State the electron domain, molecular shape, bond angle/s and polarity: PH3
4, trigonal pyramidal, 107, polar
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10
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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10
Give an example of a substance that has a very high 1st ionization energy, a very low BP and does not form bonds.
(answers may vary - any noble gas)
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15
State the electron domain, molecular shape, bond angle/s and polarity: BeI2
2, linear, 180, non-polar
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15
Explain why CO is polar while CO2 is nonpolar.
O is more EN than C; CO has uneven distribution of e in bond, thus polar; CO2 is linear (symmetrical), charge distribution is even, thus non-polar
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15
State the electron domain, molecular shape, bond angle/s and polarity: BF3
3, trigonal planar, 120, non-polar
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15
State the electron domain, molecular shape, bond angle/s and polarity: CH4
4, tetrahedral, 109.5, non-polar
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10
What element combines with another element by sharing 1 pair of valence e and combines with hydrogen to form a molecule that exhibits hydrogen bonding?
Fluorine
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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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thief
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5
10
15
20
25
rocket
Go to first place!
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fairy
Take points!
5
10
15
20
25
lifesaver
Give 20 points!
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15
State the electron domain, molecular shape, bond angle/s and polarity: HCN
2, linear, 180, 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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15
State the electron domain, molecular shape, bond angle/s and polarity: SO3
3, trigonal planar, 120, non-polar
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15
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
