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Are the materials present before burning...

Are the materials present before burning and after burning the same ?

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NCERT TELUGU-CHANGS AROUND US-EXERCISE
  1. What are physical changes ?

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  2. Do you find any new material after burning ?

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  3. Are the materials present before burning and after burning the same ?

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  4. Can you name some changes which form new substances ?

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  5. Are there any other ways by which rusting of iron can be prevented ?

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  6. Do these articles handles of cycles etc. rust ? If not why ?

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  7. what is the percentage of sources of water on earth ?

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  8. How can we know that a given article is made up of iron or not ?

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  9. What is galvanization?

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  10. What do you observe on the cut pieces of fruits and vegetables? Why do...

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  11. How can we prevent browning of cut vegetables and fruits?

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  12. Does the ash formed look like Magnesium ribbon?

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  13. Do you think the magnesium ribbon and the ash have the same compositio...

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  14. What do you get by dissolving magnesium oxide in water?

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  15. Is magnesium hydroxide an acid or a base?

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  16. What will happen when iron nails dipped in copper sulphate solution?

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  17. What happens if you add vinegar (acetic acid) to baking soda (sodiumbi...

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  18. If you send carbondioxide into lime water what happens?

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  19. What is the difference between burning of camphor and evoparation of c...

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  20. What is crystallization?

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