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Elements, Compounds, Symbols And Formulae — CHEMISTRY STD 6 — Question

ICSE BoardEnglish MediumSTD 6CHEMISTRYElements, Compounds, Symbols And Formulae2 Marks
Question
Name the elements which form water.
How will you justify that water is a compound?
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Answer

The elements which form water are Hydrogen and oxygen.
Justification: Water has entirely different properties (i.e. is a liquid, extinguishes fire) from the elements it is made up of i.e. Hydrogen a gas catches fire oxygen a gas supporter of combustion.

1. Energy is needed to form water on combining O2 with H2.
2. We can not separate the constituents of water by simple physical means.

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