Question 1
Which compound has a high melting point and conducts electricity when molten but not when solid?
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Chemistry · Unit 1 · Properties and structure of materials · Compounds and mixtures
the properties of ionic, metallic, and covalent compounds
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Question 2
A solid substance has a melting point of 1,083 °C, conducts electricity when molten but not when solid, and is malleable. Which type of bonding is present in this substance?
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Question 3
A student investigates three white crystalline substances labelled P, Q and R. Substance P has a melting point of 801 °C and conducts electricity when molten but not when solid. Substance Q has a melting point of 1610 °C and does not conduct electricity in either solid or molten state. Substance R has a melting point of 98 °C and does not conduct electricity in either state. Identify the bonding type in substance Q and explain why it has a very high melting point.
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