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HW5sol - mcdonald(pam78654 HW 5 Condensed Matter...

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mcdonald (pam78654) – HW 5: Condensed Matter – laude – (89560) 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0points Which one of the following substances is IN- CORRECTLY matched with the kind of solid that it forms? 1. methane : molecular 2. sulfur dioxide : molecular 3. graphite : covalent 4. calcium bromide : ionic 5. lithium : covalent correct Explanation: Molecular solids consist of molecules held together by weak intermolecular forces. Ionic solids are held together by electro- static attraction between metal cations and non-metal anions. Metallic solids consist only of metals held together by metallic bonds. Covalent (or network) solids are like huge molecules held together by covalent bonds. Carbon in diamond is the most well-known example. Group IV B elements can form tetrahedral electronic geometries. Lithium will form a metallic solid. 002 10.0points Why does it take longer to cook foods in boiling water at higher altitude than at or below sea level? 1. The ambient temperature is lower at higher altitudes. 2. There is a reduction in atmospheric pres- sure. correct 3. It does not take longer. 4. There is an increase in atmospheric pres- sure. Explanation: The reduced atmospheric pressure results in a lower boiling temperature. 003 10.0points Arrange the compounds CsCl , BaCl 2 , diamond (C) , H 2 , HF in order of increasing expected melting points. 1. H 2 , HF, diamond, CsCl, BaCl 2 2. HF, H 2 , CsCl, BaCl 2 , diamond 3. H 2 , HF, CsCl, BaCl 2 , diamond correct 4. HF, H 2 , diamond, CsCl, BaCl 2 5. H 2 , HF, BaCl 2 , CsCl, diamond Explanation: 004 10.0points Which of the following statements regarding intermolecular forces (IMF) is/are true? I) Intermolecular forces result from attrac- tive forces between regions of positive and negative charge density in neighbor- ing molecules. II) The stronger the bonds within a molecule are, the stronger the intermolecular forces will be. III) Only non-polar molecules have instanta- neous dipoles. 1. II and III 2. I only correct 3. II only 4. III only 5. I and III 6. I and II 7. I, II, and III
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mcdonald (pam78654) – HW 5: Condensed Matter – laude – (89560) 2 Explanation: Statement I is true - all IMF result from Coulombic attraction. Statements II and III
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