Page 128 - ICSE Chemistry 6

6. Compounds are made up of only one kind of molecules.
7. The La n name of potassium is kolim and its symbol is K.
8. The cons tuents of a compound cannot be separated by physical means like boiling and fi ltra on.
9. Magnesium is used as a disinfectant.
10. Magne c separa on is used when one of the components of a mixture is a magne c substance.
11. Ma er off ers resistance.
12. An atom exists independently.
13. The intermolecular force and the intermolecular space are responsible for determining the state of
ma er.
14. Liquids have more density as compared to solids.
15. Brownian movement is caused by the collision of molecules.

16. Saline water is unfi t for drinking, washing, irriga on and industrial purposes.
17. The three states of water can be interchanged into each other by changing the temperature.
18. Boiling water contains more heat energy in the form of latent heat that steam.
19. The largest amount of water is used in agriculture.
20. A fi lter bed consists of diff erent layers of sand, gravel and charcoal.
21. The composi on of air is constant everywhere.
22. Oxygen supports combus on.

23. Solid carbon dioxide known as dry ice is used as a refrigerant.
24. The burning of fossil fuels such as oil, natural gas and coal release oxygen into the atmosphere.
25. Plan ng more trees is the best solu on to air pollu on.

C. Answer in short.
1. How are the two main branches of science further divided?
2. What is food processing?
3. What is the use of paracetamol?
4. How has advancement in healthcare helped?

5. What is the use of chemicals in industries?
6. Give some examples of metalloids. State their proper es.
7. Write the symbols of the following elements: argon, beryllium, calcium, mercury, gold, iodine and
iron.
8. What is a molecular formula? What is the molecular formulae of magnesium oxide and ammonia?
9. How is a sediment diff erent from a supernatant?
10. Why is evapora on used?
11. Why do solids have a defi nite shape, mass and volume?
12. Why can liquids diff use?
13. Why is it so that gases have maximum capacity to fl ow?
14. What is diff usion?
15. What is vaporiza on?

16. Where is surface water present? Where will you fi nd groundwater?
17. How are clouds formed?

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