【简答题】French fries, ___1___ with a pint of soda, are a favourite part of fast-food lunches and dinners for millions of American youngsters. But taking a cue from health experts, a group of 19 ___2___ are pl...
【简答题】短周期元素形成的纯净物A、B、C、D、E之间的转化关系如图1所示,物质A与物质B之间的反应不在溶液中进行(E可能与A、B两种物质中的某种相同). 请回答下列问题: (1)若C是离子化合物,D是一种强碱,写出C的化学式______. (2)若E是有臭鸡蛋气味的气体硫化氢(其水溶液为二元弱酸),D是既能溶于强酸、又能溶于强碱的化合物. 用等式表示E与NaOH溶液反应后生成正盐的溶液中所有离子浓度之间的...
【简答题】弱酸性水溶液中的氢离子浓度可表示为 (A) 14-pOH; (B) ; (C) 10 pOH-14 ; (D) 10 14-pOH 。
【简答题】Unit 1-P6 Compare the two paragraphs and point out which makes a better claim and explain . 1. I am against closing the snack bars on the south side of the campus and replacing them with vending machi...