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From Dr. Lavelle's most recent lecture, we can determine how viscous a substance is compared to another by analyzing their IMFs. The stronger IMF's something has, the more viscous it will be.
Another tip with viscosity is to compare water and syrup ( I feel that real examples help more). Water of course flows more easily, but syrup has a thicker consistency so it doesn’t flow as smoothly. Syrup is thus more viscous.
Without doing an experiment, you can compare viscosities by looking at the IMF's of the substances. If a substance has high IMF's they will be closer together and more viscous. If it has low IMF's, the molecules won't be as attracted to each other and farther apart, so it will be less viscous.
Liquids that flow slowly have high viscosities and liquids that flow readily have low viscosities. Liquids whose molecules are polar are usually more viscous than similar nonpolar substances. Liquids with long molecules are invariably very viscous. The viscosity of a liquid decreases as temperature increases.
Conceptually, you can determine how high a liquid viscosity is by noticing how easily the substance moves. If it moves slower, you know it has a higher viscosity compared to something that moves relatively easy, like water.
Yeah I think a general rule is stronger IM forces= higher viscosity. I kind of think of it as the fact that stronger IM forces means that the liquid is closer to being solid and viscous liquids are quite thick and close to solid.
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