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Chemistry SCIEP

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Introduction

S.C.I.E.P. My aim is to discover and investigate the relationship between the reactants and the rate of the chemical reaction. Basically i will work out what affects the rate of reaction and why. The reactants are marble chips and hydrochloric acid. We can carry out this investigation in several ways; first we can use a gas syringe connected to a test tube via a rubber tube, containing the reactants. This is shown in method 1. We can also displace the carbon dioxide into a tray filled with water which is then trapped in an upside down tube. See method 2. Method 1 _____________________________________ Method 2 Factors The rate of reaction between the marble chips and hydrochloric acid is affected by a number of variants such as temperature, concentration surface area and changing the quantity and air pressure. To make this a reliable experiment the factors that could affect the experiment will be controlled and measured. A thermometer will be used to so we can adjust the temperature accordingly. We cannot easily control the size of the individual marble chips but we decided to use small marbles chips of similar size, instead of medium or large. We will also restrict the weight of the marble chips to 2 grams to be as accurate as possible. The concentration of the acid will always have a margin of difference because this is what we are investigating but we will use the same bottle of acid each time and also use 20cm3 quantities. ...read more.

Middle

As soon as you have put the rubber tube on the test tube, your partner should have started the timer and if not be waiting until an agreed measurement to set it off. Now you can measure where the gas syringe gets to every 5, 10, or 15 seconds until it reaches the end or another agreed measurement. Then repeat this experiment 2 - 3 times. Put your results into a table and work out the average of the results. If you were trying to do this more accurately increase the number of time you repeat the experiment. You can then change the measurements of the reactants and see what happens. Experiment one should look like this For method 2 you need a reasonable amount of space, a test tube, with test tube rack (if needed), a tray filled with water, a gas collector, (carefully placed in the tray of water), a rubber tube, going from the gas collector out of the tray to the test tube. Fill the test tube with 2 grams of marble chips, and get a beaker of hydrochloric acid, 20cm3. Add both of the reactants to the test tube, and put the rubber tube on the top of the test tube so that it is air tight. It should look as shown below. I would measure how long it takes for the gas collector to fill up all the way. You can tell when this happens because the water starts to get lower inside the gas collector. ...read more.

Conclusion

I can see this because of the gradient of the line. Also the higher amount of concentration the more molecules that can react with the marble chips. This may be due to the "collision theory" where the hydrochloric acid molecules are hitting less marble chips because there is a smaller amount of hydrochloric acid and a bigger amount of water. The procedure If I were to do this again I would use the same equipment every time, and probably give myself more time to do the experiments, and do more of them, to a higher standard. The reliability of the evidence The reliability of the evidence is quite high because of the fact that we didn't make it too complicated; we did have a very low range and not very many repeats. We used fairly simple recording methods. We used the acid from the same bottle so that it was always the same concentration unless we personally changed for the experiment. The fact that also there are only three outliers is a very low error rate, as I have done more than 30 readings. The reliability of the conclusion The conclusion is quite reliable because of the fact that we did do many experiments to make it fair, we firstly tried medium sized chips to see if they where appropriate to use, then we tested the big marble chips, these took a lot of time to record the results, and small chips reacted to fast to record the results, so we had no time to do it in. This is quite a reasonable method to test reactants. ?? ?? ?? ?? Page 1 of 8 ...read more.

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Here's what a teacher thought of this essay

3 star(s)

This report describes two good ways of measuring the rate of a reaction. It collects reliable results and draws good graphs. It is, however, written very poorly, with lots of grammatical as well as technical errors.

Overall, this piece of work is 3 stars out of 5

Marked by teacher Brady Smith 01/12/2012

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