Carbon: An Important Element — Science STD 9 — Question
Maharashtra BoardEnglish MediumSTD 9ScienceCarbon: An Important Element5 Marks
Question
What is a compound? How are compounds formed?
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Answer
A compound is a substance formed when two or more elements are chemically bonded with each other in definite proportion by weight.
When atoms or two or more different elements chemically react with each other in a definite proportion by weight, a compound is formed.
The properties of a compound are altogether different from its constituent elements.
Example: Pure water is a compound made up of two elements Hydrogen and Oxygen. Hydrogen (H) atoms and oxygen ( O ) atoms have chemically reacted with each other in definite proportion to form a compoundwater $\left( H _2 O \right)$. The proportion of hydrogen and oxygen in water by volume is $2: 1$ and by weight is $1: 8$ respectively.
The properties of water are altogether different from the properties of its constituent elements, hydrogen and oxygen.
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