LPG (propane/butane) is odorless. A small amount of strong-smelling mercaptan (ethanethiol) is added to help detect gas leaks, preventing accidents. Natural gas also has odorant. Mercaptans contain sulfur, and their smell is detectable at very low concentrations. Calorific value, temperature, performance are unaffected. Safety is primary.
Explanation:
Saponification is the alkaline hydrolysis of fats or oils (which are esters of fatty acids) using a strong base like NaOH or KOH. This reaction produces glycerol and the sodium or potassium salts of fatty acids, which are soaps. It is an irreversible reaction.
Explanation:
NaCl is the product of neutralization of HCl (strong acid) and NaOH (strong base). Neither ion hydrolyses appreciably, so the solution remains neutral (pH=7). Salts of strong acid + weak base are acidic (NH₄Cl), weak acid + strong base are basic (CH₃COONa).
Explanation:
The mass of an atom is almost entirely concentrated in its tiny central nucleus. This is because the nucleus contains protons and neutrons, which are much heavier than the extranuclear electrons. Since electrons have negligible mass, R correctly explains why the mass is localized in the nucleus.
No comments yet. Be the first to start the discussion!