Сборник задач по подготовке учащихся к международным исследованиям timss и pisa
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Task 12. Salt Salt! Is civilized people thinking without it their meal? And they have it without difficulty, and it costs a penny. It is perhaps the only mineral that we eat in its natural form, crushing it to the desired state. Salty cabbage, cucumbers, salted and dried fish - salt is everywhere, so accessible and natural. Chemists call sodium salt, a necessary ingredient of food . Figure 14 Question 1. When in Ireland there was a painful punishment: prisoners received only bread and water without any salt. After a while these people died, and their bodies began to decompose immediately ... And the inhabitants of some island states to satisfy the need for this matter, were eating raw fish, dipping it in salt water. What is this substance? A. H2O B. NaCl 158 C. NaI D. Na2CO3 Answer: ______________. Question 2: How can sodium salt be cleaned, polluted by the river sand? A Salt solution may be cleaned from sand by evaporation yes / no B. The salt solution can be separated from the sand filtration yes / no C. The salt solution from the sand may be cleaned with cold water Yes / No Answer: ______________. Question 3: S------ SО 2 ----- H 2 SO 3 Na---- Х ----- NaОН Answer: ______________. Tasks 13 . The electromagnetic waves. The huge territory of Kazakhstan also contributes to the development of satellite TV - Television Without Borders. A great help in this direction is the Kazakhstan cosmodrome "Baikonur" - Centre for the launch of space rockets. Thanks to the satellite TV system "Zharyk" has become possible to transmit television programs of Astana and Almaty, in all regions of Kazakhstan, as well as to cover the peripheral portion of broadcasting Russia, Uzbekistan, China, and Mongolia. Kazakh satellite «KazSat-1», «KazSat-2», «KazSat-3" satellite communications provide the republic, as well as the digital TV and radio broadcasting. The spacecraft «KazSat-3" was placed in an intermediate orbit in April 2014 and is intended to provide telecommunication services, television and high speed Internet access on the territory of Kazakhstan and neighboring countries. With the development of technology equipment communications is developed. For example, a simple telephone is replaced by digital telecommunications systems having tremendous functionality. Figure 15 Question. Try to explain the impact of the development of means of communication on the human life activity? Answer: ______________. жүктеу/скачать 3,47 Mb. Достарыңызбен бөлісу:
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