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# What makes an oil runny?

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Introduction

Chemistry Investigation

Title: - What makes an oil runny?

Plan

I am going to investigate what properties make oil runny and also the viscosity of oils.

There are a number of variables that could influence my test some of which include,

• The temperature
• Length of slope
• Amount of hydrocarbons present
• Amount of oil on the slide

I am going to test the amount of hydrocarbons in the oil. I am testing this because the other four variables would be to hard to control, such as the temperature and if I were to test the gradient I would have to measure the exact degree and have a reliable stand or propping device  to hold it. Therefore the amount of hydrocarbons is the simplest because I just use a different oil each time.

I predict that the lower number of hydrocarbons present, the faster the oil will reach the bottom of the slide. I think this because if you

Middle For the measurements I will use seconds and milliseconds and minutes if necessary. All answers will be to 2d.p and I will do each run three times.

The method is a straight forward one. I will find a solid structure that is of satisfactory height and then carefully position my slide against it making sure not to break the slide☹. Then I will drop an amount of oil onto the slide and when it reaches the start line I will begin to time. Then when it reaches the bottom I will stop timing and proceed to record the results in a table. Then I will repeat this test two more times and after that move onto another of the oils.

I have performed a pre-test with only one oil to get a wide range of results and they are as follows: On paper

I have performed the pre-test so that I can

Conclusion

If I obtained a separate set of results I could plot them against each other and get a contrast of the two sets.

Analysing Results

Graph on separate sheet

My graph shows that as the time of the oil is slower then the average speed decreases so it is slower. My graph slows a negative correlation when the speed is on the vertical axis and the time is on the horizontal axis.

My results support my prediction as I predicted that the longer the chain of hydro carbons was then the longer time it would take to reach the bottom of the slope.

Evaluating Results

I think that my results are quite accurate as we have compared with other groups and our results are similar.

There are no anomalous results on the graph.

My results are reliable because if another word for reliability is repeatability and we repeated them three times and they were always about the same value.

The procedure was simple but effective, the slide was a good length and we found our own angle at which to set it.

This student written piece of work is one of many that can be found in our GCSE Forces and Motion section.

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