Hello, could you please go over problems # 8, 9, 14, 15, and 27? Chemistry 1220
ID: 587181 • Letter: H
Question
Hello, could you please go over problems # 8, 9, 14, 15, and 27?
Chemistry 1220 Recitation Activity 12 25. Based on the following information, which compound has the strongest intermolecular forces? AHyap (kJ/mol) Substance Argon (Ar) Benzene (C6H6) Ethanol (C2HsOH) Water (H20) Methane (CH4) 6.3 31.0 39.3 40.8 9.2 A) Argon B) Benzene C) Ethanol D) Water E) Methane 26. Large intermolecular forces in a substance are manifested by A) low vapor pressure B) high boiling point C) high heats of fusion and vaporization D) high critical temperatures and pressures E all of the above 27. A supercritical fluid can expand like ato fill a container and has a density similar to that of a so can behave as a solvent. A) gas, plasma B) gas, solid C) solid, gas D) liquid, gas E) gas, liquid 28. The critical temperature and pressure of CS2 are 279 °C and 78 atm, respectively. A supercritical fluid can only exist at a temperature_bove. 279 °C and pressure_absve 78 atm. A) exactly, exactly B) above, below C)above, above D) below, above E) below, belowExplanation / Answer
Q8) Option B
Argon has only disperion forces as intermolecular forces of attraction.
The others CH3CH2OH, NH3 and H2O have H-bonding, dipole dipole interactions along with London forces.
HBr has dipoledipole interactions along with london forces.
Q9)OPtion C
CH3OH , methanol has predominant Hydrogen bonding as it contains the H on the electronegative O atom.
Other compounds do not have any H atom on the electronegative atoms, thus dont have H -bonding.
Q14) Option d
Only CH3CH3 has predominant London forces only. all the others have polar bonds with H on more elctronegative O or N, thus show H- bonds als.
Q15)Option E
NH3 is a polar molecule,has intermolecular H- bonding with H on electronegative N, capable of forming H- bonds.
PO4-3 ion has electronegative O atoms with negative charg.
Thus the forces that operate between these are
London dispersion forces, ion-dipole forces (between NH3 and phosphate ) dipole-dipole between NH3 molecules and H- bonding between NH3 -Nh3 and NH3 -PO4-3 ions.
Q27) Optiion E
A super critical fluid is a liquid above its critical temperature.
Thus it is a liquid with the properties that of gas.
Thus it occupies all the volume of container like a gas, shows the density of liquid so that it is used as a liquid solvent.
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