2.1.5 redox

Question 1

What is the rule for oxidation number of elements?

Answer 1

The oxidation number is always 0 for elements.

Question 2

What are the rules for oxidation number of compounds and ions?

Answer 2

Oxygen- -2
Hydrogen- +1
Florine- -1
Group 1 elements- +1
Group 2 elements- +2
Group 7 elements- -1

Question 3

What are the special cases for oxidation number in compounds and ions?

Answer 3

Hydrogen in metal hydrides- -1
Oxygen in peroxides- -1
Oxygen bonded to Florine- +2

Question 4

What is the sum of all oxidation numbers?

Answer 4

The total charge.

Question 5

Why are roman numerals used when naming compounds?

Answer 5

Roman numerals show the oxidation state/number of the element without a sign.

Question 6

What is a redox reaction?

Answer 6

Redox reactions involve both reduction and oxidation.

Question 7

What is reduction and oxidation (redox) ?

Answer 7

Reduction is the gain of electrons and oxidation is the loss of electrons.

Question 8

What is reduction and oxidation in terms of oxidation number?

Answer 8

Reduction is a decrease in oxidation number and oxidation is an increase in oxidation number.

Question 9

What is the reaction between a dilute acid and metal?

Answer 9

Dilute acid + metal —> salt + hydrogen