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Which of the following are physical chan...

Which of the following are physical changes and which are chemical changes ?
Burning of paper

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LAKHMIR SINGH & MANJIT KAUR-PHYSICAL AND CHEMICAL CHANGES-EXERCISE
  1. Which of the following are physical changes and which are chemical cha...

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  2. Which of the following are physical changes and which are chemical cha...

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  3. Which of the following are physical changes and which are chemical cha...

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  4. Which of the following are physical changes and which are chemical cha...

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  5. Fill in the following blanks with suitable words : Changes in which ...

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  6. Fill in the following blanks with suitable words : Melting of wax is...

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  7. Fill in the following blanks with suitable words : Souring of milk i...

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  8. Fill in the following blanks with suitable words : The chemical name...

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  9. Fill in the following blanks with suitable words : When carbon dioxi...

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  10. Fill in the following blanks with suitable words : The two methods b...

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  11. Fill in the following blanks with suitable words : The process of de...

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  12. Fill in the following blanks with suitable words : The presence of ...

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  13. Fill in the following blanks with suitable words : Some susbtances c...

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  14. Why is an Iron grill painted frequently ?

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  15. Explain why, iron pipes for carrying water are coated with zinc.

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  16. Why are the tools and machine parts made of iron smeared with grease o...

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  17. Explain how, painting of an Iron gate prevents it from rusting.

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  18. Explain why, rusting of Iron objects is faster in coastal areas than i...

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  19. What is meant by galvanisation? Why is it done?

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  20. State two ways to prevent the rusting of iron.

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