Global warming, caused by increased greenhouse gases, leads to melting of polar ice, thermal expansion of oceans, rise in sea level, and changes in weather patterns (climate change). It does not cool the Earth or decrease CO₂.
Explanation:
Ammonia reacts with CO₂ to produce urea: 2NH₃ + CO₂ → NH₂COONH₄ → (NH₂)₂CO + H₂O. It is also used to make ammonium sulfate, ammonium nitrate, DAP, etc. Superphosphate is made by treating rock phosphate with sulfuric acid; no ammonia. Gypsum is CaSO₄·2H₂O. Potassium sulfate is K₂SO₄. Ammonia is a key intermediate in nitrogenous fertilizers.
Explanation:
Phenolphthalein is a synthetic acid-base indicator, organic compound prepared in the lab. Litmus is a natural dye from lichens. Turmeric is a natural indicator (yellow in acid, reddish brown in base). Red cabbage juice is natural. Synthetic indicators are often used in titrations: methyl orange, phenolphthalein.
Explanation:
Centrifugation spins the mixture at high speed, causing denser particles (skimmed milk) to settle at the bottom while lighter cream floats on top. This is based on density differences. Distillation is for liquids, filtration for insoluble solids, sublimation for sublimable solids.
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