Сборник задач по подготовке учащихся к международным исследованиям timss и pisa
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ПИЗА ДАЙЫНДЫ0 ТАПСЫРМАЛАРЫ қазақша
- Бұл бет үшін навигация:
- Task 2.
- Task 3. Burning
Scientific literacyTask 1. Normal human body temperature is 36.6 ° C and it is not cold, if the air temperature is 25 ° C. The water is at a temperature of 25 ° C, cool man. Question. Why at the same temperature of 25 ° C in cool water person rather than cold air? Choose the correct answer. The thermal conductivity of water is much greater thermal conductivity of air. In the air, at a temperature of 25 ° C, creates a complete thermodynamic equilibrium of the body and the environment. The heat transfer rate of the organism in water than in air. Task 2.Given the homogeneous metal ring. Question. How does the internal diameter of the homogeneous metal ring when it is heated? When heating rings all its linear dimensions increase, so increases the thickness of the ring and its internal diameter decreases. Upon heating rings all its linear dimensions are increased in the same respect, so it turns out the ring is geometrically similar to the original. The inner diameter of the ring, thus, increases. When heating rings all its linear dimensions, including thickness of the ring increases proportionally, so its internal diameter is not changed. Task 3. BurningDulat on a piece of paper with a concentrated solution of potassium nitrate (KNO3) one continuous line contour outlines, for example, a circle. From the circuit pattern with the same solution to the edge of the paper carried a line at the end of which put a pencil point. When the drawing is dry on the paper you will not see anything but a pencil point. If you touch a point smoldering splinter paper begins to burn slowly for drawing contour lines. The light, moving around the contour outline the square. Question. Explain why the paper is burned? http://bbsv.ru/education/chemistry/blast-flash.htm Figure 1 жүктеу/скачать 3,11 Mb. Достарыңызбен бөлісу:
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