Terylene is a synthetic fiber belonging to the polyester family. Chemically, it is polyethylene terephthalate (PET), formed by the condensation polymerization of ethylene glycol and terephthalic acid. It is widely used in textiles, plastic bottles, and recording tapes.
Explanation:
Number of half-lives = total time / half-life = 10/5 = 2. Fraction remaining = (1/2)ⁿ = (1/2)² = 1/4. Thus 25% remains. After 3 half-lives (15 years) it would be 1/8.
Explanation:
Luster is a characteristic physical property of metals, but some non-metals also exhibit a shiny appearance. Iodine is a non-metal that forms dark purple, lustrous crystalline solids. Sulphur is dull yellow, phosphorus is white/red and waxy, and carbon (as graphite/coal) is generally dull.
Explanation:
Neutralization: Acid + Base → Salt + Water. Example: HCl + NaOH → NaCl + H₂O. It is a double displacement reaction. The pH of the resulting solution may be neutral, acidic, or basic depending on the strengths of the acid and base.
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