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Under what conditions the zeros in a num...

Under what conditions the zeros in a number are significant ?

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PRADEEP-SOME BASIC CONCEPTS OF CHEMISTRY-ADDITIONAL QUESTIONS (SHORT ANSWER QUESTIONS)
  1. What does symbol SI signify ? Name the seven basic SI units ?

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  2. Define precision and accuracy.

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  3. What do you mean by significant figures?

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  4. Under what conditions the zeros in a number are significant ?

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  5. What do you understand by unit conversion factor ? How does it help to...

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  6. After rounding off 1.235 and 1.225, we will have their answer respecti...

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  7. Give one experiment involving a chemical reaction to prove that the la...

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  8. Copper oxide obtained by heating copper carbonate or copper nitrate co...

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  9. N and O combine with H to form NH(3) and H(2)O and they combine with e...

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  10. Define Gay Lussac's law of gaseous volume. Explain with one suitable e...

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  11. What are the postulates of Modern Atomic Theory?

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  12. Which isotope is used as a reference on the atomic scale ? What is one...

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  13. Why atomic mass is an average value ? Explain with suitable example.

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  14. How is mole related to (i) mass, (ii) volume and (iii) number of mol...

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  15. What is the SI definition of mole?

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  16. Comment on the statement : '1 mole of hydrogen'

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  17. What is the difference between (i)Normality and Molarity ? (ii) Molari...

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  18. Define Empirical formula and Molecular formula. What is the relationsh...

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  19. Write the empirical formulae of the following : (i) N(2)O(4) (ii)C(6...

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  20. What is a limiting reagent ? Explain with a suitable example.

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