Formulae & Equations

Question 1

What happens to the name of non-metal ions when they bond?

Answer 1

They change their name ending to -ide

Question 2

What name ending do non-metals combined with oxygen to form a negative ion take?

Answer 2

-ate

Question 3

What is the oxidation number of all uncombined elements?

Answer 3

Zero

For example, in O2 gas the oxidation number = 0

Question 4

What is the sum of oxidation numbers in a compound?

Answer 4

Zero

For example, in MgO, Mg = +2, O = -2, +2-2 = 0

Question 5

What does the sum of oxidation numbers equal in an ion?

Answer 5

The overall charge

For example, in NO3-, the sum of oxidation numbers = -1

Question 6

What is the oxidation number of Group 1 metals?

Answer 6

+1

Question 7

What is the oxidation number of Group 2 metals?

Answer 7

+2

Question 8

What is the usual oxidation number of Group 6 elements?

Answer 8

-2

Question 9

What is the usual oxidation number of Group 7 elements?

Answer 9

-1

Question 10

What is the oxidation number of oxygen?

Answer 10

-2

Except in peroxides (in H2O2 it is -1) or when combined with fluorine

Question 11

What is the oxidation number of hydrogen?

Answer 11

+1

Except in metal hydrides; for example, in NaH, hydrogen is -1