Chapter 13 Chemistry Homework

Chapter 13 – Answers to Questions 13.2 The Intermolecular Force Concept (IMF) intermolecular force – Attraction between molecules that hold molecules together in liquids and solids. These are always weaker than covalent bonds! 1) Dispersion (also called London) Force – A temporary dipole attraction between molecules due to shifting electrons. ⇒ Only type of IMF for nonpolar molecules. 2) Dipole –dipole force – A permanent dipole force exists between polar molecules. ⇒ Only polar molecules can form dipole-dipole forces! 3) Hydrogen Bond – An especially strong dipole force exists between molecules containing H-F, H-O or H-N bonds. ⇒ Strongest type of IMF between molecules Example. Indicate the strongest type of intermolecular force (Dispersion, Dipole-Dipole or Hydrogen bond) between the molecules in the following: Polar or Nonpolar? Strongest Intermolecular Force A. CCl 4 Nonpolar Dispersion (or London) B. NH 3 Polar H bond C. HCl Polar Dipole D. OF 2 Polar Dipole Example. Choose the bond or attraction described for each below:

Chapter 13 homework answers 1 of 6 CHM 130: Chapter 13 Homework Answers1) Check all of the examples below that are properties of liquids: b) Indefinite shape but a fixed volume c) Flow readily e) Cannot expand or compress f) If miscible, can mix uniformly to form a homogeneous mixture 2) Check all of the examples below that are properties of solids: a) Definite shape and fixed volume e) Cannot expand or compress g) Lacks the energy to mix, so cannot mix by diffusion h) Can be crystalline or noncrystalline 3) Intermolecular forces or bonds exist between _____________. d) two different molecules 4) Check all of the following that are types of intermolecular forces: d) Hydrogen bond e) Induced dipole (dispersion or London) forces f) Dipole forces ExplanationIntermolecular forces refer to the attraction between two different molecules. The types of intermolecular forces are: Hydrogen bond, Induced dipole (dispersion or London) forces , and Dipole forces The other choices (ionic bond, polar covalent bond, and nonpolar covalent bond) are all intramolecular forcesthat exist between two ions or atoms within a compound. 5) The attractions between nonpolar molecules in liquids or solids that are temporary dipoles known as ____________. c) induced dipole (dispersion or London) forces ExplanationThe attractions between nonpolar molecules in liquids or solids are temporary dipoles known as induced dipole (dispersion or London) forces . 6) The attraction between polar molecules in liquids or solids that do not contain a H-F, H-O, or H-N bond is known as _______________________. d) dipole forces ExplanationThe attraction between polar molecules in liquids or solids is known as dipole forces . 7) The strongest attraction between polar molecules in liquids or solids that contain a H-F, H-O, or H-N bond is known as ____________. e) hydrogen bonds ExplanationThe strongest attraction between polar molecules in liquids or solids that contain a H-F, H-O, or H-N bond is known as hydrogen bonds . 8) Check all of the examples below that are polar: a) HF d) NO f) CO h) H2O

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