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a. H_2 b. HCl c. CF_4 d. N_2 e. CH_4 f. HF g. H_2O h. Cl_2 i. NH_3 j. CHCl_3 Nonpolar and Polar Molecules: To determine if a molecule is polar or nonpolar, you need to determine if there is a diffe...
化学键的定义：一种存在于分子内的强烈的相互作用力。化学键根据形成机理的不同，可分为:金属键、离子键和共价键。在分子和分子之间还存在分子间作用力:范德华力、氢键。分子内和分子间的作用力结合起来，决定了物质的结构，在宏观上表现为世界上形形色色的各种物质。结构决定性质，所以很多物质的物理性质都可通过...
+ + 5. Conveying Modified Source Versions. + + You may convey a work based on the Program, or the modifications to +produce it from the Program, in the form of source code under the +terms of section 4, provided that you also meet all of these conditions: + + a) The work must ...