Year 10 MYP Chemistry
How does varying the surface area to volume ratio (2.0046: 1, 1.4923: 1, 0.9425: 1, 0.6480:1, 0.5970:1) affect the amount of heat lost over a period of 6 minutes of 50cm3 water with a temperature above 50?
b. Prediction and Hypothesis.
Make a prediction about what you expect to be the outcome. Explain your prediction using scientific ideas.
I predict that the bigger the surface area to volume ratio, the lesser the heat will be lost. And the smaller the surface area to volume ratio the more heat will be lost.
The surface area, volume ratio of the beaker
The temperature of the water/The amount of heat lost
The volume of water used 50cm3
The time intervals the temperature is measured over
Surface on which the experiment will be done (conduction)
The same shape of beaker
5 beakers each of a different Surface area to volume ratio •
500 cm3 Hot water
5 Lid with a hole
Table of apparatus:
Name of Apparatus
Picture of Apparatus
Use of apparatus/ Errors 1.
Beaker of different Surface area to volume ratio
2.0046: 1 1.4923: 1
This will be used to store the water and heat. The errors may be that make sure the outside temperature of the beaker is the same as if a beaker was just used, the surface is still hot and hence that may affect results. 2.
This is used to take the temperature of water. However the errors may be reading errors as not reading accurately. 3.
This is going to be the water inside the beaker of which the temperature will be taken. However one error would be that the temperature of the hot water is sure to change so make sure to take the original temperature before your experiment. 4.
This will be used to keep track of time as to when the temperature should be measured. Errors of the stopwatch would be that if the stopwatch is started too late of too early may cause errors in the results. 5.
This is going to be used to heat the water to make it a temperature above 50 degrees. 6.
Lid with hole
This is going to be used to cover the beakerto stop the heat from escaping, however the error may be that it will have to be put very quickly on top of the beaker to block the heat from coming out but if its put too late then a lot of heat will have escaped.
Be careful when dealing with hot water
Watch out for leaks of mercury from the thermometer
Hold the beaker with a cloth after experiment due to heat of beaker
First gather all apparatus and lay it out as shown above
Then use the kettle to heat the water until it is hot
Start with the first beaker of the surface area to volume ratio 2.0046: 1 and pour 50cm3 into the beaker 4.
Then quickly cover the beaker with the lid with a hole and insert the thermometer 5.
Measure the original temperature before the heat has time to escape and start the stopwatch 6.
Then after an interval of 2 minutes, 4 minutes and 6 minutes, use the thermometer to measure the temperature 7.
Then subtract the temperature of the water after 6 minutes and original temperature to get the total amount of heat lost 8.
Then repeat steps 2-7 for a second trial
After results from try 1 and try 2 are gotten, record it in a table like this: Surface area to volume ratio of beaker
Original temperature of water
After 2 minutes
After 4 minutes
After 6 minutes
Total amount of heat lost
Try 2 2.0046: 1
Then repeat steps 2-9 only this time changing the size of the beaker in step 3 to the beakers with the surface area to volume ratio 11.
Once all result a collected for each independent...
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