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Investigating how changing the temperature affects the rate of evaporation

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Introduction

Science Investigation Planning Sheet 1 2 3 4 S&G Name: Abdul Rahman Form: 11S Group: 11Y1 Title of Investigation: Investigating how changing the temperature affects the rate of evaporation Description of the Investigation: We are going to investigate how changing the temperature affects the rate of evaporation of 0.5cm� of liquid acetone. We will place the acetone on a watch glass, over a beaker of 250ml of water. We will heat the water to the temperature required and then put the watch glass over the beaker when required. Then we will time how long it takes for the Acetone to fully evaporate 1. Planning: Factors that could be changed: The factors that could be changed, that are relevant to this investigation are * The volume of Acetone * The volume of water * The stop-clock starting point * The temperature of the water In my investigation I will: Change Keep the same The temperature of water The volume of Acetone The volume of water The stop-clock starting point Prediction From my prior scientific knowledge, I will make the prediction that, as the temperature of the Acetone gets higher, the time it takes to evaporate will get less. I will make a very precise prediction that, as the temperature doubles, the time taken for the Acetone to evaporate will half. ...read more.

Middle

First of all, I will do my experiment at room temperature. I will put the watch glass over a beaker of 250ml of water at room temperature, without any heating. I will put the Acetone on the watch glass using the pipette. I will ensure that I have the correct amount of Acetone on the watch glass. I will time how long it takes for 0.5cm� of acetone to completely evaporate. I will repeat each experiment three times to get a god set of results to draw conclusions from. I will repeat these steps for the other four temperatures. Throughout this experiment, I made sure that safety was one of my top priorities. I wore goggles at all times to protect my eyes; I used safety mats. These told me the dangerous capabilities of chemicals that were to be using and what safety measures were needed when using these chemicals. I used a heatproof mat and tripod when using the Bunsen burner and took extreme caution when turning it on and off. I took the same extreme caution when I repeated the results, which I will talk about later on. 2. Obtaining Evidence Temperature (�C) Time (S) Average Time (S) 1 2 3 21 384 340 301 343 31 282 297 286 286 41 142 164 161 196 51 121 126 132 129 61 100 105 103 102 3. ...read more.

Conclusion

I have found some anamolies within my results that have affected the overall conclusion. One of my results, the experiment at 41�C, does not seem to fit the pattern, as it should. This is probably due to the fact that on the day that I conducted this investigation, there was a mild wind blowing and one of the windows was left open and a breeze from the window could have caused the Acetone to evaporate more quickly than expected. If I was to do this experiment again I would take great care in ensuring the environmental distractions are taken care of i.e. doors and windows closed. Some other areas in the experiment that I feel I could have improved on were factors like controlling the stopwatch and measuring the amount of Acetone and Water. There is lots of room for human error here. However the inaccuracies due to them were negligible because I paid close attention to these during the experiment. Overall, this investigation has been a successful one. I feel my results and analysis have been as accurate and reliable as they could have been under the time allocated. However I feel with extra time, I could have repeated the experiment and made it even more accurate. I could do this by, instead of repeating the experiment every 10�C, I could repeat the experiment more often e.g. every 5�C ...read more.

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