Unit 1: Section 7- Oxidation, Reduction and Redox Reactions

Question 1

What is oxidation?

Answer 1

the process of electron loss

Question 2

What is reduction?

Answer 2

the process of electron gain

Question 3

What is the oxidation number of uncombined elements?

Answer 3

0

Question 4

What is the total of oxidation numbers in a compound?

Answer 4

0

Question 5

What is the oxidation number of group 1 elements?

Answer 5

+1

Question 6

What is the oxidation number of group 2 elements?

Answer 6

+2

Question 7

What is the oxidation number of Al?

Answer 7

+3

Question 8

What is the oxidation number of H?

Answer 8

+1 or -1 in metal hydrides

Question 9

What is the oxidation number of F?

Answer 9

-1

Question 10

What is the oxidation number of Cl, Br, I?

Answer 10

-1, except in compounds with oxygen and fluorine

Question 11

What is the oxidation number of O?

Answer 11

-2
except in peroxides and compounds with fluorine where it is -1

Question 12

What is an oxidising agent?

Answer 12

electron acceptor

Question 13

What is a reducing agent?

Answer 13

electron donor

Question 14

What are the steps for redox reactions?

Answer 14

Species
Oxygen (balance with water)
Hydrogen (balance with H+)
Charges

Question 15

How do you use e- to write reduction and oxidation equations?

Answer 15

For reduction add e’s to reactants
For oxidation add e’s to products

Question 16

How do you combine two half equations?

Answer 16

• multiply the equations to make sure the number of electrons in both is equal
• then, put them together, and take the electrons out by cancelling them