Explain the Modes of valency ?

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Explain the ANS Isotope?

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What is determining factor in the oxidation reduction reaction?

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in Einstein's mass energy relation e=mc2 for what is c used or why is light required for reactions. Because the reactions are with help of neutrons

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If the stopper if a bottle has stuck, sometimes it may be removed by heating the neck, why ?

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Explain the Chemical change?

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What materials are needed in making glass ?

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Of what substance are lead pencils made ?

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Explain the Atom?

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What is chemistry ?

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Why are the bright circles of light seem under the trees, when the sun shines?

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How are specific gravity and density related?

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