Question 12 Part A One of these liquids is much more viscous than the other. Whi

Question

Question 12 Part A One of these liquids is much more viscous than the other. Which one do you predict is more viscous? Ethylene glycol (HOCH,CH,OH) and pentana (CaH2) are both liquids at room temperature and room pressure, and have about the same molecular weight O sthylene glycol because of its strong covalent bonding O ethylene glycol because of its strong hydrogen bonding O pentane because of its strong covalent bonding O pentane because of its strong hydrogen bonding submit My Answers Give Up Part B One of these liquids has a much lawer namal boiling point (26.1 °C) compared to the other one (198 °C). Which liquid has the lower normal boiling point? Match the words in the left column to the appropriate blanks in the sentences on the right. Reset Help has the lower boiling point because it experiences intermolecular Pentane Ethylene glycol forces. weaker stronger Subunit My Answers Give Up Part C One of these liquids is the major component in antitreeze in automobile engines. Which liquid would you expect to be used as anttreeze? Match the words in the left column to the appropriate blanks in the sentences on the right. ResetHelp Ethylene glycol is used as antifreeze because it is and doesn't boll off in the very hot Pentane radiator. Viscous not viscous

Explanation / Answer

Hydrogen bond:

Part A

Ethylene glycol is more viscous than pentane because in ethylene glycol two –OH group present which form H-bonds

Substance which has the stronger intermolecular attractions so it also has greater

1. Melting point

2. Boiling point

3. Enthalpy of vaporization

Part B

ethylene glycol: - boiling point of 198 degrees Celsius

pentane: - boiling point 36.1 degrees Celcius

thus pentane has lower boiling point than ethylene glycol due to present of weak inter-molecular force.

Part C: ethylene glycol is used as antifreeze because it is viscous and does not boil off in very hot radiator  

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