3.2 Write the formula of a compound

Question 1

What is the key to writing the formula of ionic compounds

Answer 1

ForIonic compoundsthe + charges will balance out the - charges.

Question 2

What is the key to writing the formula of covalent compounds

Answer 2

ForMolecular/Covalent compoundsthe prefixes included in the name are all that are needed to write the formula.

Question 3

How do you determine the formula of ionic compounds

Answer 3

determine the charge of each ion
cross the charge of each ion to be the subscript amount of the other ion
divide by any common factors to get the simplest answer
Put cation before anion

Question 4

How do you determine the formula of covalent compounds

Answer 4

determine the number of each element based on the prefixes

put in order they are stated

Question 5

What are hydrates

Answer 5

Some molecules contain H20 within their structure. These are called hydrates

Question 6

How do you write the formula for hydrates

Answer 6

Their formulas include a dot that separates a number of H2O from the rest of the molecules, in naming the molecules include a prefix and change it to hydrate
e.g. CuSO4*5H2O is copper(II) sulfate pentahydrate.