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NAME ___________ KEY _____________ CHEMISTRY 20 ASSIGNMENT 2-8 TOPIC(S) COVERED: Text (63-77) TOTAL MARKS: 59 DIRECTIONS: Read pages 63 to 77 in the text and answer the following questions on this paper. You must use only the information in the text to answer all questions. Complete sentences are not required. 1. Each ion is attracted to several oppositely charged ions surrounding it. (1 mark) 2. A continuous set of bonds exist from one ion to the next and to the next. (1 mark) 3. In molecular compounds, each atom is covalently bonded to the other atoms in one molecule. (1 mark) 4. The forces involved in these bonds act only between atoms within the same molecule and are, therefore, called intramolecular forces. (1 mark) 5. Covalent bonds, however, do not act between atoms of different molecules. (1 mark) 6. Intermolecular forces—the forces that are involved in the interactions between molecules. (1 mark) 7. These forces are also called van der Waals forces. (1 mark) 8. In a polar molecule, one end is slightly positive and the other end is slightly negative . Because these molecules have two different “poles,” they are called dipoles . (2 marks) 9. When any two dipoles are near each other, the positive end of one attracts the negative end of the other. (1 mark) 10. This attractive force is called a dipole-dipole attraction . (1 mark) 11. Although the dipole-dipole attraction is not nearly as strong as the force between ions, it can still cause polar molecules to be attracted to each other enough to stabilize a solid crystal. (1 mark) 12. One specific dipole-dipole interaction, called hydrogen bonding, is so strong and so important in both water and biological molecules that it is given a category of its own. (1 mark)
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