将固体NH4I置于密闭容器中,在某温度下发生下列反应:NH4I(s)NH3(g)+HI(g)、2HI(g)H2(g)+I2(g),当反应达到平衡时,c(H2)=0.5mol/L,c(HI)=4mo
Some 80 percent of graduate students in East China's Zhejiang province said in a survey they will give up trying to find jobs in Beijing, Shanghai and Guangzhou, first-tier cities in China that have b
从下列图片中不能获取的信息是( ) A.分子之间有间隔 B.硅原子是由原子核和电子构成的 C.构成物质的粒子有分子、原子和离子 D.受热水分子运
下列说法正确的是( ) A.汽油放置在空气中没有燃烧是因为汽油不是可燃物 B.铁制品生锈产生的铁锈是一种疏松多孔的物质,它的主要成分是Fe3O4 C
完成下列反应的离子方程式: ①碳酸钙溶于醋酸中 ; ②向稀氨水中加入稀盐酸 ; ③向NaHSO4溶液中逐滴加入Ba(OH)2溶液至中性,请写出发生反应的离
Mr.Clinton and his 13-year-old son Tony are basketball fans. Last October 10th was Tony’s birthday, so Mr.Clinton decided to drive him to New York, for the first game of the World Series. They had n
The boss went into the house , ___the five boys ____ in the rain . A.left ; standing B.leaving ; standing C.left; stand D.leaving ; stand
设NA为阿伏伽德罗常数的值。下列叙述正确的是 A.1mol甲醇中含有C-H键的数目为4NA B.25℃,PH=13的NaOH溶液中含有OH-的数目为0.1NA C.标准状况下,2.24L已烷含有