Online Class 9 Science Notes - Chapter 2 – Is Matter Around us Pure Compounds A compound is a substance made up of two or more elements chemically combined in the fixed proportion by mass. Eg:-Water is a compound made up of two elements hydrogen and oxygen, chemically combined in a fixed proportion of 1:8 by mass. Some of the examples of compounds are – Ammonia, carbon dioxide, ice, steam, methane, glucose, baking soda and sodium hydroxide. Compounds can be further divided into three classes:- Acids Base Salts For questions answers, worksheets on Food, click Class 9th Science . Properties of Compound A compound cannot be separated into its components by physical methods. The properties of a compound are entirely different from those of its constituent elements Energy is usually either given out or absorbed during the preparation of a compound. A compound has a fixed melting and boiling point The composition of a compound is fixed; the constituents are pr
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