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What do the following denote ? (i) N...

What do the following denote ?
(i) N, (ii) 2N, (iii) `N_(2)` , (iv) `2N_(2)`

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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
  1. (a) In water from does oxygen gas occur in nature ? (b) In what fo...

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  2. What is the difference between 2H and H(2) ?

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  3. What do the following denote ? (i) N, (ii) 2N, (iii) N(2) , (iv) 2...

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  4. What is the significance of the formula of a substance ?

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  5. What is the significance of the formula H(2)O ?

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  6. The molecular formula of glucose is C(6)H(12)O(6). Calculate its molec...

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  7. Calculate the molecular masses of the following : (a) Hydrogen, H(2)...

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  8. Calculate the molecular masses of the following compounds : (a) Met...

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  9. Calculate the molecular masses of the following compounds : (a) Me...

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  10. Calculate the molecular mass of ethanoic acid, CH(3)COOH. (Atomic ma...

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  11. Calculate the molecular mass of nitric acid, HNO(3). (Atomic masses : ...

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  12. Calculate the molecular mass of chloroform (CHCl(3)). (Atomic masses...

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  13. Calculate the molecular mass of hydrogen bromide (HBr). (Atomic masses...

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  14. Calculate the molecular masses of the following compounds : (a) Hy...

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  15. State the law of conservation of mass. Give one example to illustrate...

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  16. State the law of constant proportions. Give one example to illustrate ...

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  17. (a) State the various postulates of Dalton's atomic theory of matter...

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  18. (a) What is the significance of the symbol of an element ? Explain w...

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  19. (a) What is an atom ? How do atoms usually exist ? (b) What i...

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  20. (a) Define atomic mass unit. What is its symbol ? (b) Define atomic...

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