An amalgam is an alloy of mercury with another metal. For example, sodium amalgam is used as a reducing agent; dental amalgam contains mercury, silver, tin, and copper. Bronze is Cu+Sn, brass is Cu+Zn, solder is Pb+Sn.
Explanation:
Water hardness is classified into temporary and permanent. Temporary hardness is caused by the dissolved bicarbonates of calcium and magnesium (Ca(HCO3)2 and Mg(HCO3)2). It is called 'temporary' because it can be easily removed by simple boiling, which decomposes the soluble bicarbonates into insoluble carbonates.
Explanation:
Haber process synthesizes ammonia using iron catalyst. Solvay process for soda ash uses no solid catalyst but involves reactions with CO₂ and ammonia. Bayer's process for alumina uses NaOH, no catalyst. Hall-Héroult process is electrolytic for aluminium. Catalysis is key in many industrial processes: Contact (V₂O₅), Ostwald (Pt), hydrogenation (Ni).
Explanation:
Carbon-14 (half-life ~5730 years) is used to determine the age of archaeological and geological organic samples up to ~50,000 years. Cobalt-60 for cancer; Am-241 for smoke detectors.
No comments yet. Be the first to start the discussion!