CHEM 101 Unit 3 Progress Check: MCQ questions and answers

Which particle diagram shown above best represents the strongest intermolecular force between two ethanol, , molecules? A Diagram 1, because it shows hydrogen bonds forming between hydrogen atoms from different ethanol molecules. B Diagram 1, because it shows strong, directional dipole-dipole forces between two polar ethanol molecules. C Diagram 2, because it shows the formation of a hydrogen bond between an atom bonded to an atom with an atom from another molecule. D Diagram 2, because it shows the dipole from an ethanol molecule inducing a dipole in another ethanol molecule. 2. The diagram above represents four cations, all shown to the same scale. Which cation would be predicted by Coulomb’s law to have the strongest ion-dipole attraction to water, and why? AP Chemistry Scoring Guide Unit 3 Progress Check: MCQ Copyright © 2017. The College Board. These materials are part of a College Board program. Use or distribution of these materials online or in print beyond your school’s participation in the program is prohibited. Page 2 of 27 A , because it is the smallest group 1 metal ion. B , because it has the largest charge-to-size ratio. C , because it has the smallest charge-to-size ratio. D , because it is the largest group 2 metal ion. 3. A solid compound of a group 1 (alkali) metal and a group 17 (halogen) element dissolves in water. The diagram above represents one type of solute particle present in the solution. Which of the following identifies the solute particle and best helps explain how the solute particle interacts with water molecules?