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. Get all of your materials
2. Place the beaker on the balance and press "on" or "reset"
3. Put 25ml of water in the beaker and put it back on the balance
4. Make a chart to record the data and then do so.
5. Find the density by dividing mass by volume, however far off from 1.00g/ml it is, is how much of an error the balance can have.
6. Repeat steps three though five for the rest of your liquids.
7. Put together test tubes based on the densities of your liquids. Starting with two layers at a time.
8. Repeat step seven until you have four stack-able, distinguishable, see-through liquids.
9. Find the density of your objects by using wet or dry displacement for the volume, and the electronic balance for the mass.
10. Repeat step nine until you have three objects, each of which will float in a different layer.
11. Measure the height of your jar and then divide it by four, then make little lines at the ¼, ½, and ¾ 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
Objects
Conclusions (3 paragraphs):
My data addresses the objective of this lab because it shows that, if you calculate and measure everything correctly then you should be able to predict where each layer and object will end up being when it is all put together in a jar. If you don’t calculate correctly, then you could end up with something that is crazy, like having your densities say that some veggie oil, for example, is heavier than corn syrup, which is completely wrong.
We could have made errors in collecting data because we were using beakers instead of graduated cylinders, and they are less precise. They are less precise because they only measure by 10ml at the least, and graduated cylinders measure down to .2ml per line. Another error that could have been made was that no balance is perfect, so your results will not be perfect, also human beings are not perfect, so it is impossible to get exact results. So, even if your balance were perfect, your data would still not be completely perfect.
- 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.
- 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.
- 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.