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Intermolecular Forces
Game Code: 528816
English
25
Public
Intermolecular Forces, Shapes of Molecules, VSEPR
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Explain why HCl is more soluble in water than Cl2.
HCl is a polar molecule (forms ion-dipole interaction with water) while Cl2 is non polar
10
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
10
Why is the melting point of HI higher than HBr?
HI has greater molar mass (more electrons) and so it has stronger dispersion forces than HBr
10
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
15
State the electron domain, molecular shape, bond angle/s and polarity: CH4
4, tetrahedral, 109.5, non-polar
15
State the electron domain, molecular shape, bond angle/s and polarity: H2S
4, bent, 104.5, polar
15
State the electron domain, molecular shape, bond angle/s and polarity: PH3
4, trigonal pyramidal, 107, polar
15
State the electron domain, molecular shape, bond angle/s and polarity: BF3
3, trigonal planar, 120, non-polar
15
State the electron domain, molecular shape, bond angle/s and polarity: BeI2
2, linear, 180, non-polar
15
State the electron domain, molecular shape, bond angle/s and polarity: SO3
3, trigonal planar, 120, non-polar
15
State the electron domain, molecular shape, bond angle/s and polarity: SO2
3, bent, 117.5, polar
15
State the electron domain, molecular shape, bond angle/s and polarity: HCN
2, linear, 180, polar
15
State the electron domain, molecular shape, bond angle/s and polarity: [NH4]+
4, tetrahedral, 109.5, non-polar
15
State the electron domain, molecular shape, bond angle/s and polarity: [CO3]2-
3, trigonal planar, 120, non-polar
15
State the electron domain, molecular shape, bond angle/s and polarity: CH2O
3, trigonal planar, 120, polar
15
Give an example of a substance that is very soluble in water and has a pyramidal shape.
(answers may vary - NH3, PH3, ...)
10
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