As mentioned in earlier post on Atoms, Molecules & Stoichiometry – there aren’t many differences in the Mole Calculations questions between GCE A-Level (Advanced Level) Chemistry & GCE O-Level (Ordinary Level) Chemistry, in terms of formulae and approach.
However, in GCE A-Level Chemistry (H1/H2), the examiners expect you to have a good grasp of Basic Chemistry knowledge i.e. topics in GCE O-Level Chemistry should be at your finger tips.
Take the following question that i recently gave it to my A-Level JC1 H2 Chemistry Weekly Class.
What is the mass of Zn obtained when 50g of Zinc Oxide is reduced by 50g of charcoal?
In this Mole Calculations question, students are expected to be able to write the balanced chemical equation based on the information given. Half of my students can’t write the balanced chemical equations! Because they have forgotten about the topic of Metals & Reactivity Series in GCE O-Levels!
Warning: Do not throw away your GCE O-Level Chemistry notes just yet. You might need it at times for quick revision.
Let’s take a look at the approach to solve this question.
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Recalling what we have learned in GCE O-Level Chemistry, when