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Writing Chemical Formulae

Writing Chemical Formulae

A chemical formula is a concise way of giving information about the atoms that make up a particular chemical compound. A chemical formula shows each element by its symbol and also shows how many atoms of each element are found in that compound. The number of atoms (if greater than one) is shown as a subscript.

Revision of Chemical Formulae

The following exercise serves as revision. If you do not recall how to write chemical formulae refer back to Chemistry 102.


Write down the chemical formula for each of the following compounds:

  1. iron (III) chloride

  2. zinc nitrate

  3. aluminium sulfate

  4. calcium hydroxide

  5. magnesium carbonate

  6. the product when carbon reacts with oxygen

  7. the product when hydrogen reacts with nitrogen

  8. potassium oxide

  9. copper (II) bromide

  10. potassium dichromate

Write down the name for each of the following compounds:

  1. \(\text{SO}_{2}\)

  2. \(\text{KMnO}_{4}\)

  3. \((\text{NH}_{4})_{2}\text{SO}_{4}\)

  4. \(\text{BaF}_{2}\)

  5. \(\text{Cr}(\text{HSO}_{4})_{3}\)

  6. \(\text{CH}_{4}\)

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