Question

Assume that you have a sample of gas at 350 K in a sealed container, as represented in part (a). Which of the drawings (b)–(d) represents the gas after the temperature is lowered from 350 K to 150 K and if the gas has a boiling point of 200 K? Which drawing represents the gas at 150 K if the gas has a boiling point of 100 K?
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Accepted Answer

Step 1: Analyze the initial conditions of the gas in the sealed container. At 350 K, the gas is represented in drawing (i), where the particles are evenly distributed throughout the container, indicating the gas phase. Step 2: Consider the first scenario where the temperature is lowered to 150 K, and the gas has a boiling point of 200 K. Since the boiling point is higher than 150 K, the gas will condense into a liquid phase. Among the drawings, (ii) represents the liquid phase with particles concentrated at the bottom of the container and some remaining in the liquid. Step 3: For the second scenario, where the temperature is lowered to 150 K and the gas has a boiling point of 100 K, the gas remains in the gaseous phase because the temperature is above its boiling point. Drawing (iv) represents the gas phase at 150 K, with particles evenly distributed throughout the container. Step 4: Understand the relationship between temperature and phase changes. When the temperature is below the boiling point, the gas condenses into a liquid. When the temperature is above the boiling point, the substance remains in the gaseous phase. Step 5: Match the visual representations to the physical states of matter. Drawing (ii) corresponds to the liquid phase at 150 K for a boiling point of 200 K, and drawing (iv) corresponds to the gaseous phase at 150 K for a boiling point of 100 K.

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Concetti chiave

Gas Behavior and Temperature

Boiling Point

Phase Diagrams