3.2 Write the formula of a compound Flashcards
What is the key to writing the formula of ionic compounds
ForIonic compoundsthe + charges will balance out the - charges.
What is the key to writing the formula of covalent compounds
ForMolecular/Covalent compoundsthe prefixes included in the name are all that are needed to write the formula.
How do you determine the formula of ionic compounds
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
How do you determine the formula of covalent compounds
determine the number of each element based on the prefixes
put in order they are stated
What are hydrates
Some molecules contain H20 within their structure. These are called hydrates
How do you write the formula for hydrates
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.
