Redox

Question 1

Combine

Li –> LI+ + e-
O2 + 4e- –>2O2-

Answer 1

4Li + O2 –> 4Li+ + 2O2-

Question 2

Whats the oxidation state of C in CaCO3

Answer 2

+4

Question 3

How do you combine 2 half equations ?

Answer 3

Balance the electrons in both equations
Add all products together and add all reactants together

Question 4

How do you balance a half equation ?

Answer 4

Balance main atom
Balance oxygen with H2O
Balance hydrogens with H+
Balance charge with e-

Question 5

What has happened to a element if the oxidation state has decreased ?

Answer 5

It has been reduced

Question 6

Is this reduction or oxidation ?

Na –> Na+ +e-

Answer 6

Oxidation

Question 7

Balance

O2 –> H20

Answer 7

4e- + 4H+ +O2 –> 2H2O

Question 8

What order should you assign oxidation states in ?

Answer 8

Uncombined metals
Metals
Fluorine
Hydrogen
Oxygen
Chlorine

Question 9

Is this reduction or oxidation ?

Fe3+ +e- –> Fe2+

Answer 9

Reduction

Question 10

What is the oxidising agent ?

Answer 10

Electron acceptor (itself is reduced)

Question 11

what has happened to a element if the oxidation state has increased ?

Answer 11

It has been oxidised

Question 12

Whats the oxidation state of V in VO2+

Answer 12

+5

Question 13

Name NO3-

Answer 13

Nitrate(V)

Question 14

What is the reducing agent ?

Answer 14

Electron donor (itself is oxidised)

Question 15

What is the oxidation state of a ion/complex ion ?

Answer 15

Its charge

Question 16

Whats the formula for Iron(II)Chloride ?

Answer 16

FeCl2

Question 17

What does OILRIG stand for ?

Answer 17

Oxidation is loss (of electrons)
Reduction is gain (of electrons)

Question 18

What is the oxidation state for a compound with no charge ?

Answer 18

0

Question 19

What is the oxidation state of a uncombined element ?

Answer 19

0