give reasons for the following
Answers
1. Inactive nitrogen is used in electric bulbs to prolong the life of the filament, and liquid nitrogen is used to store living cells and tissues as it’s freezing temperature can stop the metabolism without destroying it.
2. CO2 molecules are heavier than oxygen molecules and when’s the CO2 in the extinguisher expands into a gas , it disrupts oxygen supply and puts out fire.
3. magnesium burns in air with a dazzling white flame to give magnesium oxide, the mass of MgO is heavier as the mass of oxygen gets added with the mass of magnesium, so it is comparatively heavier.
4. On a cloudy day there is a lot of humidity and we know that the atmosphere can hold only up to a certain amount of water vapour. So if humidity increases the rate of evaporation decreases.