Chemical formula - Molecular formula. 1  Molecular formulas indicate the simple numbers of each type of atom in a molecule of a molecular substance. 2  A molecular formula shows the number of elements in a molecule, and determines whether it is a binary compound, ternary compound, quaternary compound or has even more elements.
Fortunately, there is another resource available that allows you to get Hazard Perception Test practice in WA. They are online HPT practice tests provided by the South Australian version of the Department of Transport. The practice tests feature clips very similar to those in the real HPT.
Find out more about the Hazard Perception Test here. Note: Not all questions in the actual hazard perception test are included. Please note this test can only be practiced on your desktop or tablet (not your mobile phone). The hazard perception test will not work if you are using Internet Explorer 7 or 8. Please upgrade to a newer version or use a different browser.