KS3 Chemistry tutors

In England, Key Stage 3 normally covers Years 7 to 9, ages 11 to 14. Chemistry sits within science. Schools can teach topics in different orders, so the year group alone does not tell a tutor what has been covered.

The topic guide below follows the England science programme of study. Scotland, Wales and Northern Ireland have their own curriculum policies; share the school’s course information if your child follows another system.

Support can address one misunderstanding, several connected gaps or preparation for an upcoming school assessment. Choose the starting point from current work before deciding how many lessons to arrange.

Use these areas to identify the help needed. A useful lesson goal names what the learner should be able to explain or do.

Consider this practice question: 5 g of salt dissolves in 100 g of water. No matter enters or leaves. What is the mass of the contents? The container’s mass is excluded.

An answer such as “100 g, because the salt has disappeared” confuses being invisible with no longer being present. Dissolving spreads the dissolved substance’s particles through the water. The salt remains part of the mixture, so its mass still counts: 100 g + 5 g = 105 g. Dissolving is different from melting.

A clearer answer is: “The contents have a mass of 105 g. The salt is still present in the solution, even though its crystals are no longer visible, and no matter has been lost.” A labelled particle sketch can connect that explanation to what the learner sees.

For a follow-up, change the numbers to 80 g of water and 4 g of salt under the same conditions. The answer is 84 g; the useful check is whether the learner can explain why without a prompt. Oak’s mixtures and solutions lesson provides related practice.

Here is a paper planning task. A pupil proposes using 5 g of sugar in cool water and 10 g in warm water to investigate the effect of temperature on dissolving time. They plan to explain any difference in time by pointing to temperature.

The problem is that both temperature and sugar mass change. That comparison cannot isolate the effect of temperature. A better plan identifies each variable plainly:

• Change water temperature, measured in °C: this is the independent variable.
• Measure time in seconds until no visible sugar crystals remain: this is the dependent variable and a defined endpoint.
• Keep sugar mass and crystal size, water volume and the stirring method the same: these are control variables.

A better response to the plan is: “I would use equal masses of the same sugar and keep the water volume and stirring the same. Then a difference in dissolving time could be investigated in relation to temperature. The original comparison changes two factors, so I cannot attribute a difference to temperature alone.”

This task concerns how long a fixed amount takes to dissolve. It does not measure the maximum amount of sugar that can dissolve. That distinction makes the conclusion match the question.

For follow-up practice, give the learner a plan that changes both stirring and temperature. Ask them to identify the extra change and repair the comparison. These are planning examples; they do not require a home experiment.

Take a recent answer, the school’s topic list and any assessment date to the first discussion. The following is a possible learning sequence to agree with a tutor:

Use a free introductory meeting to discuss goals, teaching approach and arrangements. Explain what your child finds difficult and ask how the tutor would adapt an explanation.

At KS3, particle explanations build on earlier work with materials and mixtures. These foundations lead into more detailed chemistry at KS4, including electron-based explanations of bonding. Extension can deepen the reasoning in a current topic before moving on.

If the school has already started GCSE content, share the course and exam board so the tuition can match it. GCSE Chemistry tuition is the next-stage route. For that transition, the guide to choosing a chemistry tutor for GCSE or A-level explains course-specific questions.

KS3 Science tuition is useful when the need also includes biology or physics.