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Coursework Rates of reaction

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IGCSE COURSEWORK COORDINATED SCIENCE Name: Gabriel Tudela Teacher: Date: April 06, 2009 TITLE: Factors affecting the rate of reaction: Investigating the effect of concentration on the rate of reaction Skill(s) assessed: Topic C10 [Experiment 9 (in S4)] Investigating the factors affecting the rate of reaction IGCSE Coursework Skills C2, C3, & C4 Some of the factors affecting the rate of a reaction that you have studied are: * Temperature * Concentration * Surface area Aim: Investigating the effect of changing the concentration on the reaction between calcium carbonate and hydrochloric acid, by collecting the carbon dioxide gas given off. CaCO3(s) + 2HCl(aq) --> CaCl2(aq) + H2O(l) + CO2(g) Hypothesis: My hypothesis is that as we increase the concentration of the HCl, the rate of the reaction will be faster; this is because more collisions will be present Materials: - Small calcium carbonate chips - Dilute hydrochloric acid (1 moldm-3) ...read more.


At the same time as you place the cork, start timing how much it takes to get 50cm3 of gas 10. Repeat this experiment using different concentrations of HCl acid by diluting the acid with distilled water, to make it a fair test use always the same amount of chips and always reach 25cm3 in the measuring cylinder so that only concentration and not amount will affect the rate of reaction 11. Record your results in a neat and tidy table Results: Table: Volume of 1.0 mol dm^-3 HCl (cm^3) Volume of H2O (cm^3) Concentration of HCl (mol dm^-3) Time (s) to reach 50ml Time to reach 100ml 5 20 0.2 38 133 10 15 0.4 17 35 15 10 0.6 9 18 20 5 0.8 7 13 25 0 1 5 10 Graph: Anomalous Results: In this experiment we were lucky to find no anomalous results at all, everything went on as we planned it was going to go like. ...read more.


At this last 2 differences, at the change from 0.6 to 0.8, and 0.8 to 1 in mol dm^-3 of concentration of HCl, the difference was in both only of 2s, showing off that if the acid was yet too concentrated, and almost getting to being fully concentrated, the difference in time to reach the 50ml will become smaller and smaller. Evaluation/Improvement: The experiment was carried out really well, there was no significant anomalous result which indicated that we were doing the right thing, the experiment fulfilled our hypothesis decision, it went on as we planned it would. We should have repeated the experiment, repeating the experiment would have given us much more accurate results, and we have used the same balance for each measuring of calcium carbonate, so that we make it a fair test. Markham College IGCSE SCIENCE Chemistry Coursework ...read more.

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This report briefly touches on all the main elements necessary. However it lacks depth and detail. In order to be successful more data should be collected and evaluated. Specific strengths and improvements have been suggested throughout.

Marked by teacher Cornelia Bruce 17/04/2013

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