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Experiment to show the presence of water of crystallization in a salt. 1).
Dry crystals of copper sulphate in the test-tube are heated. The colour of poly
crystals before heating is dark blue. When they are heated, the dark blue col fu
fades and the crystals turn white. At the same time, a colourless liquid is colles
in the water-cooled tube. If the boiling-point and freezing-point of this liquid y
measured, they are found to be the same as for water. If water is added to the s
dry white copper sulphate crystals, they turn blue and much heat is produced. 1
shows that blue copper sulphate crystals contain water, which is removed wheer
crystals are heated.
1) Describe the apparatus used in this experiment.
2) What is the colour of the crystals before heating?
3) What happens when they are heated?
4) What tests are carried out with the liquid which is collected?
5) What do the tests show?
6) What can be done to the cold dry white copper sulphate crystals?
7). What happens when this is done?
10​

Once, my mother told me that there is no such thing as frost, and I was upset.On New Year's Eve, I did not write a letter, decorate the Christmas tree, or even prepare treats.My mother realized that she shouldn't have told her this and was upset herself.

But she remembered that last year, her daughter forgot to send a letter and then her mother decided that she could read it, and then send it to the post office.

Mom did just that.It turned out that the letter came directly to Santa Claus, he understood everything and came to me the same day.I could not believe my eyes, because the living Santa Claus was at my house.He gave me exactly what I wanted.

After New Year's Eve, I went to my mother and said that I believe in miracles and will always believe in them.My mother smiled at me and said, " I must believe in them!"

I would to tell you about my last visit to a wonderful concert. I am not a big fan of classical music and have never been to musical theater. But my current friend is a pianist. Music is his life and his hobby, his studies and his work. He invited me to a piano concert last Saturday night. I didn't want to leave, but I didn't want to hurt him either. And so we went to the theater. I had a great experience. It was such beautiful gentle music, beautiful hall, beautiful interior, my loving friend ... There were unforgettable exciting moments. I was pleasantly surprised by the magnificence of the musical sounds and the beauty that surrounded us. The concert lasted over two hours, but they flew by very quickly. There were few spectators. Maybe everyone thinks that classical music is boring and just a waste of time. But I wouldn't say that. Next time I have no doubt and will definitely go to such a concert.

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