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10
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Explain why the melting point of HF does not follow the trend of the other hydrogen halides.
HF has hydrogen bonding as its main IMF; while HCl, HBr, HI have dipole-dipole which is a generally weaker IMF than Hydrogen bonding
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10
×
State the relationship between IMF and vapor pressure
A liquid with weak intermolecular forces evaporates more easily and has a high vapor pressure.
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15
×
State the electron domain, molecular shape, bond angle/s and polarity: SO2
3, bent, 117.5, polar
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seesaw
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rocket
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fairy
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25
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lifesaver
Give 25 points!
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15
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Explain why pure carbon has a melting point of approximately 3550C while pure nitrogen has a melting point of -210C.
Carbon = giant covalent structure = strong bonding; N2 molecule = weak dispersion forces between particles = requires lesser energy to separate them
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15
×
State the electron domain, molecular shape, bond angle/s and polarity: PH3
4, trigonal pyramidal, 107, polar
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10
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Give an example of a substance that is very soluble in water and has a pyramidal shape.
(answers may vary - NH3, PH3, ...)
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star
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shark
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banana
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15
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State the electron domain, molecular shape, bond angle/s and polarity: [NH4]+
4, tetrahedral, 109.5, non-polar
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15
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Explain the following trend in boiling points: CH4 < C2H6 < C3H8
All molecules are nonpolar = only dispersion forces = increase in mass = stronger dispersion forces = higher BP
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15
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State the electron domain, molecular shape, bond angle/s and polarity: H2S
4, bent, 104.5, polar
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15
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State the electron domain, molecular shape, bond angle/s and polarity: CH2O
3, trigonal planar, 120, polar
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heart
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fairy
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25
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shark
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thief
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10
×
What does "HPLC" stand for?
High Performance Liquid Chromatography
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15
×
State the electron domain, molecular shape, bond angle/s and polarity: [CO3]2-
3, trigonal planar, 120, non-polar
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10
×
Give the two common materials used in TLC as the stationary phase
Alumina (Al2O3) and Silica (SiO2)
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