Lesson: Chapter 10 — Chemical Bonds

10.5. Properties of ionic and covalent compounds 4 of 10 Reset answers

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Question 4

A compound melts at −73 °C and boils at −10 °C. What is its bonding most likely to be?

A Covalent B It must be a metal C There is no way to tell from a melting point D Ionic

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Covalent. Melting and boiling points this low mean that only weak attractions between separate molecules had to be overcome.

An ionic compound would melt in the hundreds of degrees, because a whole lattice of strong attractions must break down. These figures are in fact those of sulfur dioxide.

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