18-1/18-2: Oxidation Number

Question 1

How do you calculate oxidation number?

Answer 1

Number of electrons on the periodic table subtracted by the assigned valence electrons

Question 2

What is the difference between +1 and 1+?

Answer 2

oxidation number vs. charge on an ion

Question 3

What is the oxidation number for any element by itself?

Answer 3

0

Question 4

What is the oxidation number for hydrogen?

Answer 4

+1, 0, -1

Question 5

What is the oxidation number for any ionic compound?

Answer 5

The charge of the ions

Question 6

When is the oxidation number for hydrogen +1, 0, -1?

Answer 6

+1: When it has less electronegativity
0: When it is connected to another H or it is by itself
-1: When it has more electronegativity

Question 7

What is the oxidation number for oxygen?

Answer 7

0, -1, or -2

Question 8

When is the oxidation number for oxygen 0, -1, or -2?

Answer 8

0: By itself or connected to itself
-1: When it is in a peroxide
-2: In most substances (when most electronegative)

Question 9

What is the oxidation number for halogens?

Answer 9

0 and -1

Question 10

When is the oxidation number of halogens 0 or -1?

Answer 10

0: By itself or connected to itself
-1: If it is the more electronegative elemetnt

Question 11

What elements must you calculate the oxidation number for every time?

Answer 11

Carbon
Sulfur
Phosphorus
Nitrogen

Question 12

The sum of the oxidation numbers of polyatomic ions is equal to the _____.

Answer 12

charge on the ion