Sodium bicarbonate (NaHCO₃) is an acidic salt because it contains a replaceable hydrogen atom (can neutralize bases). Its aqueous solution is mildly basic due to hydrolysis, but chemically it is an acid salt (formed by partial replacement of H of carbonic acid). K₂SO₄ is normal salt, CaOCl₂ is mixed salt, Na₂CO₃ is normal salt. Acid salts can react with bases.
Explanation:
Enzymes are proteins (except ribozymes which are RNA). They have specific 3D structures with active sites. They catalyze biological reactions. Denatured by heat or extreme pH.
Explanation:
Electroplating is the application of electrolytic cells to deposit a thin, protective, or decorative layer of a metal (like gold, silver, or chromium) onto a conductive object. Electrolysis is the general process of using electricity to drive a non-spontaneous chemical reaction.
Explanation:
Mendeleev placed Cobalt (atomic mass 58.9) before Nickel (atomic mass 58.7) to maintain chemical similarities, violating his own periodic law based on atomic mass. Isotopes weren't an issue then, and H's position was ambiguous, but the Co/Ni placement is a classic anomaly of his atomic mass-based table.
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