GCSE Chemistry
Online GCSE Chemistry tutoring
GCSE Chemistry for Years 9 to 11, combined or separate, taught by tutors who sat these papers recently. We teach the calculation half of the course properly, because that is where most of the lost marks are.
Chemistry is two subjects wearing one name
Half of GCSE Chemistry is recall and explanation: bonding, structure, the periodic table, rates, organic chemistry, the atmosphere. The other half is arithmetic with chemical meaning attached: moles, relative formula mass, concentration, percentage yield, atom economy, titration.
Students are usually comfortable with one half and quietly avoid the other. Because around 20% of the marks in GCSE Chemistry test mathematical skills, avoiding the calculation half puts a hard ceiling on the grade no matter how well the rest is known.
Where the calculation marks are lost
Almost never in the chemistry. Consistently in the handling:
- Units. Grams against kilograms, cm³ against dm³. A correct method with an unconverted volume is a wrong answer, and it is the single most common error in titration calculations.
- Unbalanced equations. Every mole ratio downstream depends on the balancing being right, so one slip at the start invalidates everything after it.
- Significant figures. Marks are specifically allocated to this and are specifically thrown away by students who give a calculator display to nine decimal places.
- Not showing working. As in maths, method marks survive a wrong answer. Only if the method is on the page.
These are mechanical faults with mechanical fixes. They respond faster to targeted practice than almost anything else on the specification, which is why we look for them in the first diagnostic.
The topics that quietly cost the most
Across the mock papers we mark, the same handful of areas account for a disproportionate share of lost marks, and they are rarely the ones students say they find hard:
- Electrolysis. Students can usually state what happens at each electrode and still cannot explain why, or write the half equations. The explanation marks are the ones on offer.
- Bonding and structure. Dot-and-cross diagrams are easy marks that get thrown away on missing outer shells or the wrong number of electrons, and "explain the property from the structure" questions need a chain of reasoning, not a definition.
- Rates and equilibrium. Collision theory is memorised as a phrase and then not applied to the specific change the question describes.
- Organic chemistry. Naming, homologous series and reaction types are pure marks for anyone who has drilled them, and are usually taught last.
Required practicals
Combined Science has six chemistry required practicals within its 21; separate Chemistry has eight. They are examined on paper — variables, method, sources of error, how you would improve it — rather than in the lab, and they come up reliably every year.
Combined and separate are not the same course
On AQA, Combined Science chemistry is two papers of 1 hour 15 minutes at 70 marks; separate Chemistry is two papers of 1 hour 45 minutes at 100 marks and includes content Combined leaves out. Students revising from the wrong set of notes is a more common problem than it should be, and it is usually discovered in a mock rather than in September.
How we teach it
- Timed questions from the first lesson. Not at the end of the course, when there is no time left to fix what they reveal. Students who only ever work untimed are practising a different skill from the one being examined.
- Work set between lessons, and marked. An hour a week changes very little on its own. The work in between is where the grade moves, so it is set, submitted and comes back with feedback.
- A full paper under exam conditions every four weeks. Same timing, same silence, no notes. The score is recorded so progress is a number, not an impression.
- Written progress to parents every fortnight. What was covered, what the scores were, what we are working on next.
- Groups capped at five, or one-to-one if that suits better.
Start with the free diagnostic
Every student begins the same way: one full hour under exam conditions, marked against the real mark scheme, followed by a written summary of exactly where the marks are going and what we would do about it. It costs nothing, and you keep the assessment whether or not you carry on with us.
Other subjects we teach
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