State the electron domain, molecular shape, bond angle/s and polarity: H2S
4, bent, 104.5, polar
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10
In paper chromatography, why do we use pencil instead of pen in writing the starting line?
pencil = insoluble in solvent; pen = soluble; may interfere with the results
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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: BF3
3, trigonal planar, 120, non-polar
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If a molecule has 4 bonds and one lone pair, what is its shape?
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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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10
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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Which of the following has the shortest bond
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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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Which would have the highest Rf?
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Explain why polar molecules are often soluble in water while non-polar molecules are not. Include discussion on the intermolecular processes involved in dissolving.
soluble = IMF solute and IMF solvent are similar; water is polar = h-bonding and dipole dipole; nonpolar solute = dispersion (way weaker than IMF in solvent)
