Chemistry ICSE Class 6 Important Questions 1 Chemistry an Introduction

Practice Questions

Question 1.
Name various fields where chemistry has contributed.
Answer:

  • Agriculture – Fertilizers, pesticides, fungicides, etc increase crop yield.
  • Industry – Rubber, plastic, steel, synthetic fibres, etc. are developed.
  • Medicine – Penicillin, tetracycline, etc. are used to treat infection. Some drugs eradicate diseases like polio and small pox and increase life span.
  • Petrochemicals – Diesel, petrol, LPG etc. are obtained using chemical processes from petroleum.
  • Electronics – Manufacture of electrical circuits in TV, radio, computer etc. using chemical properties of silicon and
    germanium.
  • Building materials – Cement, bricks, paints, etc are manufactured by chemical processes.
  • Extraction of metals from their ores.

Question 2.
List few harmful effects of chemistry.
Answer:

  1. Increased pollution of air and water by chemical processes in industries.
  2. Depletion of natural resources. Industrialization has led to depletion of forests (deforestation),/minerals, petroleum, coal, etc.
  3. Destructive weapons – Like TNT (trinitrotoluene), RDX (Research Department Explosive), atomic bomb and hydrogen bomb can cause massive destruction if misused.

Question 3.
Match the scientists in column A with their contribution to chemistry in column B.

Column AColumn B
1. Antoine Lavoisiera. Designed the periodic table of elements
2. Dl Mendeleevb. Discovered the nucleus of the atom.
3. Marie Curiec. Named oxygen and hydrogen
4. Emest Rutherfordd. World’s foremost materials chemist
5. CNR Raoe. Insolated radium and polonium

Answer:

Column AColumn B
1. Antoine Lavoisierc. Named oxygen and hydrogen
2. Dl Mendeleeva. Designed the periodic table of elements
3. Marie Curiee. Insolated radium and polonium
4. Emest Rutherfordb. Discovered the nucleus of the atom.
5. CNR Raod. World’s foremost materials chemist

Question 5.
Fill in the blanks :
1. ………… is a system of acquiring knowledge about natural processes around us, such as day and night, growth of a tree, formation of curd, etc.
Answer:
Science is a system of acquiring knowledge about natural processes around us, such as day and night, growth of a tree, formation of curd, etc.

2. The system of acquiring knowledge is based on ………… and ……….
Answer:
The system of acquiring knowledge is based on observation and experimentation.

3. The people who carry out various experiments to study science are called ………….
Answer:
The people who cany out various experiments to study science are called scientists.

4. A …………. is a place where experiments in chemistry are performed.
Answer:
A Chemistry laboratory is a place where experiments in chemistry are performed.

5. Round – bottom flask is generally used for ………….
Answer:
Round – bottom flask is generally used for heating liquids.

6. …………… flask is used for mixing or stirring liquids but should not be used for heating.
Answer:
Flat-bottom flask is used for mixing or stirring liquids but should not be used for heating.

Question 6.
How does deforestation damage our environment?
Answer:
Deforestation results in an increase in the concentration of carbon-dioxide in the air which causes rise in the temperature (global wanning). It also results in less rainfall.

ICSE Class 6 Chemistry Important Questions

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