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Next: Useful data Up: Back to the Chemistry 2000 test index Chemistry 2000, Fall 96, Test 2 There are six questions. 1. Starch is a glucose polymer, i.e. a very large molecule made by stringing many glucose molecules together. The osmotic pressure of a starch solution is measured over a period of weeks. Between measurements, the solution is kept in a sealed container so that little evaporation takes place. It is observed that the osmotic pressure rises over time. Give a chemical interpretation of this phenomenon. [5 marks] 1. Why can salt be used to melt ice? [3 marks] 2. Ethanol is used as a deicing agent for airplane wings and in other applications where a solid deicing agent would be inconvenient. However, it is never used on roads. Can you suggest a reason why? Hint: One of your senses can be used to alert you to the presence of ethanol. [2 marks] 2. What is the vapour pressure of a solution made by dissolving 250g of sodium sulfite ( , molar mass 126.04g/mol) in 1.50L of water at 298K? The vapour pressure of pure water at this
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test2 - Next: Useful data Up: Back to the Chemistry 2000...

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