Question

a, b, and c

find a means to watch the following YouTube video sound is not necessary: https://youtu.be/ICp6tkyThe The video demonstrates the behavior of three liquids: water, glycerin, and alcohol Answer the following questions about the video Batween the time of 0:20 - 2820 of the video, write down your observations about the relative ih of the surface tension of these three liquids. Based on this evidence alone, rank these three strength of the e from strongest to weakest in terms of intermolecular forces and share your reasoning for this liquids from strong ranking. b) Retween 2:20 - 6:15 on the video, write down your observations about the rate of evaporation of each of these liquids. Based on this evidence alone, rank each liquid from lowest to highest in terms of vapor pressure, Share your reasoning for this ranking. b2.) What is the relationship between vapor pressure, boiling point, and intermolecular forces? c.) From 6:15-8:20 in the video, oil is mixed with water, glycerin, and alcohol. Based upon the concept of "like dissolves like," which compounds had "like" intermolecular forces compared to the oil? Explain your reasoning.

Answer 1

a) The strongest intermolecular interactions seem to be from glycerin, then from water and finally from alcohol. Glycerin contains three hydroxyl groups while water has two hydrogen atoms and alcohol just one hydroxyl, this allows more hydrogen bondings in glycerine -thus increasing interactions- than in water or alcohol.

b) The vapor pressure follows the same tendency as the last test. The vapour pressure increases from glycerin to alcohol.

b2) With stronger Intermolecular forces , vapor pressure decreases so,  the boiling boint is increased.

c) The alcohol can dissolve a little amount of oil, this implies that their molecular forces are comparable, alcohol is the least polar compound.