Pure gold is described as 24 carat gold and is considered too soft for making jewellery. Explain why it is alloyed and what 22 carat gold means. Also state one general effect alloying has on the electrical conductivity and melting point of a pure metal.
Generated by claude-sonnet-4-6 · 2026-06-26 01:05 · grounding rag
Model Answer
Pure gold (24 carat) is too soft for jewellery, so it is alloyed with metals like copper or silver to make it harder and more durable.
22 carat gold means that out of 24 parts of the alloy, 22 parts are pure gold and 2 parts are other metals (such as copper or silver).
Effect of alloying on a pure metal:
- Electrical conductivity decreases — alloying reduces the conductivity of the pure metal.
- Melting point changes (generally decreases) compared to the pure metal.
Explanation
- The question has three clear parts: (i) why gold is alloyed, (ii) meaning of 22 carat, and (iii) one general effect on conductivity AND melting point (the question says "one general effect" but lists two properties — address both briefly).
- Remember: an alloy is a homogeneous mixture, not a compound. Alloying improves hardness/strength but reduces electrical conductivity and often lowers melting point.
- 22 carat = 22/24 parts gold — state this as a fraction out of 24 to make it clear.