Homework 5.docx - CHM 124 GENERAL CHEMISTRY II SPRING 2018...

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CHM 124 GENERAL CHEMISTRY II SPRING 2018 TAKE HOME ASSIGNMENT #1 SHOW YOUR WORK! 50 points total 1. (15 points) On the basis of the following descriptions, label each substance as one of the following particular types: molecular solid, metallic solid, ionic solid, network solid, amorphous solid, or rabbit. a. Hard and brittle; dissolves easily in water and conducts electricity when dissolved, but not when solid. Melting point is extremely high. b. Ductile, malleable, fine conductor of electricity and heat. c. Hard, transparent, brittle, does not conduct electricity, shatters into randomly shaped fragments (shows no obvious signs of crystalline order). d. Chews carrots, burrows through soft earth, poor conductor of electricity, soft fuzzy exterior. e. Extremely hard, gleaming, often found on engagement rings, made entirely of carbon.
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f. Melts at room temperature, will not freeze or boil in the absence of some crystalline ‘seed.’ 2. (5 points) Explain why ethanol is added to gasoline in some states. 3. (10 points) Tetraethyl lead was once used as an anti-knocking agent in gasoline. Explain a)
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