1.(12分)(1)bd(2分)(2)d(2分)(3)CO2(2分)氨气分子为极性分子,易溶于极性溶剂水中;氨气分子与水分子间易形成氢键;氮气可与水反应(3分)(4)氢键范德华力(2分)非极性键(1分)【解析】(1)由结构简式知维生素B2中存在离子键、非极性共价键极性共价键,a项错误,bd项正确;与氯化钠晶体相比,维生素B1中阳离子半径比Na+半径大,维生素B1的晶格能小,熔点不可能高于NaClc项错误(2)维生素B1晶体溶于水的过程中会电离出C-等需克服离子键维生素B2分子间存在氢键、范德华力故选d项(3)N2为单质,另外五种化合物中属于非极性是CO2NH3极易溶于水,是因为NH和水均为性分子,NH3溶于水后,NH2与水分子间可形成氢键,NH1可与水反应(4)渡氨汽化破坏分子间作用力包括氢键和范德华力;氮气分解生成N2和H2,破坏氮氢极性键N2、H2生成氮原子和氢原子,破坏非极性键

ood morning,Ms. KingOn this special occasion, I feel much honored toyrepresent the class to express our sincere gratitude to youfor your excellent workThanks to your generous help as well as ydudgreatdevotion and efforts, we've become more interested and-lone better in our English, which will be ofgreatlng, here s a pencontainer, a souvenir that we've specially prepared foryou. Hopefully you'll like it. This pen container'is madeof bamboo, which is evergreen and hollow inside so that inChinese culture it's a symbol of being young and modestWhat makes it special is that we've all signed on'it, making it a good reminder of the happy time we spent togetherNow, I'd also like to wish you a pleasant joumey home andalways young and happyThank you very much!

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