Class 9 Assignment (Chemistry)


  1. What is evaporation? Give one example of evaporation.
  2. On what factors the process of evaporation depend?
  3. Why doesevaporation cause cooling?
  4. Why do wet clothes dry faster in the sun than in shade?
  5. Why do wet clothes dry faster when spread in open?
  6. Why should we wear cotton cloths during summers?
  7. Is evaporation an exothermic or endothermic process?
  8. Define (i) humidity, (ii)absolute humidity, (iii)relative humidity. Which of these has no unit?
  9. Why does the water kept in an earthen port (matka) during hot summer days become cold?
  10. Under what condition of humidity no evaporation is possible?
  11. Evaporation of water increases under the conditions: 
      1. increase in temperature, decrease in surface area.
      2. increase in surface area, rise in temperature. 
      3. decrease in temperature, increase in surface area.
  12. Which of the liquids evaporate faster?
      1. Liquid having weak intermolecular forces
      2. Liquids having strong intermolecular forces.
Educator

M.Sc. in Chemistry, B.Ed. & 2 times CTET Qualified (2017 & 2019)

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