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Is Matter Around Us Pure ? — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceIs Matter Around Us Pure ?3 Marks
Question
What is meant by (i) elements (ii) compounds, and (iii) mixtures? Write down the names of two elements, two compounds and two mixtures.
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Answer

  1. Elements: An element is a substance which cannot be split up into two or more simpler substances by the usual chemical methods of applying heat, light or electricity.

Examples: Hydrogen, Oxygen.

  1. Compounds: A compound is a substance made up of two or more elements chemically combined in a fixed proportion by mass.

Examples: Sodium chloride, calcium carbonate.

  1. Mixtures: A mixture is a substance which consists of two or more elements or compounds not chemically combined together.

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