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The floating compass

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The Floating Compass: A Study of Density Sarah Halstead Sec: 3 FCA's: 1. Statement of Problem (highlighted) - 20pts 2. Two data tables with correct data - 25pts each 3. List three you learned about density - 30pts (Use self-editing; underline and numbered) Statement of the Problem: We were trying to build a density jar with four visible liquid layers, with objects in three of those layers. At the beginning of the lab, I thought that it would be easy to find four stackable liquids, I was wrong. Before we started the lab we did a lot of other labs dealing with density, such as the "Liquid Rainbow", and the "Liquid Density" labs. Objective: I kept trying liquids and objects until I found four liquids, and three objects that I thought would work. Materials: 1-250 ml beaker 1 electronic balance Test tubes Droppers Liquids Objects 1 jar 1 long ruler with no holes Salt Graduated cylinders Procedure: 1. ...read more.


11. Measure the height of your jar and then divide it by four, then make little lines at the 1/4, 1/2, and 3/4 marks. 12. Put the bottom layer straight in, making sure that none of it touches the sides. 13. Using the ruler as a ramp, put your first object in the liquid. 14. Pour the next layer in by pouring it down the ruler, making sure that the tip of the ruler is always slightly above the liquid. 15. Repeat steps thirteen and fourteen for the rest of the liquids and objects. Results (Data): Liquids Liquid Mass Volume Density Isopropyl alcohol 13g 25ml .52 g/ml Rain-x 15g 25ml .6 g/ml Peanut oil 18.25g 25ml .73 g/ml Wine vinegar 20.5g 25ml .82 g/ml Objects Object Mass Volume Density Mini compass Bouncy ball 5.6g 8.18ml .69g/ml Plastic spool 1.5g 2ml .75g/ml Conclusions (3 paragraphs): My data addresses the objective of this lab because it shows that, if you calculate and ...read more.


1. I learned that liquids with different densities don't necessarily stay separate. For example, if you take some salt water and put some plain water in it, they will mix even though the salt water is more dense than the plain water. 2. I also learned that oil always floats on top of water. That is why, when there is an oil spill, they can just skim the oil off the top of the water. That is also why you are not supposed to use water on oil and grease fires, because the water will just sink down under the oil and not do any good. 3. Another thing I learned is that some things float even though they look like they should sink. For example, Submarines can float or sink, depending on how much water they take in, if they were full of water they would sink because metal is heavier than water, yet, if it has air in it, it will float because air is lighter than water. ...read more.

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