Сборник задач по подготовке учащихся к международным исследованиям timss и pisa
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Task 12. Salt Salt! Is civilized people think without his meal? And extract it without difficulty, and it costs a penny. Only, perhaps, a mineral that we eat in its natural form, except that the ground to the desired state. Sauerkraut, pickles, salted and dried fish - salt is everywhere, so accessible and regular. Chemists call table salt - a necessary component of food. Figure 14 Question 1. When in Ireland there was a painful punishment: prisoners received only bread and water without the addition of this substance. 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, eating raw fish, dipping it in salt water. What is this stuff? A. H2O B. NaCl C. NaI D. Na2CO3 157 Answer: ______________. Question 2: How can I clear the table salt, polluted river sand? A Salt solution may be cleaned from sand 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 improved technology equipment communications. For example, to replace a simple telephone come digital telecommunications systems have tremendous functionality. Figure 15 Question. Try to explain the impact of the development of means of communication and human life activity? Answer: ______________. жүктеу/скачать 3,45 Mb. Достарыңызбен бөлісу:
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