Applied Science AQA/Amount of Substance

Topic Title Setting Applied context Chemical engineers and synthetic chemists rely on their knowledge of mole and reaction stoichiometries to determine reacting masses and yields for large-scale industrial production of chemicals. Analytical chemists also apply similar concepts in quantitative analysis, together with the selection of correct reagents to ensure accuracy of outcomes.  Syllabus ContentWhat you need to do•    the mole as the amount of a substance that always contains the same number of entities (eg atoms, molecules, ions, electrons) •    the relationship between mass of substance and amount in moles, moles = mass Mr •    the relationship between volume of gas at RTP and STP and amount in moles, PV = nRT •    concentrations of solutions in terms of mol dm–3 and g dm–3 •    molecular formulas •    empirical formulas •    calculating empirical formulas•    writing balanced equations for typical reactions including: •    acid–base neutralisation •    thermal decomposition •    acid/metal •    acid/carbonate •    precipitation •    combustion reactions•    calculating reacting masses based on correct stoichiometries •    equivalence point of an acid–base titration •    how the choice of indicator for an acid–base titration depends on the types (strengths) of acid and base used and the resulting pH titration curve •    calculating unknown concentrations and volumes from results involving volumetric analysis (limited to acid–base titrations); moles = vol (dm3) x concentration (mol dm–3) •    plotting and interpreting pH curves. Exploration of key ideas (must be original text, not C&P) – level checked by AQA In general, point students towards the approach to take, as opposed to just giving them information. Concept 1 explanation 1 alt=mad scientist|thumb|mad scientist Concept 2 explanation 2 Concept 3 explanation 3 Concept 4 explanation 4 Study Task Work to do to understand this topic e.g. research, analysis Careers and Organisations Carry out some research into these jobs in this area. (Feel free to add other jobs you find.) Research these roles: What are the benefits of this role to society?What organisations would employ someone in this role?  (Where would they work?)What would someone in this role have to do within the organisation?What scientifically-related skills do they need to have?  What techniques do they need to have mastered?What experience is needed to undertake this role and its responsibilities within an organisation?What other science personnel will they work with in their organisation.Job 1Job 2 Relevant practical/s – relating to criteria skills Quick questions quick questions Solution click to reveal answer hidden Exam-style questions – can we use old AQA qs… e.g. from more than 5 years ago? With Examiner comments Solution click to reveal answer hidden Links to other sections within this book to good external websites (including AQA website, wikipedia, relevant applications / companies) - also considering links in spec References / Bibliography of recommended text books including mapped refs to existing books Back to Contents