Section Two: Formulas And Equations

Question 1

define the empirical formula and the molecular formula

Answer 1

empirical: Simplest whole number ratio of atoms of each element present in a compound

molecular: actual number of atoms of each type of element in a molecule

Question 2

how do you calculate the empirical formula and molecular formula?

Question 3

how to calculate relative atomic mass?

Answer 3

(abundance A x mass charge of A) + (abundance B x mass charge of B) ➗ total abundance

Question 4

how do you work out the formula of an ionic compound?

Answer 4

swap and drop method:
1. write ions
2. swap the charges
3. drop the charges
4. simplify to lowest whole number ratio (if needed)

Question 5

are salts an example of an ionic compound?

Answer 5

• yes, they can be hydrated or anhydrous (with or without water)