Chemistry In Daily Life Book Back Questions 7th Science Lesson 17
7th Science Lesson 17
17] Chemistry In Daily Life
Book Back Questions with Answer and Do You Know Box Content
Do You Know?
| New ORS | Grams/Litre | % | New ORS | Mmol/litre |
| Sodium chloride | 2.6 | 12.683 | Sodium | 75 |
| Glucose, anhydrous | 13.5 | 65.854 | Chloride | 65 |
| Potassium chloride | 1.5 | 7.317 | Glucose, anhydrous | 75 |
| Trisodium citrate, dehydrate | 2.9 | 14.146 | Potassium | 20 |
| Citrate | 10 | |||
| Total | 20.5 | 100.0 | Total Osmolarity | 245 |
Antibiotics don’t work for viruses like cold and the flu.
Anaesthetics: The first local anesthetic was cocaine was isolated from coca leaves by Albert Niemannin Germany, 1860.
Dettol Mixture of chloroxylenol and terpincol. Tincture Iodine + 2 to 3% alcohol – Water mixture. Soap, Iodoform, phenolic solutions, ethanol, Boric acid, are examples.
Natural antiseptics: Garlic, Turmeric, Aloevera
Fire chemical reaction: Oxygen + Heat + Fuel = Fire.
A candle flame is caused by vapour burning above the candle. This burning vapour is hotter than the surrounding air and is therefore less dense. So, by the principle of conversion, it “rises” so the flame is always upwards.
Choose the best answers:
1. A drug effective in the treatment of pneumonia, and bronchitis is _______________
(a) Streptomycin
(b) Chloramphenicol
(c) Penicillin
(d) Sulpha guanidine
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
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 _______________
State true or false. If false, correct the statement:
1. Antibiotics do work for viruses like cold.
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.
Match the following:
1. Antipyretic – reduce pain
2. Analgesic – reduce body temperature
3. Antacid – spontaneous combustion
4. Phosphorus – ORS Solution
5. Carbon-di-oxide – leads to respiratory problem
Complete the analogy:
1. Inner zone of flame :: _____________, outer zone of flame :: ____________
2. Tincture :: ________________, cistamine :: _________________
Very short answer:
1. First viral disease detected in human being was: __________________
2. ____________, ______________, ________________ are called greenhouse gases
3. Name a substance which can be used as an antiseptic as well as disinfectant?
4. What are the main constituents of Dettol?
5. Name the unit in which the calorific value of a fuel is expressed?
6. How many types of combustion are there?
7. What are the essential requirements for producing fire?
Answers:
Choose the correct answers:
1. Penicillin 2. Antipyretic 3. Antacid 4. Ignition Temperature 5. Blue
Fill in the blanks:
1. Alexander Fleming 2. July 29 3. Oxygen 4. Constant 5. Water
Say True or False:
1. True
2. False
Correct Statement: Analgesics or Pain killers are the pain suppressing chemicals.
3. False
Correct Statement: Substances which vaporizes during burning produces flames.
4. True
5. True
Match the following:
1. Reduces body temperature 2. Reduce pain 3. ORS solution 4. Spontaneous combustion 5. Leads to respiratory problem
Complete the analogy:
1. Black, Blue 2. Antiseptic, Disinfectant
Short answers:
1. Yellow fever 2. Carbon dioxide, Methane, Nitrous oxide 3. Dettol 4. Mixture of chloroxylenol and terpincol 5. kJ/kg 6. Three
7. Fuel, Air and Heat