15. (S points) Select the predominant concept or word from the list below that a

Question

15. (S points) Select the predominant concept or word from the list below that applies to the following situations. Write your answer in the blank. Answer FIVE of nine situations Only the FIRST five with answers will be graded. If you answer more than five, the last three answers will be ignored Choose carefully!!! List of some concepts discussed in Chem 1303 this semester A. PV nRT B E hy G. Delocalized bond H Hydrogen bonding C Molecular polarity (polar vs nonpolar) D. Covalent crystal E ion dissociation and electrolytes F. Vapor pressure of water Pauli exclusion principle Hund's rule K Ice melts under increasing pressure Situations Water boils at lower temperature at the top of Mountain Everest People could skate on the surface of ice Electrical equipment should not be operated with wet hands Graphite is good electricity conductor Microwave cannot heat dry ice effectively Tires should not be inflated to high pressure in summer Diamond is one of the hardest material on earth Ice floats/Formation of frost heaves and pot holes in pavement Neon lights have many different colors Once more: Only the FIRST five with answers will be graded. If you answer more than five, the three answers will be ignored. Choose carefully!!

Explanation / Answer

F : Vapor pressure of water. At the top of mount everest, atmospheric pressure is less, thus, the vapor pressure required to counter it is less, thus, water boils at a lower temperature. K : Ice melts under high pressure. This reduces friction and we are able to glide through ice while skating. E : Ion dissociation and electrolytes. Water contains many ions which can conduct electricity, giving us shocks if proper insulation is not used. G : Delocalized bond. Graphite has hexagonal sheet structure, witheach carbon atom forming 3 bonds (sp2) and the fourth bond pair is delocalized throughout the sheet, this helps in conduction of electricity. C : microwave polarity. microwaves heat a substance by making the molecular dipoles rotate continuously with changing magnetic fields. Obviously, non-polar molecules won't be affected by it. Thus, microwaves can't properly heat dry ice (solid CO2) which is a non-polar compound. A : PV=nRT. Volume is directly proportional to temperature. D : Covalent crystal. Every carbon has 4 very strong covalent bonds, rendering it very hard. H : Hydrogen bonding. Water has density higher than ice due to hydrogen bonding. B.

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