The Teaching of Chemistry And Physics in the Secondary School

Cover The Teaching of Chemistry And Physics in the Secondary School
The Teaching of Chemistry And Physics in the Secondary School
Smith Alexander
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Some Misleading Words : One of the most fruitful sources of misconception lies in the ordinary phraseology of strong' chemistry. Thus the word strong is very much Acids. Overworked. It is used for active in reference to the chemical tendencies of oxygen, chlorine, certain acids, and so forth. It is used in connection with solutions when great concentration is meant. It is even used for stable. It will be found most satisfactory to use the proper one of these three terms in the classroom and to ...exclude the word strong altogether.
The words stable and, the converse, unstable are used in two ways. Thus sodium chloride and nitrogen iodide are respec- ' stable' tively styled stable and unstable, in consequence of Bodies. Their behaviour when heated, and properly so.
Phosphorus trichloride is exceedingly stable by this test, but is often spoken of as unstable because moist air decomposes it. In this sense everything might be considered unstable, since everything undergoes change when treated with a suitable chem- ical agent.


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