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Write any two changes which are harmful ...

Write any two changes which are harmful in our daily life. Explain why you consider them harmful?

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  1. Example for chemical change

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  2. ln the process of burning of fuel chemi- cal energy is changed into he...

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  3. Substance which liberate a lot of t while burnig are caused.......

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  4. ...... energy is needed for the of an engine of vehicles

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  5. Digestion of food, Condensation of clouds lead to rain, Rusting of ir...

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  6. Evaporation of water, Melting of ghee, Rusting or iron, Dissolving su...

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  7. Petroleum, Natural gas, Goal, Biogas

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  8. Find out the energy changes in the following statements? An electric ...

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  9. How does coal, petroleum and natural gas are produced?

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  10. The energy sources like sunlight, wind, water and biogas are used mor...

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  11. Find out the situations where solar pan-. els are made use of and list...

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  12. What are the solutions to solve the problem of energy crisis?

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  13. Melting of' ice is a physical change while burning of magnesium is a c...

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  14. Explain why burning of wood and cut- ting It into small pieces are con...

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  15. Curdling of milk is a permanent Change Why?

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  16. Write any two changes which are harmful in our daily life. Explain why...

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  17. Find out the energy changes in the fol- lowing statements?

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  18. When a mixer grinder is works on, electrical energy [s transferred to ...

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  19. "Sun- An unending source of energy. Are you agree with the statement?

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  20. Give the important properties of physi- cal changes?

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