Titlebook: Work Out Chemistry GCSE; Alan Barker,Kathryn Knapp Textbook 1990Latest edition Kathryn Knapp and Alan Barker 1990 bonding.Confidence.energ

摘要

aptitude

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Acids, Bases and Salts,Acidity is measured on the ., a scale of numbers normally ranging from 0 to 14. A pH value of 7 is neutral, less than 7 is acidic and more than 7 is alkaline. A . gives different colours corresponding to different pH values, typical results being red for pH = 1, purple for pH = 14.

CORD

The Metals,When metals are arranged in order of decreasing chemical reactivity, the . is obtained. The chemical properties of a metal and its compounds are related to the position of the metal in the reactivity series as shown in Table 12.1.

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Postulate

Nitrogen,Nitrogen forms about 78% of the air and can be prepared from it by removing oxygen and carbon dioxide. Industrially, nitrogen is obtained by the fractional distillation of liquid air (see Section 9.2).

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Oxygen and Sulphur,Oxygen is the most abundant element in the Earth’s crust; it also forms 21 % of the atmosphere.

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Some Industrial Processes,Industrial processes are designed to manufacture products as economically as possible, taking into account both the speed and the cost of operation.

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Chemical Analysis,This section has been restricted to the detection of the following ions:., K., Na., Ca., Al., Zn., Fe., Fe., Cu., . and Cl..

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