2016 · Q23
Water at 273 K is less effective in cooling than ice at the same temperature. It is because:
general-sciencechemistry
- Awater is difficult to handle
- Bwater at 273 K has less energy than ice at the same temperature
- Cwater at 273 K has more energy than ice at the same temperature
- Dwater is not a cooling agent
Explanation
Ice at 273 K must absorb the latent heat of fusion (about 334 J/g) to melt into water at 273 K, so it extracts considerably more heat from the surroundings than water already at 273 K does. In other words, water at 273 K possesses more internal energy than ice at the same temperature. That extra energy content is why ice is the more effective cooling agent. Note: one published key gives (B), but (B) contradicts the physics of latent heat.