Editing Answers To 2022-2023 Chem328 Review HW For Polarity, IMF And Physical Properties Including Solutions, Molarity
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Here is the answers to [[2022-2023 Chem328 Review HW for Polarity, IMF and Physical Properties including Solutions, Molarity]].<br> <br> 1a) Ionic <br> 1b) Polar <br> 1c) Non-polar <br> 1d) Polar <br> 1e) Ionic <br> 1f) Polar <br> <br> 2) Using Molecular Polarity table: *CCl<sub>4</sub>, ΔEN =0.5, 4 non-polar bonds, Tetrahedral (sym), NA, non-polar molecule, LDF<br> *<nowiki>BeCl</nowiki><sub>2</sub>, ΔEN =1.5, 2 polar bonds, Linear (sym), Yes, non-polar molecule, LDF *CS<sub>2</sub>, ΔEN=0.0, 2 non-polar bonds, Linear (sym), non-polar molecule, LDF *NF<sub>3</sub>, ΔEN=1.0, 3 polar bonds, Pyramidal (not sym), polar molecule, dipole-dipole<br> <br> <br> 3) Made mistake, no question/problem <br> <br> 4)+-->, Arrow over the more electronegative atom (or whatever way you memorize the symbol).<br> <br> 5) Ionic ΔEN> or = 1.8<br> polar bond is 1.8<ΔEN> or >0.4<br> non-polar ΔEN<=0.8<br> <br> <br> 6) Ionic compound/bond same strength as metals/metallic bonds (Highest IMF)<br> Polar molecules containing H-O,H-N,H-F (IMF name is hydrogen bonding)<br> Polar molecules that don't (IMF name is dipole-dipole interaction)<br> Non-polar molecules (IMF is London Dispersion Forces, LDF) (Lowest IMF).<br> <br> 7) Dipole-dipole interactions and Hydrogen bonding<br> <br> 8) True, (LDS are only major IMF for non-polar - non-polar molecules interaction and two substance with very large difference in molar mass (# of electrons).<br> <br> 9) No, polar or non-polar is for covalent (sharing) bonds<br> <br> 10) False<br> <br> 11) H<sub>2</sub>O<sub>1</sub> would have higher IMF since both have Hydrogen bonding IMF but H<sub>2</sub>O<sub>1</sub> has two Hydrogen bonding.<br> Ethanol (name of CH<sub>3</sub>CH<sub>2</sub>OH) has lower IMF strength so it will boil first (i.e. has lower boiling point.<br> <br> 12) Distillation is a physical separation based on boiling/boiling point. Boiling is based on CF, London dispersion forces (LDF). Octane has a higher IMF since it a higher molar meaning more electrons so more Instantaneous dipoles. So since IMF is higher, it will take more energy (higher boiling point) so boiling first means lower boiling point (Hexane). <br> <br> 13a) 2.0 mole Cl<sup>1-</sup><br> 13b) 1.0 mole Ca<sup>2+</sup><br> 13c) 3.0 mole of ions, since each Ca<sub>1</sub>Cl<sub>2</sub> (called formula unit) is actually made up of 3 ions ratio. 13d) See your notes or class notes on how dissolving ionic compound looks like in solution.<br> <br> 14a) 1.0 mole C<sub>1</sub>O<sub>1</sub> molecules. Since it is a molecular compound it base units, molecules, have all ve<sup>-</sub> being shared to group of atoms stay together as a single base unit. <br> <br> 14b) See your notes class notes on dissolving polar solute in polar solvent.<br> <br> 15) H<sub>2</sub>O<sub>1</sub> is a polar molecule and oil is a hydrocarbon (C<sub>x</sub>H<sub>y</sub>) a non-polar molecule. So H<sub>2</sub>O<sub>1</sub> exerts coloumbic force (CF) while oil does not. So H<sub>2</sub>O<sub>1</sub> molecules are interacting with other H<sub>2</sub>O<sub>1</sub> molecule so they will "push oil molecules" around so they will be together. See your figure in your notes or class notes/handouts<br> <br> 16a) unsaturated solution<br> 16b) Saturated solution<br> 16c) No more solute can be dissolved in the solution (since it is saturated) so solute creates a separate layer/phase either above saturated solution below (location of not dissolved is base on density but density has nothing to do that there is solute that be dissolved any more).<br> <br> 17a) Solvent particles have more energy so they each molecule occupies more space so there is more empty space between solvent particles.<br> <br> 17b) With more empty space between solvent particles, you put more solute (dissolve more) in solution (can see that from class note Solubility curve).<br> <br> 17c) With more empty space between solvent particles, more solute particles, that are in gas phase, can "escape" out of the solvent/solution (can see that from class note Solubility curve).<br> <br>
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