new Page 3 CHEM 1112 between water molecules, between water molecules and Table
ID: 1088309 • Letter: N
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new Page 3 CHEM 1112 between water molecules, between water molecules and Table 2. Your team misrltit lethis table, l-t Solvent TSC c other hydrogen bonding molecules, or between other hydrogen bonding molecules: matharol b.1 263 20.2 etrool 14.11 2277-5 Harol 18.2 22543 Data Anaysis a) Calculate the change in temperature, AT, using T- T. Record these values in Table 3 b) Give the table a title that describes the data it Key Questions 11. What are the restrictions on which molecules can contains. hydrogen bond? Key Questions 8. Did the results support the hypotheses your team 12. Which of the solvents used in this laboratory can made in Questions 5 and 6? If your differed from the observations, how did they differ? rom the observations, how did they differ? exhibit hydrogen bonding? Why?22.4 Model -Dipole-Dipole Forces Molecules which contain atoms having si electronegativity differences 0.5) and having a shape that does not cause its bond dipoles to cancel out, will 9. Which solvent showed the strongest intermolecular interactions? Which showed the least? Information - van der Waals Forces There are several types of intermolecular interactions. exhibit dipole-dipole intermolecular The interactions that hold liquids and solids together are collectively called van der Waals forces. These forces Key Questions include dipole-dipole interactions, dipole-induced dipole interactions, dispersion forces and hydrogen bonding. Depending on the structure, molecules can have several of the different types of interactions occur Model-London Dispersion Forces simultaneously with other molecules. force interactions. 13. Which of the solvents used in this laboratory can exhibit dipole-dipole intermolecular force interactions? Why? London dispersion forces are another type of van der Waals force that occur in all types of atoms, molecules Key Question 10. What is the main difference in a polar molecule and and ions. The reason is that all atoms, molecules and a nonpolar molecule? ions have negative electrons that are orbiting about nuclei containing positive protons. Since the electrons are in constant motion, they can sometimes have a Model-Hydrogen Bonding There is a special type of van der Waals force which greater density on one side of the atom, molecule, or onh occurs between a hydrogen atom covalently boned lon to either N, O, or F and another N, O, F atom which is covalently bonded to another hydrogen atom. For The formation of an instantaneous dipole can also cau example, in water, hydrogen bonding can occur other nearby atoms or molecules to form complimentary instantaneous dipoles. Formation andExplanation / Answer
9.Methanol will be most polar and butanol will be least.as the number of CH2 groups increase polarity decrease.
10.Polar molcule is formed when two atoms having large differance in electro negativity is bonded.This type of molecule will have intermolecular force of attraction greater.
11.When hydrogen is attached to a highly electro negative atom like O or F,hydrogen will get aslight + charge and Oor F ,a slight negative charge due to shifting of bonded electrons. This is the cause of hydrogen bond.
12.Lower alcohols,aldehydes and ketones, water
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