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If 100 grams of calcium carbonate (whet...

If 100 grams of calcium carbonate (whether in the form of marble or chalk) are decomposed completely, then 56 grams of calcium oxide and 44 grams of carbon dioxide are obtained'. Which law of chemical combination is illustrated by this statement ?

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The correct Answer is:
Law of conservation of mass
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LAKHMIR SINGH & MANJIT KAUR-ATOMS AND MOLECULES-Exercise
  1. Name any two laws of chemical combination.

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  2. If 100 grams of pure water taken from different sources is decomposed ...

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  3. If 100 grams of calcium carbonate (whether in the form of marble or ...

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  4. What are the builiding blocks of matter ?

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  5. How is the size of an atom indicated ?

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  6. Name the unit in which the radius of an atom is usually expressed.

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  7. Write the relation between nanometre and metre.

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  8. The radius of an oxygen atom is 0.073 nm. What does the symbol 'nm' ...

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  9. State whether the following statement is true or false : The symbol...

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  10. Define 'molecular mass' of a substance.

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

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

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

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

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

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

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

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

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

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

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