List the following elements in order from lowest boiling point to highest lowest boiling point Aluminum iodi Fructose C6H Potassium bra Calcium brom highest boiling point
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- Are changes in state physical or chemical changes? Explain. What type of forces must be overcome to melt or vaporize a substance (are these forces intramolecular or intermolecular)? Define the molar heat of fusion and molar heat of vaporization. Why is the molar heat of vaporization of water so much larger than its molar heat of fusion? Why does the boiling point of a liquid vary with altitude?Aspirin has a higher molar mass compared to salicylic acid, however aspirin melts at a lower temperature than salicylic acid. Provide a brief explanation for this observation. Table 1 Compound: Formula: Salicylic Acid C;H6O3 Aspirin C9H3O4 Molar Mass: 138.12 Melting point: Ka 158-160°C 1.08 x 10³ 180.15 140-142°C 2.72 x 10$ pKa Solubility (g/100ML) 2.99 4.57 0.18 0.25Select the compound that will have the higher equilibrium vapor pressure based on predicted intermolecular forces. pentane (C5H12) iodine pentafluoride
- Select the compound that will have the lower equilibrium vapor pressure based on predicted intermolecular forces. pentane (C5H12) phosphorus tribromideWhich of the following compounds has the highest vapor pressure at 25°C? O acetic acid, boiling point- 118 C carbon tetrachloride, boiling point = 76.7 C Omethanol, boiling point- 65.0 C O pentane, boiling point = 36.1 C O ethanol, boiling point= 78.7 CThe boiling point of benzene is 80°C. Which pair of samples will have the same average kinetic energy as benzene molecules? O two samples of liquid benzene, one at 70°C and the other at 80°C O a sample of liquid benzene at 80°C and a sample of gaseous benzene at 80°C O a sample of liquid benzene at 70°C and a sample of gaseous benzene at 90°C O two samples of gaseous benzene, one at 80°C and the other at 90°C
- The following information is given for ethanol at 1 atm: Boiling point = 78.40°C Heat of vaporization = 200.0 cal/g Melting point = –114.5°C Heat of fusion = 26.04 cal/g Specific heat gas = 0.3418 cal/g°C Specific heat liquid = 0.5880 cal/g°C A 22.80 g sample of liquid ethanol is initially at –68.20°C. How many kcal of energy must be added to the sample to raise its temperature to 94.20°C? Energy added = kcalChoose the substance with the highest boiling point and explain why you choose it -NaCl -H2O -O3 -CH4Arrange the following substances in order of increasing total intermolecular forces between their molecules. ○ | < 1 < ||| OI< | < | ○ | < | < 1 O # < 1< || O | < | < 1 Ol< | < | I OH 11 111 OH
- Consider the melting points of the substances below (see figures for two compounds). Explain the trend in melting point using your knowledge of intermolecular forces. (In the structures below, carbon is black, hydrogen is white, and oxygen is red.) Substance Melting Point (°C) Molar Mass (g/mol) Cl2 −102 71 Ethyl formate (CH3CH2OCHO) −80 74 Propionic acid (CH3CH2COOH) −20 74 Br2 −7.2 160Rank the elements or compounds in the table below in decreasing order of their boiling points. That is, choose 1 next to the substance with the highest boiling point, choose 2 next to the substance with the next highest boiling point, and so on. chemical symbol, substance chemical formula boiling point or Lewis structure A CO |(Choose one) O2 |(Choose one) ♥ В H H .. Н — О — C H. |(Choose one) v C - | H H Al, O, |(Choose one) ? :0 :Which of the following has the highest boiling point? Je Cl OH