Question

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

Explanation:

Step1: Analyze state at 177 °C

Since the boiling - point of water is 100.0 °C, at 177 °C water is in the gas state. In the gas state, water molecules are far apart and move freely.

Step2: Analyze state at 17 °C

Since 0.0 °C < 17 °C < 100.0 °C, water is in the liquid state at 17 °C. In the liquid state, water molecules are close together but can still move around each other.

Step3: Analyze state at - 21 °C

Since - 21 °C < 0.0 °C, water is in the solid state (ice) at - 21 °C. In the solid state, water molecules are arranged in a regular, fixed pattern.

Answer:

For 177 °C, choose the sketch with widely - spaced molecules (gas state). For 17 °C, choose the sketch with closely - packed but mobile molecules (liquid state). For - 21 °C, choose the sketch with molecules in a regular, fixed pattern (solid state).