QA A Level lesson on empirical and molecular formulae from masses and percentages, including the formula of a hydrated salt. Slides, sheets, answers.
Lesson 5 of a 23-lesson sequence on amount of substance. Pupils set out the divide-by-Ar table, decide when a ratio such as 1.33 must be scaled rather than rounded, find the molecular formula from the Mr, then work out a hydrated salt from the percentage of every element.
Two teaching cycles, each with a worked example, a gap-fill, a hinge question, a completion problem, whiteboards and a timed independent task.
What’s included: a teacher PowerPoint with answers revealed on click and full speaker notes (timings, what to look for, what each wrong answer means); a pupil PowerPoint with the answers removed, ready to print; a worksheet, a support sheet, extra practice and full worked answers as editable Word documents.
Specification: AQA AS and A Level Chemistry 7404/7405, 3.1.2 Amount of substance.
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£3.50