A student in a Trinidad laboratory heated sodium chloride and sugar separately. She observed that sodium chloride melted at a much higher temperature than sugar. Which statement best explains this observation?

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Question

A student in a Trinidad laboratory heated sodium chloride and sugar separately. She observed that sodium chloride melted at a much higher temperature than sugar. Which statement best explains this observation?

Accepted Answer

Sodium chloride contains ionic bonds which require more energy to break — Award 1 mark for linking ionic bonding to high melting point. A is incorrect — ionic bonds in NaCl are stronger than covalent bonds in sugar. C is incorrect — it reverses the bond types. D is incorrect — molecular mass does not directly determine melting point in this comparison.

Answer

Sodium chloride has a lower molecular mass than sugar

Answer

Sugar has stronger bonds than sodium chloride

Answer

Sodium chloride contains ionic bonds which require more energy to break

Answer

Sugar contains ionic bonds while sodium chloride contains covalent bonds

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One real Integrated Science question.
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