8. Give reasons for the following:
a) Carbon dioxide acts as a greenhouse gas.
b) Argon is used to fill electric bulbs.
c) CFC's should not be used in refrigerators or AC machines.
d) Tall chimneys with filters to be used in factories
e) Plantation is required more and more in our surroundings
Answers
Answer:
Explanation:
a] That's because the glass walls of the greenhouse trap the Sun's heat. The greenhouse effect works much the same way on Earth. Gases in the atmosphere, such as carbon dioxide, trap heat just like the glass roof of a greenhouse. These heat-trapping gases are called greenhouse gases.
b] Electric bulbs are usually filled with argon to prolong the life of the filament
c] The interim replacements for CFCs are hydrochlorofluorocarbons (HCFCs), which deplete stratospheric ozone, but to a much lesser extent than CFCs. Ultimately, hydrofluorocarbons (HFCs) will replace HCFCs. Unlike CFCs and HCFCs, HFCs have an ozone depletion potential .
d] Long chimneys take the harmful smoke and gases produced in the factories high up in the air so as to reduce its harmful effects on the ground.
e] Plantation plays an important role in maintaining the balance in nature. It has a great impact on the environment by reducing incidences of global warming. Deforestation( cutting down of trees) creates havoc in nature and ends up increasing the levels of greenhouse gases on earthe]
Answer:
Ans.1
The closed glass chamber of the bulb contains an inactive (inert) gas, argon. The glass chamber can not be filled with air as the presence of oxygen will cause the filament to burn. The glass chamber can not be made vacuum. As in vacuum condition, the filament will evaporate because of very high temperature making the bulb unusable. The only solution to these problems is an inert gas. The inert gas within the bulb will maintain a particular pressure, preventing the filament from evaporating. An inert gas will not react with the filament. Nitrogen is also used like argon since it is unreactive.
Explanation:
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