Conversations on Chemistry Volume 1; First Steps in Chemistry
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Conversations on Chemistry Volume 1; First Steps in Chemistry

Conversations on Chemistry Volume 1; First Steps in Chemistry


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: P. But how are we going to get the sugar? M. We shall get that to-morrow. I pour the water that has run through the filter into a flat china dish, or a plate, and place it on the warm stove. P. Why? M. What does water do when you put it on a warm stove ? P. It dries up. M. Yes, it evaporates, it changes into water vapour, which disappears in the air, and nothing is left in the dish. Does sugar do that, too? Does it become less when it is on a warm stove? P. No, it stays there till some one eats it up. M. Quite right. If I put my water which contains the sugar in a warm place, the water will evaporate, but the sugar will stay behind, and when all the water is evaporated, only the sugar remains in the dish. In this way we shall at last have completely separated our mixture of sugar and sand. P. I wonder what the sugar will look like to-morrow. At present you can't see it a bit, for the water is quite clear, and to-morrow it ought to be there still. 4. SOLUTIONS. P. Is the sugar there? M. Here is the dish. Look at it. P. Yes, I can see a white heap that looks like sugar. There is still some wet, though. M. That is the rest of the water which remains with the sugar, and only goes away slowly. A great deal of sugar is dissolved there, and the fluid is much less mobilethan pure water, and the water takes far longer to evaporate. P. But it hasn't come out in powder as we put it in. M. No, it has appeared in the form of crystals. The crystals in the dish are not large, neither distinct nor beautiful. But I have another sort of sugar here; do you know it ? P. Yes, it is sugar candy. M. Quite right; this kind of sugar candy is generally made this way. You dissolve it in warm water and let it slowly separate out or crystallize. Only look car...


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Product Details
  • ISBN-13: 9780217823319
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 66
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 0217823319
  • Publisher Date: 11 Feb 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 136 gr

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