Yeah, I'm just confused because our science fair says I'm supposed to include all the parts like abstract and variables. I think I can put the background stuff in lists. I can make a list of four characteristics that affect deicers (freezing point depression, effective eutectic melting temperature, hygroscopic, exothermic) and then make other lists under each chemical for there characteristics (calcium chloride = 3 ions(particles), melting temp -29C, is hygroscopic and is exothermic). I took picturs of each of my chemicals under a micrscope and those will make cool headings.
Ok so whle I'm asking questions, I hate my results section. If I were a judge I would like reading it, but it says I'm supposed to tell what the numbers say. This is what I have..
In this experiment, the independent variable that was changed was the type of chloride compound used and the dependent variable was the amount of ice melt measured in milliliters. The types of chloride compounds used were sodium chloride, magnesium chloride, potassium chloride and calcium chloride. The average amount of melt at 0oC for each chloride compound was sodium chloride 8.3 ml, magnesium chloride 19.2 ml, potassium chloride 7.8 ml and calcium chloride 32.2 ml. (See Table 1) The average amount of melt at -6oC was sodium chloride 3.6 ml, magnesium chloride 16.2 ml, potassium chloride 3.8 ml and calcium chloride 25.2 ml. (See Table 2) The average amount of melt at -18oC was sodium chloride 1.1 ml, magnesium chloride 15.7 ml, potassium chloride 1.1ml and calcium chloride 25.2 ml. (See Table 3)
Across all three temperature sets, calcium chloride and magnesium chloride created more melt than sodium chloride and potassium chloride. Both are exothermic and are made up of three atoms, but sodium chloride and potassium chloride are not exothermic and are made up of only two atoms. Also, both clacium chloride and magnesium chloride had lower eutectic melting temperatures than sodium chloride and potassium chloride.
Got any suggestions?
If it helps this is what I have for a conclusion..
The hypothesis tested was that if sodium chloride, magnesium chloride, potassium chloride and calcium chloride are applied to ice at temperatures of 0°C, -6°C and -18°C, then calcium chloride will on average melt ice the fastest at each temperature.
It was found that although the amount of melt decreased as the temperature decreased for all the chloride compounds, in all three temperature sets calcium chloride on average melted more ice in the twenty-minute time period than the other chloride compounds tested. (See Graph 1) Therefore, the data tends to support the hypothesis.