Page 126 - ICSE Chemistry 6

15. What is Brownian mo on?
16. What is the diff erence between groundwater and well water?
17. State the importance of water cycle.
18. List any two uses of water.
19. What are the characteris cs of potable water?
20. How is a fi ltrate diff erent from a residue?
21. What is nitrogen fi xa on?
22. What is respira on?

23. Why are coal and petroleum commonly known as fossil fuels?
24. Why are respira on and photosynthesis considered opposite processes?
25. What is global warming?

D. Answer in detail.
1. Discuss the importance of chemistry.
2. Discuss the physical aspect of alchemy.
3. Discuss the contribu ons of Antoine Lavoisier and J.J. Thomson.
4. Write a note on clothing and chemistry.
5. How has the knowledge of chemistry helped in discovering new medicines?
6. Write the characteris cs of elements.
7. List the rules followed to assign the symbols to elements.
8. Diff eren ate between elements and compounds.
9. Discuss the uses of following elements and compounds: copper, silver, steel, coal, carbon dioxide,
sand, graphite and diamond.
10. With the help of an ac vity, show that proper es of a mixture depend on the quan ty of the
cons tuents present.
11. Discuss the proper es of ma er.
12. With the help of an ac vity, show that ma er off ers resistance.
13. Write the proper es of liquids.
14. With the help of an ac vity, show that gases can be compressed easily whereas solids cannot be
compressed and liquids can be compressed a li le.
15. State the explana on for the existence of three states of ma er.
16. What is anomalous expansion of water?
17. Defi ne the following terms: specifi c heat capacity, latent heat of fusion of ice and latent heat of
vaporiza on.
18. Discuss the importance of water.
19. With the help of an example, show that smaller the par cle size of the solute, faster the solu on will
be formed.
20. Write a note on the purifi ca on of water.
21. With the help of an ac vity, show that air is present everywhere.
22. Discuss the uses of oxygen, nitrogen and carbon dioxide.
23. Discuss the importance of air.
24. How is the composi on of air maintained in the atmosphere?
25. Discuss the causes and eff ects of air pollu on.

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