Rigid PVC (unplasticized, uPVC) is hard, strong, and resistant to chemicals and weathering, making it ideal for pipes, window frames, and fittings. Flexible PVC uses plasticizers. It is not biodegradable. Transparency depends on additives; generally it's translucent. Its chemical resistance is due to the chlorine content.
Explanation:
Thermosets (e.g., Bakelite) form extensive cross-links between polymer chains, making them rigid. Heating breaks bonds but degrades, not remolds. Thermoplastics are linear/branched.
Explanation:
Baking soda (NaHCO₃) is an anhydrous salt and does not contain water of crystallization. Blue vitriol (CuSO₄·5H₂O), washing soda (Na₂CO₃·10H₂O), and gypsum (CaSO₄·2H₂O) all contain fixed water molecules integrated into their crystal lattice, which gives them their specific shape and color.
Explanation:
Sodium lauryl sulfate (CH₃(CH₂)₁₁OSO₃Na) is a synthetic detergent with a sulfate group. Sodium stearate and potassium palmitate are soaps (carboxylate salts). Calcium oleate is soap scum.
No comments yet. Be the first to start the discussion!