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5) Burning of fossil fuels releases harmful gases into the atmosphere.
these harmful gases cause acid rain.
the harmful gases released by vehicular pollution causes global warming.
6) Evaporation is the process of a substance in a liquid state changing to a gaseous state due to an increase in temperature and/or pressure. Factors affecting Evaporation are: 1. Surface area 2. Humidity 3. Presence of wind 4. Temperature.
7)1)Relative molecular mass or molecular weight is the mass of a molecule. It is calculated as the sum of the relative atomic masses of each constituent element multiplied by the number of atoms of that element in the molecular formula.
a)CH4 = 16. b)NH3= 14
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