Why is hydrogen written H2 instead of H?
poojaoberoi:
See this is because substances like Oxygen, Hydrogen,Nitrogen chlorine are present as diatomic state. 2 atoms means a molecule. So, we can say that they are present in molecular form. We always find O2,H2,Cl2 and S8(polyatomic) and not O,H,Cl,S. These atoms as a sinngle are not stable or fixed. So, they have to be in environment. If they are not stable they will not be in environment.
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hydrogen is written in H
But when reaction we take two molecules of hydrogen so we written H2
But when reaction we take two molecules of hydrogen so we written H2
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Que: Why sound cannot be heard directly on the surface of moon?
Ans: Because there is no air on the moon to carry the sound waves.So, we cannot talk to one another directly on the moon as we do on earth,even though we may be very close. Similarly there is no air in outer space to carry sound waves. It is all vacuum. The astronauts who land on moon talk to one another through wireless sets using radio waves. This is because radio waves can travel even through vacuum.
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