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Fill in the following blanks with suita...

Fill in the following blanks with suitable words :
(a) In water , the proportion of oxygen and hydrogen is `"…………."` by mass.
(b) In a chemical reaction, the sum of the masses of reactants and the products remains unchanged. This is called `"..........."`.

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The correct Answer is:
(a) `8 : 1` , (b) conservation of mass
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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
  1. Define 'molecular mass' of a substance.

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  2. What is meant by saying that 'the molecular mass of oxygen is 32'...

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  3. Fill in the following blanks with suitable words : (a) In water , t...

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  4. (a) Name the element used as a standard for atomic mass scale. (b) W...

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  5. Give one major drawback to Dalton's atomic theory of matter.

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  6. Dalton's atomic theory says that atoms are indivisible. Is this stat...

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  7. Is it possible to see atoms these days? Explain your answer.

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  8. What is meant by the symbol of an element ? Explain with example...

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  9. (a) Give two symbols which have been derived from the "English names ...

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  10. Give the names and symbols of five familiar substances which you thin...

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  11. State the chemical symbols for the following element: Sodium, Potass...

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  12. Name the element represented by the following symbols : Hg, Pb, Au, ...

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  13. What is meant by atomicity ? Explain with two examples.

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  14. What is the atomicity of the following ? (a) Oxygen , (b) Ozone , (...

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  15. What is meant by a chemical formula ? Write the folrmulae of one elem...

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  16. Write the formulae of the following compounds. Also name the element ...

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  17. Explain the difference between 2 N and N(2).

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  18. What do the following abbreviations stand for ? (i) O , (ii) 2O ,...

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  19. What do the symbols, H(2), S and O(4) mean in the formula H(2)SO(...

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  20. (a) In water from does oxygen gas occur in nature ? (b) In what fo...

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