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The surface tension and viscosity of water at several different temperatures are given in this table.(a) As temperature increases, what happens to the surface tension of water? Explain why this occurs, in terms of molecular interactions and the effect of changing temperature.(b) As temperature increases, what happens to the viscosity of water? Explain why this occurs, in terms of molecular interactions and the effect of changing temperature.
a) The molecules of water are strongly attracted to each other because of the hydrogen bonding. As hydrogen bonding is very strong intermolecular force of attraction, therefore water exhibit relatively high surface tension. Temperature raises the kinetic energy of the molecules that enable them to move away from each other by overcoming the hydrogen bonding. Therefore, the surface tension of water decreases with increase in temperature.b) The molecules of water are strongly attracted to each other because of the hydrogen bonding as it is very strong intermolecular force of attraction. Hydrogen bonding between water molecules is responsible for viscosity of water. Temperature raises the kinetic energy of the molecules that enable them to move away from each other by overcoming the hydrogen bonding. Therefore, the viscosity of water decreases with increase in temperature.
01:24
Aadit S.
Chemistry 102
Chapter 10
Liquids and Solids
Liquids
Solids
University of Central Florida
University of Maryland - University College
University of Kentucky
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going to look at into molecular forces between molecules, for example, and are liquids. And so we have two different parts to this podcast. We can take a look at the first part here, so the molecules of our water will be strongly attracted to one another because we have hydrogen bonding. So because hydrogen bonding is a very strong into molecular force, we see ah, high surface tension. What's office tension is abbreviated S t. And so as the temperature increases, we increase kinetic energy as well. On dso are molecules move farther away from one another as we overcome into molecular forces to reduce the viscosity on what we also see is a decrease in surface tension. So we have a second part to consider. So the molecules of water are strongly attracted to each other because of this hydrogen bonding where the hydrogen bonding between water molecules is responsible for the viscosity of water. So if we if we have a temperature increase, then we have a kinetic energy increase so we can overcome into molecular forces and therefore the viscosity of the water decreases, just like surface tension decreases
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