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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?
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Name:Naurzum Nature Reserve
Location:The Naurzum nature Reserve is located on the territory of the Naurzum and Semiozersky districts of Kostanay region, 190 km south of Kostanay.
Animals:In the zonal steppes, the most typical are the field and white-winged lark, black lark, field horse, common kamenka, strepet, steppe harrier, gyrfalcon, belladonna crane, and steppe eagle. The forest areas are inhabited by black grouse, great spotted woodpecker, oriole, wood pigeon, common turtle dove, great tit, white azure, common redstart, forest horse, black swift and others.
Plants:The flora contains elements of both northern boreal and southern flora. Among the ancient elements of the marsh-forest flora found: telipteris marsh, nettle dioecious, common hops, nightshade bittersweet; boreal species, rare for Northern Kazakhstan: winter horsetail, two-stamen sedge, slender fluff, marsh belozor.
1.When was Mrs Smith very
busy ?
Mrs Smith was very
busy two weeks before Christmas.
2.What did she do ?
She bought a lot of Christmas cards.
3.Why did she buy the cards ?
To send to her friends and to her husband's friends.
4.Where did she put them ?
She put them on the table in the living-room.
5.What did she say to her
husband ?
She said to her husband to write the cards while she was cooking the dinner.
6.What did Mr Smith say ?
Mr Smith did not say anything.
7.What did he do ?
He went to his study.
8.How did Mrs Smith feel ?
Mrs Smith was very angry with him.
9.What did she say ?
She did not say anything either.
10.What did Mr Smith do a
minute later ?
He came back with a box full of Christmas cards.
11.What did he say ?
He said that those were from last year he had forgot to post them.