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Consider this illustrative answer: “When water boils, its covalent bonds break.” The learner has named a type of bonding, but applied it to the wrong part of the structure.

Draw two water molecules, each labelled H₂O. Mark the covalent bonds within each molecule separately from the attractions between molecules. On boiling, intermolecular forces are overcome; the molecules remain intact. A clearer answer is: “Energy is needed to overcome forces between water molecules, allowing them to separate.”

In an online lesson, showing that drawing gives the tutor something specific to discuss. The learner can point to the attraction they mean before rewriting the explanation. For a follow-up, redraw several H₂O molecules without the labels and mark which attractions are overcome during boiling. The check is whether the learner can explain the distinction without copying the first answer.

This small-molecule distinction appears in AQA GCSE bonding content; it should not be applied to giant covalent structures.

Here is a constructed paper calculation for AQA GCSE Chemistry or Combined Science: Trilogy Higher Tier. 2.4 g of magnesium reacts completely with excess hydrochloric acid. Use a magnesium molar mass of 24 g/mol. How many moles of hydrochloric acid are consumed?

Mg + 2HCl → MgCl₂ + H₂

Here Mg is magnesium and HCl is hydrochloric acid. The products are magnesium chloride and hydrogen. The unit mol measures chemical amount; the molar mass tells us the mass of one mole.

In this constructed example, two runs have reactant A concentrations of 0.10 and 0.20 mol/dm³, with relative initial rates of 1 and 4. Other reactant concentrations and temperature are held fixed. Relative rates compare the two runs; 4 means four times the first rate.

The concentration doubles, while the rate quadruples. Since 2² = 4, the data indicate second order in A: under these conditions, rate depends on the square of A’s concentration. This pair alone does not establish the orders in other reactants or the overall order.

On screen, compare the concentration factor and rate factor side by side. Then try a fresh pair in which doubling A doubles the rate: that would indicate first order in A, because 2¹ = 2. Giving the reason tests more than remembering the phrase “second order”.

Experimental rate-order reasoning is full A-level content in AQA Chemistry 7405.

Microsoft Teams is Latimer’s default lesson platform; you and the tutor can agree another platform. Before a lesson, check that the learner can join, hear clearly and show their working. The examples above need readable symbols and a way to discuss each step, whether the learner writes on paper or digitally.

Compare the course experience described on a tutor’s profile with the help you need. The free introductory meeting is for discussing goals, teaching approach and arrangements. Use it to decide what you want the first teaching lesson to address.