Chemistry Gcse Coursework Rates Of Reaction

Those obtaining grade 8 or higher, will be eligible to continue studying Chemistry at A level.There is no longer a coursework element to GCSE Chemistry.Some reactions take hundreds, maybe even thousands of years while other can happen in less than one second.The rate of reaction depends on the type of molecules that are combining.There are four main variables that could change the rate of a reaction: The concentration of the substance reacting - If there is more of a substance in a system, there is a greater chance that molecules will collide and speed up the rate of the reaction.If there is less of something, there will be fewer collisions and the reaction will probably happen at a slower speed.Hypothesis The rate of a reaction is the speed at which a reaction happens.If a reaction has a low rate, that means the molecules combine at a slower speed than a reaction with a high rate.

In an iodine clock reaction the same amount of mols are produced every time so to simplify the calculation you can cancel out the mols produced on top of the reaction and leave it as 1/t and this will let you compare rates.For a reaction to take place, the particles of the substances that are reacting have to collide.Only a certain fraction of the total collisions cause chemical change; these are called "successful collisions".The temperature - When you raise the temperature of a system, the molecules bounce around a lot more (because they have more energy). There are quite a lot of students who get shivers down the spine at the very thought of chemistry.The theory of practical work and How Science Works will be examined in the final written papers.Students will have many opportunities to gain and practise these skills throughout the three year course.The students are required to completed a minimum of 8 practical activity groups (PAGs) throughout the course.These are not formally assessed but these are a requirement.Ah right I see now, you're after the answer to one of the questions on the OCR Chemistry A Assessed Practicals for this year.The answer actually has nothing to do with 1/t being an estimate, it's worked out practically.

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