxidation numbers in non-ionic compounds?

Answer 7

that the more electronegative atoms takes the electrons

Question 8

What are the rules of oxidation numbers?

Answer 8

-uncombined element= 0
-all atoms in a molecule add up to 0
-simple ion= charge of the ion
-molecular ion- adds up to charge of ion
-g1-3 metals+ +1, +2, +3
-fluorine atom+ -1
-hydrogen atom= +1 (some exceptions)
-oxygen atom- -2
-any other can then be calculated

Question 9

How can an overall redox equation for a reaction be constructed?

Answer 9

by combining the half equations showing