Biogas is produced by anaerobic digestion of organic matter and consists mainly of methane (50-70%) and carbon dioxide (30-40%), with traces of H₂S, NH₃. Methane is the combustible component. It is a renewable fuel. The waste slurry is used as manure.
Explanation:
Chadwick bombarded beryllium (Be) with alpha particles from polonium, producing a highly penetrating neutral radiation, which he identified as neutrons: ⁹Be + ⁴He → ¹²C + ¹n. Gold was used by Rutherford for nucleus discovery. Uranium for fission. Lead for shielding.
Explanation:
In the liver, methanol is oxidized to formaldehyde, then to formic acid, which damages the optic nerve and can cause blindness or death. Ethanol is used as an antidote by competing for the enzyme alcohol dehydrogenase.
Explanation:
Hydration of cement is exothermic (heat of hydration). In large concrete pours, this heat can cause thermal cracking. Cooling is sometimes needed.
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