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To Identify 5 Given Oils By Testing Their Viscosity At Different Temperatures.

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Introduction

To identify 5 given oils by testing their viscosity at different temperatures. Scientific research: We know that oil comes out of the ground is called crude oil. Crude oil was formed from the remains of tiny sea animals and plants, which died millions of years ago. It is a mixture of substances called hydrocarbons. These are compounds of hydrogen and carbon. "At an oil refinery, the different substances in crude oil are separated in a fractionating tower. The oil is boiled so that most rises up the tower as vapour (gas). As it rises, it cools different substances condense (turn to liquid) at different temperatures, and are collected at different levels. The different parts of mixture are called fractions. Separating fractions by boiling is called fractional distillation. Heavier Fractions have longer molecules than lighter fractions. Using a chemical process called cracking, long molecules can be broken up to make shorter ores. So, if there is too much diesel oil, It can be changed into petrol by cracking. Short molecules can also be joined together to make longer ones. This process is called polymerisation." (Source 1) Cracking Hydrocarbons with large molecules have higher boiling points than those with smaller molecules. They also burn less easily. To get more useful fuel, a large hydrocarbon molecule can be cracked by heating with steam or a catalyst. Two smaller molecules are formed. ...read more.

Middle

* Take temperature of oil and record it as the heading of the table. * Collect a class slide and place it horizontally on the table. * Measure 0.5 cm from the edge of the slide. * Use a dark coloured felt-tip to draw a vertical line on the edge of the slide. * Repeat the process for the other edge of the slide. * Draw on a piece of paper were you are going to place the rubber bung and the slide. * Place slide in the same position each time. * Use a pipette to drop 2 drops of the oil required before the marked line on the slide. * Start timing as soon as the oil crosses the first marked line on the slide. * Stop timing as soon as the oil reaches the marked line at the bottom of the slide. * Record the result in the table. * Take a piece of kitchen towel and pour some washing up liquid on the towel. * Use the paper towel containing washing up liquid to wipe all grease of the slide. * Repeat this process 4 times using just one type of oil. * After doing so repeat process for al 5 oils. * Draw table with six columns * Name the columns; oil types, time taken 1, time taken 2, time taken 3, time taken 4 and average. ...read more.

Conclusion

* Measure 0.5 cm from the edge of the slide. * Draw on a piece of paper was you are going to place the rubber bung and the slide. * Place slide in the same position each time. * Use a dark coloured felt-tip to draw a vertical line on the edge of the slide. * Repeat the process for the other edge of the slide. * Use a pipette to drop 2 drops of the oil required before the marked line on the slide. * Start timing as soon as the oil crosses the first marked line on the slide. * Stop timing as soon as the oil reaches the marked line at the bottom of the slide. * Record the result in the table. * Take a piece of kitchen towel and pour some washing up liquid on the towel. * Use the paper towel containing washing up liquid to wipe all grease of the slide. * Repeat this process 4 times using just one type of oil. * After doing so repeat process for al 5 oils. Fairest: in order to keep it a fairest I need to keep: * The angle of the slide the same. I will do this by drawing on a piece of paper were I am going to place the rubber bung and the slide. By doing so I can also place my slide in the same position each time. * Repeat the experiment 4 times so that I can get a more accurate measurement. * Take the temperature of oil. * * * * ...read more.

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