How does the density of copper at its melting point of 1,356 K compare to that of copper at room temperature, 293 K? Its linear expansion coefficient is 17.0 x 10⁻⁶ K⁻¹. A) 1.054 times as large B) 1.018 times as large C) 0.949 times as large D) 0.982 times as large E) 0.946 times as large

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Quizplus · Accepted Answer

The density of a material decreases as it expands. Using the linear expansion coefficient, the volume change can be calculated, and thus the density change. The density at the melting point is approximately 0.946 times that at room temperature.

How Does the Density of Copper at Its Melting Point