Distillation can be used to prepare pure water from tap water by first, evaporating the tap water at T = 100 C, by this only the pure water will be evaporated. then condensing the evaporated water by help of an ice bath to collect the pure water that is distilled
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d the amount of matter in a closed system is the same at the start of a reaction as at the end of the reaction
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when an optical telescope located on the ground is used to view the sky the image has to surpass through the earth's atmosphere which is polluted. so the resolution wont be clear. When viewed on a mountain top both optical and infrared telescopes would perform better as the air above the atmosphere is less depth and cleaner.
