Chemistry in Daily Life

Samacheer Book Back Questions And Answers For Science Standard 7 Term 3 “Chemistry in Daily Life“

I. Choose the correct answers:
1. A drug effective in the treatment of pneumonia, and bronchitis, is _____.
(a) Streptomycin
(b) Chloramphenicol
(c) Penicillin
(d) Sulphaguanidine

2. Aspirin is _____.
(a) Antibiotic
(b) Antipyretic
(c) Sedative
(d) Psychedelic

3. _____ are that neutralize stomach acid.
(a) Antacid
(b) Antipyretic
(c) Analgesic
(d) Antihistanics

4. The lowest temperature at which a substance catch the fire is called its _____.
(a) Boiling point
(b) Melting point
(c) Critical temperature
(d) Ignition temperature

5. Which is the hottest part in the flame of candle _____.
(a) Blue
(b) Yellow
(c) Black
(d) Way part

II. Fill in the blanks:
1. Penicillin was first discovered by _____.
2. World ORS Day is _____.
3. Combustion is a chemical reaction in which and substance react with _____.
4. In the presence of water, the ignition temperature of paper is _____.
5. Fire produced by oil cannot be controlled by _____.

Answers:
1. Alexander Fleming
2. July 29
3. Oxidizing agent
4. Not reached
5. Water

III. True or False – If False, give the correct answer:
1. Antibiotics does work for viruses like cold and flu.
2. Analgesics are the substances that lower the temperature during fever.
3. All fuels form flame.
4. Oxygen is necessary for combustion.
5. Burning wood and coal causes pollution of air.

Answers:
1. False (Antibiotics does not work for viruses like cold and flu)
2. False (Antipyretic are the substances that lower the temperature during fever)
3. False (All fuels do not form flame)
4. True
5. True

IV. Match the following:
1. Antipyretic                   A. Reduce pain
2. Analgesic                     B. Reduce body temperature
3. Antacid                        C. Spontaneous combustion
4. Phosphorus                 D. ORS Solution
5. Carbon – di – oxide     E. Leads to respiratory problem

Answers:
1. B
2. A
3. D
4. C
5. E

V. Analogy:
1. Inner zone of flame:: _____, outer zone of flame::_____
2. Tincture:: _____, Histamine:: _____

Answers:
1. Black, Blue
2. Antiseptic, Chemical messenger

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