This is a whole-lesson resource. Most diffusion practicals involve observation only - this resource asks students to measure and calculate. Further it has a set of results, obtained by real Year 7 students and a graph of their results. This is so all students have a standard set of results to compare their own results with and a standard set to interpret, so you can check their understanding. This resource also challenges students to use their knowledge of particles to help them analyse the results of comparing two different concentrations of acid.
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£3.00