Safety
To make sure this experiment is safe I will wear safety goggles to protect my eyes, and try to be very careful when burning the crisps.
Fair Test
To ensure this experiment is a fair I will keep the amount of water the same throughout the experiment also hold the crisp in the same position each time, I will change the water beaker every time I burn a crisp there by keeping the starting temperature of the water the same for every crisp I burn, I will burn each crisp until it burns itself out and I will perform each experiment three times and take an average to make the experiment fair.
Apparatus
For this experiment I used
Tongs, Safety Goggles, Test Tube, Bunsen burner, Safety mat, Measuring cylinder, Thermometer, Clamp stand, Clamp.
Table
I feel that the experiment went very well and I am sure that the recorded results are accurate, because I repeated burning each crisp three times.
Scientific Knowledge
.1calories raises the temperature of 1cm of water by 1 C
. Calories = volume of water x temperature difference.
.1calories = 4.2 J
Method
1) I will collect all the apparatus and set
2) I will measure the crisps weight in grams and record it.
3) I will measure out 10ml of water and then record the temperature of it.
4) I will light the Bunsen burner.
5) I will burn the crisp under the test tube until it has completely burned itself out.
6) I will then take the temperature of the water.
7) I will repeat this method three times for each crisp, and then take an average.
Conclusion
My prediction was not correct although I was wrong I did expect that size difference in temperature between the two types of crisps. I found that from my results table that Michael is wrong because on average the low fat crisps give off more energy that the high fat crisps when they burned, so the low fats must have more energy in them than original.
I found that from the crisps that I tested the crisp with the most energy was Cheese + Onion light with a temperature increase of 52.7 c. so I think that if Michael want to watch what he eats he should have cheese + onion, this is because they are the best crisps because he wants lots of energy for the activity that he does in school and it should fill him up well because it contains high levels of energy for crisps, there is not much fat so he won’t put on weight during his diet.
So in short I feel these are the best crisps for Michael to eat because according to my investigation results these have the highest amount of energy in them and are low fat crisps, perfect for what Michael’s body needs while he is on his diet.
Evaluation
If I were to repeat this experiment would use equal amounts of low fat and regular crisps because I found that the crisps I used were not really low and high fat crisps they were Salt + Vinegar, Barbecue and Cheese + Onion when what I should have used was different brands off low fat and original crisps. Also I would of used a smaller amount of water to see if that would of made a difference to the accuracy of the temperature change because I feel that this would have made the temperature reading more accurate when heating.
I got only two odd result during the experiment and this was while I was testing Salt + Vinegar and Original light, but I think that these did not affect the end average much and did not really change my results because there were not very big gaps between them and the averages, but all in all these were good measurement and mostly apart for these two result very accurate. I feel that this was a very successful experiment and I think that it went very well, I got good result and was pleased with the way it went and I was able to answer Michaels question well and give a very accurate answer, so I am happy with this experiment.
Julian Kiley 10I