Question

Using any reference, determine which of these elements would be a liquid at 525 k (assume samples are protected from air)

Answer 1

The state of an element at 525 K depends on its pressure and the specific phase diagram. Without that information, it is impossible to determine which elements would be liquids.

Step-by-step explanation:

To determine which elements would be a liquid at 525 K, we need to refer to their phase diagrams. Each element has a unique phase diagram that shows the state of matter (solid, liquid, gas) at different temperatures and pressures. In general, an element is a liquid if its temperature and pressure fall under the liquid region of its phase diagram.

Unfortunately, without knowing the specific elements in question or their respective pressures, we cannot determine which would be in a liquid state at 525 K. Phase diagrams vary widely among elements, and the state of matter depends on both the temperature and pressure. For example, water has a melting point of 273.15 K (0°C) at 1 atmosphere of pressure and would be a liquid at 525 K under normal atmospheric conditions, but this does not apply universally to all elements.

Answer 2

The choices for this problem are bismuth, Bi; platinum, Pt; selenium, Se; calcium, Ca and copper, Cu. I think the correct answer would be selenium. The melting point of bismuth is at a temperature of 544.4 Kelvin. At a temperature of 525 K, it would exist as solid. Platinum melts at 2041.1 K. At 525 K, platinum would be in solid form. Selenium has a melting point at 494 K so that at a temperature of 525 K, it would exist in its liquid state. Calcium has a melting point of 1112 K so it would exist as solid at 525 K. Copper has a melting point at 1358 K, so it would still exist as solid at a temperature of 525 K. Therefore, the answer would only be selenium.