Question

Place a penny face down on the table. 1. CAREFULLY add drops of water on top...

Place a penny face down on the table. 1. CAREFULLY add drops of water on top of the penny. Your goal is to put as many drops on top of the penny without any water falling onto the table. 2. Count the number of drops that the penny was able to hold. RECORD YOUR DATA. 3. CAREFULLY add drops of alcohol on top of the penny. Your goal is to put as many drops on top of the penny without any alcohol falling onto the table. 4. Count the number of drops that the penny was able to hold. RECORD YOUR DATA.

Water: On the head side of the penny the average is 26.75.

Isopropyl Alcohol: On the head side of the penny the average is 19.

Explain the difference in the data cited above in terms of intermolecular forces.

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Answer #1

Water has strongest hydrogen bonding capacity. More hydrogen are responsible for the more hydrogen bonding and leads to stronger intermolecular forces between water molecules. That is the reason water drops will not spread easily.

Isoproply alcohol can also praticipate in the hydrogen bonding. However, because of the non polar sterically hindered isopropyl group hydrogen bonding capacity will be less than that of the water molecules, Hence, isopropy alcohol molecules will spready easily. Ultimately, number of drops you put on the top of penny will be less than the number of drop of water on the penny

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