Questions: Measurement and Matter Distinguishing solid, liquid and gas phases of a pure substance There are three sets of sketches below, showing the same pure molecular compound (water, molecular formula H2O) at three different temperatures. The sketches are drawn as if a sample of water were under a microscope so powerful that individual atoms could be seen. Only one sketch in each set is correct. Use the slider to choose the correct sketch in each set. You may need the following information: melting point of H2O: 0.0°C boiling point of H2O: 100.0°C

Measurement and Matter Distinguishing solid, liquid and gas phases of a pure substance There are three sets of sketches below, showing the same pure molecular compound (water, molecular formula H2O) at three different temperatures. The sketches are drawn as if a sample of water were under a microscope so powerful that individual atoms could be seen. Only one sketch in each set is correct. Use the slider to choose the correct sketch in each set. You may need the following information: melting point of H2O: 0.0°C boiling point of H2O: 100.0°C
Transcript text: Measurement and Matter Distinguishing solid, liquid and gas phases of a pure substance There are three sets of sketches below, showing the same pure molecular compound (water, molecular formula $\mathrm{H}_{2} \mathrm{O}$ ) at three different temperatures. The sketches are drawn as if a sample of water were under a microscope so powerful that individual atoms could be seen. Only one sketch in each set is correct. Use the slider to choose the correct sketch in each set. You may need the following information: \[ \begin{array}{l} \text { melting point of } \mathrm{H}_{2} \mathrm{O}: \quad 0.0^{\circ} \mathrm{C} \\ \text { boiling point of } \mathrm{H}_{2} \mathrm{O}: 100.0^{\circ} \mathrm{C} \end{array} \]
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Solution

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Solution Steps

Step 1: Analyze the information given

The melting point of water is 0.0 °C and the boiling point is 100.0 °C. We are given three temperatures: 42 °C, -21 °C, and 273 °C. We need to determine the state of water at each temperature.

Step 2: Determine the state of water at 42 °C

42 °C is above the melting point (0 °C) and below the boiling point (100 °C), so the water is in a liquid state. Liquid particles are close together but can move past one another. Select slider position 2 for A.

Step 3: Determine the state of water at -21 °C

-21 °C is below the melting point of water, so the water is in a solid state (ice). Solid particles are tightly packed in a fixed arrangement. Select slider position 1 for B.

Final Answer:

A: 2, B: 1, C: 5

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