Page 50 - ICSE Chemistry 6

D. Answer in short.
1. Classify ma er.
2. Describe pure substances.
3. How are elements classifi ed on the basis of their proper es?
4. Defi ne an atom. Can atoms exist independently?
5. Why are noble (inert) gases named so?
6. Write the symbols of the following elements.
(a) Aluminium (b) Neon (c) Oxygen (d) Iron
(e) Carbon (f) Calcium (g) Helium (h) Sulphur
(i) Copper (j) Hydrogen (k) Nitrogen (l) Sodium
7. What is a molecule? Give examples.
8. Show diagramma c representa on of nitrogen dioxide molecule and zinc chloride molecule.

AT LENGTH
A. Explain the following terms.
1. Metal 2. Metalloid 3. Symbol 4. Atom 5. Mixture 6. Magne c separa on

B. Diff eren ate between the following.
1. Metals and non-metals 2. Atoms and molecules 3. Sediment and supernatant liquid

4. Residue and fi ltrate 5. Sedimenta on and decanta on 6. Compound and mixture
C. Answer in detail.
1. What is an element? Give examples and list the proper es of an element.
2. How are compounds formed? Write the proper es of a compound.

3. How are elements diff erent from compounds?
4. Write the uses of the following elements and compounds.
(a) Copper (b) Tungsten (c) Pla num (d) Iron (e) Plas c
(f) Aluminium (g) Carbon dioxide (h) Sand (i) Chlorine (j) Argon
5. What are mixtures? Explain with the help of an example. List the characteris cs of mixtures.
6. Explain sedimenta on and decanta on taking a mixture of sand and water as an example.
7. Write a note on evapora on as a method of separa on of compounds of a mixture.
8. How is salt prepared from sea water?

OBSERVE AND PERFORM

Observe the given image carefully and answer the following ques ons.
1. Name the method of separa on shown in the image.
2. For what other purpose can you use this method?

3. Describe the method of separa on shown here in detail.

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