| Chemistry science fair projects have changed over | | | | 0 C (this will take some time to do!) and put all 10 |
| the years; they've gotten a lot glitzier and much more | | | | glasses in the freezer. Wait for about an hour, and |
| technically involved. While this is has made it | | | | write down which glass has frozen. Now, adjust the |
| somewhat easier for parents, the modern trend in | | | | temperature of the freezer down by 1 degree C, and |
| science fair projects tends to be to buy a science fair | | | | observe in half an hour. Have any of the previously |
| kit off the internet rather than make things yourself. | | | | unfrozen glasses frozen? |
| We're going to cover old school style chemistry | | | | Keep repeating, dropping the temperature each time |
| science fair projects that will set you apart. | | | | until you get to -15 C; is there a correlation between |
| First, there's something to be said for the "do it | | | | the amount of salt in the water and the temperature? |
| yourself" method of doing science fair projects. A lot | | | | What does this imply about oceans and how they |
| of really good scientific learning can be done with this, | | | | freeze in the Arctic? |
| and the hands-on experience is excellent for | | | | If you take some of the ice out of the frozen glasses, |
| associating science with the real world, particularly with | | | | is it salty, or fresh? Why? |
| chemistry. | | | | Take careful notes of your observations and work out |
| Some good hands-on chemistry science experiments: | | | | a theory for your chemistry science fair project. |
| Salinity and Freezing temperatures | | | | This chemistry science fair project will teach you how |
| Take a liter of water, carefully measure it out into ten | | | | to do proper methodologies for recording science |
| glasses of 100 cc each, and add salt to each of the | | | | experiments, and for tracking your data. |
| four glasses. Put no salt in the first glass, 10 grabs | | | | It should also give some non-linear results - the amount |
| (about half a teaspoon) into second, and keep adding | | | | of salt dissolved in the water won't linearly change the |
| half a teaspoon to each subsequent glass, until the last | | | | amount of temperature needed to freeze the water, |
| glass has 4.5 teaspoons. Stir carefully, until the salt all | | | | because the solution gets saturated. |
| dissolves. | | | | Building a graph, and explaining your results is another |
| Now, adjust your family's freezer so that it's at exactly | | | | valuable skill you'll learn from this. |