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Mathematical requirements and assessment objectives
This topic preserves AQA mathematical and assessment requirements without generating content.
10
Objectives
10
Flashcards
10
Questions
90 min
Study time
AqaA LevelChemistryPractical skills, mathematical requirements and assessment
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Syllabus checklist
What you need to know
10 objective pages available
Mathematical requirements5 objectives
- Use arithmetic and numerical computation in chemical calculations.
- Handle data, units, standard form, significant figures and uncertainty.
- Rearrange equations and use algebra in physical chemistry.
- Plot, interpret and analyse graphs.
- Apply geometry or trigonometry where required by chemical contexts.
Assessment objectives and paper structure5 objectives
- Demonstrate knowledge and understanding of scientific ideas, processes, techniques and procedures.
- Apply knowledge and understanding in theoretical, practical, qualitative and quantitative contexts.
- Analyse, interpret and evaluate scientific information, ideas and evidence.
- Recognise that A-level Paper 3 can assess any content and practical skills.
- Use synoptic links across physical, inorganic, organic and practical chemistry.
Key terms
MolarityYieldAbsolute uncertaintyEquilibrium Constant (Kc)Boyle's LawIndependent VariableDependent VariableMolar MasspHActivation Energy (Ea)Activation EnergyRate constant (k)
Exam tips
- Show all steps in calculations: Always show your working when performing calculations to ensure full marks.
- Show all workings in calculations: Always write down the formula used, the values substituted, and the units for each step in your calculations.
Common mistakes
- Incorrect unit conversion: Always convert volume to liters by dividing cm³ by 1000 before using it in calculations.
- Incorrect use of significant figures: Always match the number of significant figures in your final answer to the least precise measurement used in your calculations.
Practice preview
- What is the molarity of a solution prepared by dissolving 5.0 g of NaCl in enough water to make 250 cm³ of solution? (Molar mass of NaCl = 58.5 g/mol)
- Calculate the number of moles in 10.0 g of CaCO₃ (Molar mass = 100.1 g/mol).
- A reaction produces 2.5 moles of product from 1.0 mole of reactant A. If the reaction has a 75% yield, how many moles of reactant A were actually used?
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