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Rates of Reaction.

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Chemistry Coursework: Rates of Reaction. Introduction: In class we are doing an experiment on rates of reaction. We will do this experiment using the chemicals Calcium Carbonate and Hydrochloric acid, CaCo + Hcl. We will use five different concentrations of hydrochloric acid and find out which is the correct concentration to use with out in being too reactive or not reactive enough. For this experiment to work there are many things that must happen; The particles must collide together and the particles will then have enough energy to start a reaction. Other things that can affect or change the rate of chemical reaction are; * Particle size, * Concentration of Solution, * Catalysts, * Temperature. This will be an experiment to investigate how concentration affects the rate of reaction. Prediction: I thick what will happen is when we add the Calcium Carbonate chips to the Hydrochloric acid there will be a reaction. This reaction will be caused by particles colliding with one another, this is because the concentration in the solution has been increased and that means there will be more particles. ...read more.


This will allow the carbon dioxide to travel from the conical flask where the reaction is taking place, to the measuring cylinder where we will be able to see how much carbon dioxide has been produced therefore we will be able to see how reactive the acid was. To make his a fair test we will keep all the equipment the same and will use the same amount of Calcium Carbonate chips ( ) We will also use the same amount of time to carry out the experiment. The only thing we will change is the concentration of the acid: o.5m, 0.75m, 1m, 1.25m, 1.5m. In this experiment the reason why we get a reaction is because of the collision theory, which is, when the acid is added to the CaCo chips the particles will collide together and the particles will have enough energy so they will react: Here are the results of our experiment: We can see from this table of results that as we add a stronger amount of Hydrochloric acid to the Calcium Carbonate chips the reaction increases and the reaction ends sooner than 60 seconds. ...read more.


Plan for Particle size and how it changes the rate of reaction: In this experiment we want to find out how particle size affects the rate of reaction between Calcium Carbonate and Hydrochloric acid, (CaCo , HCl) CaCo + HCl CaCl +Co +H O Prediction: I think if we reduced the size of the calcium carbonate chips and used powder the reaction would increase. This would be because the surface area is increased, giving a greater area for collisions to take place and so causing an increase in the rate of reaction. I think that the powder will react more vigorously with the acid than the larger chips. The powder has a larger surface area and so is exposed to many more collisions. Equipment: One Measuring Cylinder, (large) A container of water, One conical flask, One delivery tube, One retort stand, A stop watch, A fixed rate of Hydrochloric acid. Diagram: Fair Testing: To keep this experiment a fair test we will keep all apparatus the same and us the same concentration and amount of Hydrochloric acid. The only thing that will be changed is the amount and size of the Calcium Carbonate chips. (Large, Medium, Powder) ...read more.

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