Why do different compounds have different properties? The table below shows data collected during an experiment for two

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Why Do Different Compounds Have Different Properties The Table Below Shows Data Collected During An Experiment For Two 1 (65.93 KiB) Viewed 36 times

Why Do Different Compounds Have Different Properties The Table Below Shows Data Collected During An Experiment For Two 2 (30.31 KiB) Viewed 36 times

Why Do Different Compounds Have Different Properties The Table Below Shows Data Collected During An Experiment For Two 3 (54.3 KiB) Viewed 36 times

Why do different compounds have different properties? The table below shows data collected during an experiment for two properties. All of the questions below are about the marked compounds. Compound Melting Point (°C) Boiling Point (C) ethanol, C,H,OH -114 +78.3 ammonia, NH -77.7 -33.3 cesium bromide, CsBr +636 +1300 hydrogen, H -259 -253 hydrogen chloride, HCI -114 -85 magnesium oxide, Mgo +2825 +3600 methane, CH, -182 -161 nitrogen, N, -210 -196 sodium chloride, Naci +801 +1465 water, H,0 0 +100 1. For the 5 circled compounds + ethanol, are they polar or nonpolar? Try to determine it on your own. You can check your answers in the Polarity and Intermolecular Forces Gizmo for the circled compounds. a. Polar molecules: b. Nonpolar molecules: 2. Range of melting points for the 6 compounds: a. What is the lowest melting point of the polar molecules? b. What is the highest melting point of the polar molecules? c. What is the highest melting point of the nonpolar molecules? d. What is the highest melting point of the nonpolar molecules? 3. Range of boiling points for the 6 compounds: a. What is the lowest boiling point of the polar molecules? b. What is the highest boiling point of the polar molecules? c. What is the highest boiling point of the nonpolar molecules? d. What is the highest boiling point of the nonpolar molecules?
3. Range of boiling points for the 6 compounds: a. What is the lowest boiling point of the polar molecules? b. What is the highest boiling point of the polar molecules? C. What is the highest boiling point of the nonpolar molecules? d. What is the highest boiling point of the nonpolar molecules? 4. When these are tested, the scientists do not test a single molecule. They test a large number of the molecules together. a. What type of intermolecular force(s) exist(s) between the polar molecules? b. What type of intermolecular force(s) exist(s) between the nonpolar molecules?
5. Making connections: a. What type of intermolecular force(s) exist(s) between molecules with low melting points? b. What type of intermolecular force(s) exist(s) between molecules with higher melting points? c. What type of intermolecular force(s) exist(s) between molecules with low boiling points? d. What type of intermolecular force(s) exist(s) between molecules with higher boiling points? 6. CHALLENGE - Inferring: Which type of intermolecular force is stronger: London dispersion or dipole-dipole? How do you know? 1 H 2.1 3 Increasing 30 4 Be 1.5 12 Mg 1.2 20 Ca 10 38 Sr 1.0 56 Ba 1.0 11 Na 0.9 19 K 0.8 37 Rb 0.8 55 Cs 07 87 Fr 0.7 1.6 21 Sc 1.3 39 Y 1.2 57 La 1.1 89 Ac 1.1 22 TI 1.5 40 ZI 1.4 72 Н! 1.3 23 V 1.6 41 Nb 1.6 73 Та 1.5 24 Cr 1.6 42 Mo 1.8 74 w 1.7 25 Mn 1.5 43 Tc 1.9 75 Re 1.9 26 Fe 1.8 44 Ru 22 76 Os 22 27 Co 1.9 45 Rh 22 77 Ir %加節阳2E 2 Decreasing 5 6 7 8 9 B C N F 20 25 30 35 40 13 14 15 16 17 ΑΙ Si Р S CI 1.5 1.8 21 25 3.0 31 32 33 34 35 Ga Ge As Se Br 1.6 1.8 20 24 28 49 50 51 52 53 In Sn Sb Te 1 1.7 1.8 1.9 21 25 81 82 83 84 85 TI Pb BI Po At 1.9 20 22 Electronegativities of the Elements 29 Cu 1.9 47 Ag 1.9 79 Au 1.9 46 Pd 22 78 S881 1.7 Hg 1.9 0.9 22 22 24 1.8 1.9 88 Ra 0.9 Difference in electronegativity Less than 02 0.2-1.7 Type of bonds Non-polar covalent Polar covalent More than 1.7 lonic