PVC is made by addition polymerization of vinyl chloride (CH₂=CHCl). Ethene gives polythene, styrene gives polystyrene, tetrafluoroethene gives Teflon.
Explanation:
Radioactive decay is a first-order process because the rate of decay is proportional to the number of radioactive nuclei present. Half-life is constant, independent of initial amount.
Explanation:
Nitrogen molecule (N₂) has a triple bond between the two nitrogen atoms (N≡N), with bond order 3. This makes it very stable and relatively inert. O₂ has a double bond (O=O). CH₄ has four single C–H bonds. H₂O has two single O–H bonds. The triple bond in N₂ requires high energy to break, which is why N₂ is used as an inert atmosphere. Bond energy N≡N ≈ 946 kJ/mol.
Explanation:
In a neutral atom, number of protons = number of electrons = 18. Mass number = protons (18) + neutrons (22) = 40. This is ⁴⁰Ar. Number of neutrons alone doesn't determine mass number.
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