Question

19. Observe the pictures given below and tell .
1) which gas is necessary for the given actions to take place.
ii) What are these actions?
iii) How it supports the activities explain? ​

Answer 1

Answer:

1) Oxygen gas is necessary for the given actions to take place.

2) Combustion.

3)It supports the activities bcz without oxygen these activities can't be done.

Answer 2

Answer:

1) Oxygen is the gas needed for the above.

2)The first action is Respiration and second is combustion.

3) Oxygen is essential for respiration of living organisms, and it supports combustion because it is essential for burning components.

Burning of candles involves addition of oxygen to carbon & hydrogen which forms carbon dioxide , water vapour and energy in the form of heat and light.

Fuel + Oxygen → Carbon dioxide + water vapour + Energy (heat and light)

Respiration involves inhaling oxygen to carbon & hydrogen present in food material which forms carbon dioxide , water vapor and energy in the form of heat.

Glucose + Oxygen → Carbon dioxide + water vapour + Energy (heat)