I think what would be best would be to do an experiment to investigate which of the following slows down the freezing of water best - sugar, salt or vinegar.
Just discovered this site - http://www.picotech.com/experiments/freezingofwater/freezingofwater.html.
It gives an example of an experiment used to test the freezing of salt water compared to the freezing of pure water.
The problems with the experiment on the website are:
1. The equipment listed is very complicated/unattainable - e.g. "DrDAQ DataLogger". BUT wouldn't a thermometer do the same thing?
2. Because of changing the equipment the experiment would be more confusing/difficult.
The other thing to consider would be how often to measure the temperature. Measuring would also have to be done very quickly in order for the results to not be affected by the room temperature.
Experiment Method I would use if I conducted this experiment:
1. Fill 4 plastic cups with plain tap water, water with sugar mixed in, water with salt mixed in and water with some vinegar in it.
2. Place each cup in the same freezer.
3. Measure the temperature of the solutions at specified intervals.
4. Record results.
5. Repeat experiment several times.
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Jacinta, looking very good so far- needs a LITTLE bit of tweeking to make it better though... rather than looking at the different TYPES of substances which change the freezing point, perhaps look at how MUCH of the substance will affect the freezing point? Eg... look at sugar and go 1g of sugar, 2 g of sugar, etc...
ReplyDeleteTry not to do salt as someone else is doing it- if you have time you can compare all 4 substances.
But you are approved to do the project!