Lavoisier is known for the law of conservation of mass, naming oxygen/hydrogen, and establishing chemistry as a quantitative science. Dalton proposed atomic theory; Mendeleev periodic table.
Explanation:
The 'ozone hole' is most prominent over Antarctica during spring due to unique polar stratospheric clouds and CFC accumulation. Arctic ozone depletion also occurs but is less severe.
Explanation:
Ethene (C₂H₄) adds Br₂ across the double bond to form 1,2-dibromoethane. Bromine water decolorizes, a test for unsaturation. Alkanes undergo substitution.
Explanation:
CaSO₄·½H₂O readily absorbs moisture to set to CaSO₄·2H₂O (gypsum), becoming hard and useless for molding. So it must be kept dry. Reaction: CaSO₄·½H₂O + 1½H₂O → CaSO₄·2H₂O.
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