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By H. Messel

ISBN-10: 0080121535

ISBN-13: 9780080121536

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Additional info for Abridged Science for High School Students. The Nuclear Research Foundation School Certificate Integrated, Volume 2

Sample text

For instance, we found that a charged plastic rod held its charge in dry air. If there is, however, a sufficiently large voltage involved, gases will behave as conductors as does the air during a flash of lightning. If the pressure of a gas in a container is low, the gas is a better conductor than it is at higher pressures. The neon gas in neon signs, for instance, is under a low pressure-about half an atmosphere-and acts as a conductor. This matter will be discussed in some detail in Chapter 36.

Exothermic changes are used to supply energy. For instance, the combustion of a fuel is an exothermic reaction and the exothermic reactions involved in respiration s upply us with the energy required to keep us warm and do the many things we do. At constant temperature, energy must be supplied to produce endothermic changes. For instance, the evaporation of water, which is an endothermic change, keeps our bodies cool ; many of the processes which are used to supply us with useful materials such as iron, copper and chlorine are endothermic-some of these changes are di scussed in Chapter 44.

2. What properties are associated with molecular compounds ? 3. What properties are associated with 10mc compounds ? 4. N ame four conductors and four conductors not mentioned in this chapter. non­ 5. A white solid substance did not conduct electricity when melted but a I O per cent sol ution of it did. What kind of particles did it contain i n the liquid state and in solution ? Give your reasons. 6. Was the substance in Question 5 a salt ? Could you suggest what other class of substance it might be ?

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Abridged Science for High School Students. The Nuclear Research Foundation School Certificate Integrated, Volume 2 by H. Messel

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