8.1.1

Purity & Formulations

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Effects of Impurities on Melting/Boiling of a Sample

Chemically pure substances have exact and specific melting and boiling points. Adding impurities will widen the range of temperatures at which the sample melts or boils.

Formulations

Formulations are mixtures of chemicals that have been designed to create useful products.

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Each component has a role

  • In a formulation, each component helps to decide what the mixture’s overall properties are.
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Quantity of each component

  • To make sure that a formulation does what it is supposed to, each chemical component must be present in a precisely measured quantity.
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Examples of formulations

  • Formulations are everywhere around us in day-to-day life. Examples include:
    • Fuels
    • Cleaning agents
    • Metal alloys
    • Fertilisers
    • Medicines

Jump to other topics

1Atomic Structure

2Chemical Bonding

3Quantitative Chemistry

4Chemical Changes

5Energy Changes

6The Rate & Extent of Chemical Change

7Organic Chemistry

8Chemical Analysis

9Chemistry of the Atmosphere

10Using Resources

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