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:
- Increased pollution of air and water by chemical processes in industries.
- Depletion of natural resources. Industrialization has led to depletion of forests (deforestation),/minerals, petroleum, coal, etc.
- 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 A | Column B |
| 1. Antoine Lavoisier | a. Designed the periodic table of elements |
| 2. Dl Mendeleev | b. Discovered the nucleus of the atom. |
| 3. Marie Curie | c. Named oxygen and hydrogen |
| 4. Emest Rutherford | d. World’s foremost materials chemist |
| 5. CNR Rao | e. Insolated radium and polonium |
Answer:
| Column A | Column B |
| 1. Antoine Lavoisier | c. Named oxygen and hydrogen |
| 2. Dl Mendeleev | a. Designed the periodic table of elements |
| 3. Marie Curie | e. Insolated radium and polonium |
| 4. Emest Rutherford | b. Discovered the nucleus of the atom. |
| 5. CNR Rao | d. 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