20 - ocr specification a - coursework summary unit f321: atoms, bonds and groups · atoms and reactions · electrons, bonding and structure · the periodic table · unit f322: chains, energy and resources · basic concepts and hydrocarbons · alcohols, halogenoalkanes and analysis · energy · resources · unit f323:. Wwwgcse-sciencecom gcse twenty first century science candidate style answers specimen gcse twenty first century science additional science a a154 chemistry a a174 practical investigation factors that affect the rate of reaction of calcium carbonate. Rate of reaction- surface area how surface area effects the rate of reaction lesson for aqa chemistry- paper 2 (rate and extent of chemical change) fran- timms (0) free. For aqa, edexcel, ocr and wjec, the proportion of marks allocated to coursework dropped from 25 per cent of the total or rates of reaction candidates' work showed some evidence of preliminary research work but this was not always used to inform further investigation candidates used standard. Ocr the ocr specification is set out for three examination papers in addition to the coursework requirements, there are some suggested practical activities investigate the effect of a factor on the rate of an enzyme-controlled reaction the digestive system and digestion are not covered ocr specification suggests an.
Rhubarb rhubarb rhubarb this investigation looks at rates of reaction by using the reaction between oxalic acid in the rhubarb and potassium manganate vii as described, the investigation looks at concentration and surface area but temperature would be an easy addition rhubarb rhubarb - experiment guide. Rate equations show the relationship between the rate and the powers to which the reactant concentrations are raised if two reactants, a and b, react together then measurements of reaction rates with different concentrations of a and b (see below) could give the rate equation rate 5 k[a]x[b]y in this case: • k is the rate. Anjelina qureshi mrs gravell rates of reaction coursework chemistry year 11 rates of reaction introduction a chemical reaction occurs when things change from reactants into products these reactions only happen if the reacting molecules collide properly the rate of reaction is the speed of a reaction when the solution. The simplest initial rate experiments involve measuring the time taken for some easily recognisable event to happen very early on in a reaction i can see that it is just possible that you might be asked in principle how you would do it, but actually doing it could only reasonably be a part of a coursework exercise.
In this experiment, rhubarb sticks, which contain oxalic acid, are used to reduce and decolourise potassium manganate(vii) solution the experiment can be used to show how the rate of reaction is affected by surface area or concentration. Course information qualification: a level chemistry awarding body: ocr qualification code: h432 start date: anytime exam date: may/june duration: 360 hours support: tutor support and exam preparation coursework: chemistry practical endorsement (if required – not included in this course) course specification. The chemistry b (salters) coursework marking descriptors have been devised to allow a wide variety of types of investigation compare the effects of amount of solid catalysts such as manganese(iv) oxide and lead(iv) oxide on the rate of reaction by collecting the oxygen evolved in a gas syringe or using a data logger.
Use of catalyst – if a catalyst is present then the reaction rate will increase due to the fact it replaces the amount of energy we will be investigating the rates of reaction when we will mix together sodium thiosulphate and hydrochloric acid cambridge advanced series endorsed by ocr, chemistry 1 aqa additional. The main aim of my experiment is to find the rate of reaction over time taken and the rate of reaction when the concentration of hydrochloric acid increases or experiment for chemistry coursework for this investigation i am looking at how the concentration of acid can change the reaction and how i can explain this using. To determine the effect of altering temperature, oxygen concentration and addition of metal ion catalysts on the rate of reaction my hypotheses 1) temperature: i predict that at increased temperature, the rate of decomposition will increase and so larger titration values will be obtained in general for reactions, an increase of.