Exam 1A - key

Exam 1A - key - Chemistry 112A Exam No 1 1 atm = 760 mm Hg...

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Chemistry 112A Exam No. 1 February 17, 2006 1 atm = 760 mm Hg L •atm R = 0.0821 mol •K T K = t °C + 273 1 L = 1000 mL J R = 8.31 mol •K 1 kg = 1000 g 1. (12 points) Match each of the following substances with the strongest force broken when the substance melts. a. Fe d covalent bonds b. CO 2 f dipole forces c. ClOH b dispersion forces d. C(diamond) c hydrogen bonds e. Na 3 PO 4 e ionic bonds f. NCl 3 a metallic bonds 2. (6 points) A solid melts at 2000°C and the liquid does not conduct a current well. Circle the type of solid that best matches this description. ionic metallic molecular network covalent 3. (6 points) Why is CH 3 NH 2 very soluble in water? The compound has NH bonds so it can hydrogen bond with water.
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- 2 - 4. (8 points) The relative strengths of intermolecular forces are dispersion forces < dipole forces < hydrogen bonds Explain why the strengths of the forces follow this order. Dispersion forces are just temporary dipoles and would therefore be weaker than
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Exam 1A - key - Chemistry 112A Exam No 1 1 atm = 760 mm Hg...

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