Question

Choose the molecule which has only one pi bond between carbon atoms a. CH2 = CHCOOH b. CH ≡ CH c. CH3CH = CH2 d. CH2 = CH - CH = CH2

Answer 1

Answer:

NCERT Solutions for Class 7 Science Chapter 4 Heat

September 25, 2019 by Sastry CBSE

NCERT Solutions for Class 7 Science Chapter 4 Heat

Topics and Sub Topics in Class 7 Science Chapter 4 Heat:

Section Name Topic Name

4 Heat

4.1 Hot and Cold

4.2 Measuring Temperature

4.3 Laboratory Thermometer

4.4 Transfer of Heat

4.5 Kinds of Clothes we Wear in Summer and Winter

Q.1. State similarities and differences between the laboratory thermometer and the clinical thermometer.

Ans. Similarities:

(i) Both thermometers consist of long narrow uniform glass tubes.

(ii) Both have a bulb at one end.

(iii) Both contain mercury in bulb.

(iv) Both use Celsius scale on the glass tube.

Differences:

(i) A clinical thermometer reads temperature 35°C to 45°C while the range of laboratory thermometer is -10°C to 110°C.

(ii) Clinical thermometer has a kink near the bulb while there is no kink in the laboratory thermometer.

Due to kink mercury does not fall down on its own in clinical thermometer.

Q.2. Give two examples each of conductors and insulators of heat.

Explanation: