How to Determine if a Substance is Pure

A pure substance consists of only one type of substance not mixed with others. In contrast, a mixture is a substance which has two or more different substances mixed together (not chemically combined). In this chapter, we would look into how to differentiate if a substance is pure (or is it a mixture). Determining if …

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Collection of Gases and Measurement of their Volumes

Gases may sometimes be produced during chemical reactions. By collecting and measuring the volumes of gas produced, we can know more about the reaction which had taken place and may also use it as a reactant for another reaction. The method used to collect a particular gas is dependent on its: Solubility – its ability …

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Measurements of Time, Temperature, Mass and Volume

All scientists measure time, temperature, mass and volume differently. However, in order to standardise and improve communication, the Standard International Unit (S.I. unit) is used. Measurement of Time The S.I. unit for time is second (s) Other units for measuring time include: minute (min) and hour (h) Some of the instruments used to measure time (especially in …

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Measurements in Chemistry

In this Chapter, the more commonly measured physical quantities in Chemistry experiments, how these quantities are measured and the instruments most suitable for measuring them would be introduced. Sub-topics: Measurement of Time, Temperature, Mass and Volume Collection of Gases and Measurement of their Volumes Determining if a Substance is Pure TBD TBD TBD Back to O Level Chemistry