Amylase is an enzyme (biological catalyst) that breaks down starch. Platinum, V₂O₅, and iron are inorganic chemical catalysts. Enzymes are proteins, highly specific, and work under mild conditions.
Explanation:
Zinc loses electrons (Zn → Zn²⁺ + 2e⁻) and thus is oxidized. The substance that gets oxidized is the reducing agent. Copper sulfate is reduced (Cu²⁺ to Cu) and is the oxidizing agent. The reducing agent donates electrons.
Explanation:
Ethylene glycol (1,2-ethanediol) is the main component of antifreeze, lowering the freezing point of water. Methanol is toxic, ethanol can be used but evaporates, glycerol is viscous. Ethylene glycol is poisonous if ingested. Propylene glycol is a safer alternative.
Explanation:
There are three naturally occurring radioactive decay series: the Uranium series (4n+2), the Thorium series (4n), and the Actinium series (4n+3). The Neptunium series (4n+1) is an artificial series; its longest-lived isotope, Neptunium-237, has a half-life too short to have survived since the Earth's formation.
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