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Do you think that a chemical reaction ha...

Do you think that a chemical reaction has taken place in the flask? Give reasons. Do the weights of the flask and its contents change during activity?

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  • ATOMS AND MOLECULES

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VGS PUBLICATION-BRILLIANT-ATOMS ,MOLECULES AND CHEMICAL REACTIONS-EXERCISE
  1. Wet clothes dry after sometime – where does the water go? What happens...

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  2. What happens to sulphur on burning it in air?

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  3. Do you think that a chemical reaction has taken place in the flask? Gi...

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  4. What difference do you observe in percentage of copper, carbon and oxy...

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  5. How do we write the symbols for calcium, chlorine, chromium ?

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  6. Would you be able to recognise the elements of the table -2, have symb...

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  7. Why do some elements be monoatomic?

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  8. Why do some elements form diatomic or triatomic molecules? Why do elem...

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  9. What is valency?

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  10. Can you write the formula of carbon dioxide and carbon monoxide? Try ...

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  11. How many molecules are there in 18 grams of water? How many atoms are ...

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  12. Did you notice the colour coating on silver and copper articles?

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  13. How did the element hydrogen get its name?

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  14. What is an atom?

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  15. What is an Avagadro number? What is its value?

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  16. Father of modern chemistry is……..

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  17. What is the law of conservation of mass according to chemical equation...

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  18. Who proposed Law of conservation?

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  19. State the following law of constant proportions.

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  20. Define chemical combination and give an example.

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