IB HL Intermolecular Forces | Baamboozle - Baamboozle

English 30 Public

Intermolecular Forces, Shapes of Molecules, VSEPR

Study Slideshow

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

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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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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

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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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State the electron domain, molecular shape, bond angle/s and polarity: CH4

4, tetrahedral, 109.5, non-polar

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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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State the electron domain, molecular shape, bond angle/s and polarity: PH3

4, trigonal pyramidal, 107, polar

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State the electron domain, molecular shape, bond angle/s and polarity: BF3

3, trigonal planar, 120, non-polar

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State the electron domain, molecular shape, bond angle/s and polarity: BeI2

2, linear, 180, non-polar

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State the electron domain, molecular shape, bond angle/s and polarity: SO3

3, trigonal planar, 120, non-polar

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State the electron domain, molecular shape, bond angle/s and polarity: SO2

3, bent, 117.5, polar

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State the electron domain, molecular shape, bond angle/s and polarity: HCN

2, linear, 180, polar

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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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State the electron domain, molecular shape, bond angle/s and polarity: [CO3]2-

3, trigonal planar, 120, non-polar

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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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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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