CH-484
Purity and melting point
Chemistry · Secondary 3 · Medium · Purity and melting point
Sugar (sucrose) turns brown and then black when strongly heated instead of boiling. What is the best explanation?
- Sugar decomposes on strong heating before it can reach a true boiling point.
- Sugar has an extremely high boiling point that cannot be reached in the lab.
- Sugar is an ionic solid, so it cannot melt or boil at any temperature.
- Sugar sublimes directly from solid to gas without forming a liquid.
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