8.1 Pure substances — Visual & Photo Quiz

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Questions count: 1
Passing grade: B+

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Look at the heating curve graph comparing pure water with salt water (impure water). How does the melting/boiling behavior of a pure substance differ from a mixture?

A pure substance melts and boils at a single, sharp, fixed temperature, whereas an impure mixture melts and boils over a range of temperatures

A pure substance never boils

Impure water boils at a lower temperature than pure water at sea level

Both pure and impure water have completely identical boiling curves