Medgar Evers College Of The City University of New York CES Department CHEM 202.
ID: 1083192 • Letter: M
Question
Medgar Evers College Of The City University of New York CES Department CHEM 202.060 pring 2018 Test #1 [Chapter 11] 105 pts Dr, Prince Answer all the questions. Show all calculations in the space provided. affirm that I did not have knowledge of this exam prior to taking it. I understand that only the work I submit directly to the professor at the end of the exam will be groded. f I engage in prohibited activity such as cheating, talking, leaving the examination room, or operating a cell phone during the exam, I accept that my grade for this exom will be entered os zero without question or protest. I do hereby affirm that I have read all of the directions for this exam and understand what is expected of me. Student Signature Date 1. For small molecules of comparable molecular weight, which one of the following choices lists the intermolecular forces in the order of increasing strength? (1) hydrogen bonds dip forces
Explanation / Answer
1. For small molecules of comparable molecular weight, the order of increasing bond strength will be as following
dispersion force < dipole-dipole forces < dispersion forces
the bond dissociation energy (kJ/mol) hydrogen bonding = 12-16, dipole -dipole force =0.5-2,dispersion force<1
2.the compound which show Hydrogen bonding in the liquid state is (4) NH4OH
as it contains Hydrogen attached with Electronegative Oxygen.
3. the strongest INTERMOLECULAR force of attraction between NO molecules is 1.dipole-dipole force of interaction.
NO has no hydrogen to show Hydrogen bonding. and ionic and covalent bonds are for interatomic interaction inside a molecule.
4.SUBLIMATION is that phenomenon which is not related to liquid state ..it means direct transformation of solid to gas.