Given in the table the molecular mass and dipole moment of the five compounds, which should have the highest boiling point? Dipole moment (D) Substance Molecular mass (g/mol) Propane 44 0.1 Dimethylether 46 1.3 Methylchloride 50 1.9 Acetonitrile 41 3.9 O Methylchloride O Acetonitrile O Propane O Dimethylether

Select the compound that will have the lower equilibrium vapor pressure based on predicted intermolecular forces. pentane (C5H12) phosphorus tribromide

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Complete the following data table. AT (°C) 10.47 Compound Water 19.063 Methanol 15 Ethanol 7.94 10.56 5.3 22.315 1- Propanol 2- Propanol 1- Butanol Acetone Discussion: 1. Draw a Lewis structure for each of the molecules used in this experiment. (Be sure to show nonbonding electrons.) stv Aa MacBook Air DD DD F3 F4 F5 F6 EZ F8 F9 F10 F11 %23 2$ へ & 4. 6. 7 E T Y U G H. K L C V B * CO LL

v ints. That is, choose 1 next to the substance with the highest boiling Rank the elements or compounds in the table (Choose one) point, choose 2 next to the substance with th 1 (highest) chemical symbol, substance chemical formula or Lewis structure H : 4 (lowest) H C C N C H (Choose one) A H. H H :NEN 0: (Choose one) В H :0: H. |I . I (Choose one) C Н—С — С - О- С — Н .. H H. F2 (Choose one)

For each compound in the table below, decide whether there would be any hydrogen-bonding force between molecules of the compound, or between molecules of the compound and molecules of water. name N-chloromethylamine methanimine compound bromomethane formula or Lewis structure H | H-C H H | - CI: H | H-C=N-H CH₂ Br Between molecules of the compound? O O ΟΟ yes no yes no yes hydrogen-bonding force no Between molecules of the compound and molecules of water? O O ОО yes no yes no yes no X 5

Yellow Food Dye Water OH HO OH HO OH HO HH HO. e OH Analysis Question 2: What type of attractions occur between the dye and the water based on their molecular structures?

For each compound in the table below, decide whether there would be any hydrogen-bonding force between molecules of the compound, or between molecules of the compound and molecules of water. compound hydrogen-bonding force formula or Lewis Between Between molecules of 圖 name molecules of the the compound and molecules of water? structure compound? H O yes O yes methanimine H-C=N-H О по О по H O yes O no dimethyl ether H -C C - H O yes O no O yes O no O yes O no hypochlorous acid HCIO

CONCLUSIONS: In general, the boiling points of compounds increase down a group in the periodic table. The melting points and boiling points for the hydrogen compounds of group 6A elements are in the table below. Melting Point (°C) Boiling Point (°C) H₂O 0.0 100.0 H₂S -82.0 -60.0 H₂Se -65.7 -41.2 H₂Te -49.0 -2.2 Use your understanding of chemistry to propose an explanation for the anomaly in the trend for the hydrogen compounds of group 6A elements shown in the table.

There are five pure substances. The molecular component is shown per substance. Based on this information, answer items 56 to 65. Substance Molecular Component Substance Molecular Component O Substance A Substance D Substance B Substance E Substance C OH 56. The physical properties of the substances are influenced by intermolecular forces of attraction. Which substance(s) are predominantly influenced by the intermolecular association of the molecules via hydrogen bonding? A. Substance A only B. Substance A and C C. Substance A, B, and C D. Substance A, B, C, and D 57. Which substance is expected to turn blue litmus paper into red color? A. Substance A B. Substance B C. Substance C D. Substance D OH H