The correct option is A: the fresh-water pond because it has a lower density.
Surface tension is the property of the surface of a liquid that allows it to resist external forces. It is mainly determined by the cohesive forces between the liquid molecules. In general, surface tension is directly related to the intermolecular forces and inversely related to the density of the liquid.
Freshwater has a lower density compared to saltwater. Due to the lower density, the intermolecular forces between the water molecules in the freshwater pond are stronger, resulting in higher surface tension. Therefore, if measured, the fresh-water pond would have a higher surface tension.
You are comparing the surface tension on two bodies of water: a fresh-water pond and a salt-water lagoon. Which one, if measured, would have a higher surface tension?
A: the fresh-water pond because it has a lower density
B: the salt-water pond because it has a higher density
C: the fresh-water pond because is has a lower pH
D: the salt-water pond because it has a higher pH
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