The diagram shows the interconversion of water in its three different states.

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The question asks in which conversions the water molecules will lose speed. Molecules lose speed when they lose kinetic energy. This occurs during exothermic phase changes, where energy is released from the substance.

Identify the phase changes represented by each arrow.
- Arrow 1: Ice $\to$ Water (Melting) - Molecules gain energy/speed.
- Arrow 2: Water $\to$ Steam (Evaporation/Boiling) - Molecules gain energy/speed.
- Arrow 3: Ice $\to$ Steam (Sublimation) - Molecules gain energy/speed.
- Arrow 4: Water $\to$ Ice (Freezing) - Molecules lose energy/speed.
- Arrow 5: Steam $\to$ Water (Condensation) - Molecules lose energy/speed.
- Arrow 6: Steam $\to$ Ice (Deposition) - Molecules lose energy/speed.
Determine which conversions involve molecules losing speed.
Molecules lose speed during phase changes that release energy (exothermic processes). These are:
- Freezing (Water to Ice), represented by arrow 4.
- Condensation (Steam to Water), represented by arrow 5.
- Deposition (Steam to Ice), represented by arrow 6.
Select the option that lists these conversions.
The conversions where water molecules lose speed are 4, 5, and 6. Based on the options provided in the image, option D corresponds to these conversions.

The final answer is $\text{D}$ .

The diagram shows the interconversion of water in its three different states.

Answer

Step-by-step solution

Identify the phase changes represented by each arrow.

Determine which conversions involve molecules losing speed.

Select the option that lists these conversions.

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