Repeat the experiment for water and 1- butanol Data: Substance Molecular Molar Width Change Number Height Formula Mass of in Temp of in Drop During Drops Capillary evap. to fill Tube well H2O Water Ethanol CH3CH2OH CH3 CH2 CH2 1-Propanol OH 1-Butanol CH3 CH2 CH2CH2OH Questions Which of the substances had the drop that was least attracted to the surface? How could you tell that this was true? Which of the drops was the flattest and widest? What does this mean about the attraction of the molecule to itself relative to the surface? Which liquid had the greatest change in temperature when it was evaporating? What does this imply about the attraction of the molecules to each other? Which took the most drops to fill the well to the point it spills ? What does that mean about the size of those drops? If gravity is constant, the dropper type is the same, what does that mean about the attraction of those molecules to each other? When you compare the size of the molecules of water and Ethanol, which is bigger? How does this compare to the size of the drops? Can you determine whether the polyethylene is made of polar or non-polar molecules? The glass capillary tube contains ions, based on this fact which molecule shows the greatest Ion attraction. –Dipole Can you rank these substances from weakest intermolecular attraction to strongest intermolecular attractions and justify your answer?
Repeat the experiment for water and 1- butanol Data: Substance Molecular Formula Molar Mass Width of Drop Change in Temp During evap. Number of Drops to fill well Height in Capillary Tube Water H2O Ethanol CH3CH2OH 1-Propanol CH3 CH2 CH2 OH 1-Butanol CH3 CH2 CH2CH2OH Questions Which of the substances had the drop that was least attracted to the surface? How could you tell that this was true? Which of the drops was the flattest and widest? What does this mean about the attraction of the molecule to itself relative to the surface? Which liquid had the greatest change in temperature when it was evaporating? What does this imply about the attraction of the molecules to each other? Which took the most drops to fill the well to the point it spills ? What does that mean about the size of those drops? If gravity is constant, the dropper type is the same, what does that mean about the attraction of those molecules to each other? When you compare the size of the molecules of water and Ethanol, which is bigger? How does this compare to the size of the drops? Can you determine whether the polyethylene is made of polar or non-polar molecules? The glass capillary tube contains ions, based on this fact which molecule shows the greatest Ion –Dipole attraction. Can you rank these substances from weakest intermolecular attraction to strongest intermolecular attractions and justify your answer?