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How does the temperature affect the viscosity of glycerol?

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By Rachel Boyes How does the temperature affect the viscosity of glycerol? Aim The aim of this experiment is to see how the temperature affects the time it takes for the glycerol to be completely poured into a conicle flask. Prediction I predict that the hotter the glycerol (heated by a Bunsen burner), the more rapidly it will run, and won't therefore take as long as it would to be poured completely into a conicle flask at room temperature. Science When the molecules are heated, they vibrate strongly. The molecules in the hot glycerol are moving faster and colliding with one another, spreading them farther apart, so that this glycerol is less dense. Making it easier for the molecules to move about. The particles that make up all matter are always in motion, but when heat energy is added they move much faster and bump into each other more often and with greater force. ...read more.


� Keep floor and work space neat, clean, and dry. � Clean up spills immediately. � Do not taste any substances tested unless expressly permitted to do so by a science teacher in charge. USE EQUIPMENT WITH CARE � Set up apparatus far from the edge of the desk. � Push Bunsen burner tube carefully onto a gas releaser. � Clean glassware before and after use. � Check glassware for scratches, cracks, and sharp edges. � Clean up broken glassware immediately. Apparatus * Gauze * Tripod * Bunsen burner * Boss and clamp * Retort stand * Bench mat * Stopwatch * Conical flask * Funnel * Thermometer * Beaker Method To begin the experiment, firstly I gathered the required apparatus (as shown above) and arranged it as necessary. Followed by the glycerol being measured into the required amounts needed, the temperature was then recorded, as a starter. It was then poured through the funnel, and the stop watch was immediately started, the time was then recorded, after the glycerol had been completely poured into the conical flask. ...read more.


Evaluation Overall, the experiment was successful as it reached its target, I have now got the precise information to qualify my prediction. Although it was correct it could have been improved in many ways i.e. making sure no glycerol was wasted whilst pouring it back into the beaker, as it needed to be used again. There was excess glycerol kept inside the conical flask, this could have been avoided by cleaning it out for every temperature, even if it meant using more and more glycerol each time, as it would have been more accurate. The stopwatch was not started exactly at the right time, either because the person who started it did not have quick enough reactions, or it was in fact the stop watch that was not very accurate. This could be avoided by linking the experiment to the computer, which can give extremely accurate results and a better overall idea on how temperature affects the viscosity of glycerol. ...read more.

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