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non li con cars Melting Points Pre-Lab Questions 1. List four intermolecular attractive forces that play a role in the properties of a compound, (1 pt) London Attractive Forces, Dipole Pipole,Hydrogen bonding in mala (1 pt) 2. List the intermolecular attractive forces present in: a) CH dispersion b) CHCH:CH Hydrogen bonding dispersion Which of the two would have the higher melting point and why? Due to the hydrogen bondind CH CHOH will have the higher melting pant 3. Give three reasons for determining melting points. (I pt) of compondo a known one, then the melting point will help to characterizz future of compound is now, then the melting point is recorded to allow characterization range of melting point is indicative of the purity of compound - an impure compound welt Melt over a wide range of temp 4. A property of a solution that depends only on the number of dissolved particles, not on their chemical identity is called a property. (1 pt) a) collective b) colligative c) concentration d) collaborative e) condensed 5. If I am determining the melting point of a sample that contains a soluble impurity in it, what would the effect of the impurity be on the melting point? (1 pt) a) The impure sample would melt at a higher temperature than for the pure sample. b) The impure sample would melt at a lower temperature than for the pure sample. c) The impure sample would melt at a higher or lower temperature, but it could not be predicted which d) There would be no effect on the melting point. 6. If I purified the substance in question #5. what two things would I observe happen to the melting point as compared to when it was impure? (1 pt) 7. Which of the melting point capillaries in the picture below is filled to the proper level for taking a melting point? (ruler is in millimeters) (1 pt) 12 d) tube d e) all of the tubes are fine c) tubec a) tube a b) tube b 8. What would you observe if your compound sublimes rather than melts? (1 pt) 0 9. What is the most critical factor in determining an accurate melting point for a substance? (1 pt) ea 0 e 10. You have a sample that you are sure is Substance A, which has a listed melting range of 145-146 C. You run your sample and observe a melting range of 145-151 C. Is your sample impure, or did you heat too fast? Explain. (1 pt) 3 EF SF le non li con cars Melting Points Pre-Lab Questions 1. List four intermolecular attractive forces that play a role in the properties of a compound, (1 pt) London Attractive Forces, Dipole Pipole,Hydrogen bonding in mala (1 pt) 2. List the intermolecular attractive forces present in: a) CH dispersion b) CHCH:CH Hydrogen bonding dispersion Which of the two would have the higher melting point and why? Due to the hydrogen bondind CH CHOH will have the higher melting pant 3. Give three reasons for determining melting points. (I pt) of compondo a known one, then the melting point will help to characterizz future of compound is now, then the melting point is recorded to allow characterization range of melting point is indicative of the purity of compound - an impure compound welt Melt over a wide range of temp 4. A property of a solution that depends only on the number of dissolved particles, not on their chemical identity is called a property. (1 pt) a) collective b) colligative c) concentration d) collaborative e) condensed 5. If I am determining the melting point of a sample that contains a soluble impurity in it, what would the effect of the impurity be on the melting point? (1 pt) a) The impure sample would melt at a higher temperature than for the pure sample. b) The impure sample would melt at a lower temperature than for the pure sample. c) The impure sample would melt at a higher or lower temperature, but it could not be predicted which d) There would be no effect on the melting point. 6. If I purified the substance in question #5. what two things would I observe happen to the melting point as compared to when it was impure? (1 pt) 7. Which of the melting point capillaries in the picture below is filled to the proper level for taking a melting point? (ruler is in millimeters) (1 pt) 12 d) tube d e) all of the tubes are fine c) tubec a) tube a b) tube b 8. What would you observe if your compound sublimes rather than melts? (1 pt) 0 9. What is the most critical factor in determining an accurate melting point for a substance? (1 pt) ea 0 e 10. You have a sample that you are sure is Substance A, which has a listed melting range of 145-146 C. You run your sample and observe a melting range of 145-151 C. Is your sample impure, or did you heat too fast? Explain. (1 pt) 3 EF SF le