题目

甲，乙两烧杯中各盛有500ml，相同浓度的盐酸和氢氧化钠溶液。向两个烧杯中分别加入18.0g的铝粉，反应结束后，测得生成的气体体积比为甲：乙=1:2，则下列说法正确的是①甲烧杯中盐酸不足。②乙烧杯中金属铝过量。③甲烧杯中生成的气体体积为11.2L④乙烧杯中的c(NaOH)=2mol/LA.①③ B.①④ C.②③ D.②④ 答案：【答案】B【解析】发生的反应分别为2Al+6HCl═2AlCl3+3H2↑、2Al+2NaOH+2H2O═2NaAlO2+3H2↑，铝粉质量一定，盐酸和氢氧化钠溶液中溶质的物质的量相同，若酸、碱足量，生成气体物质的量相同；铝粉都过量，酸、碱不足，生成气体物质的量之比为1:3，而实际反应结束后测得生成的气体体积比为甲:乙=1:2，说明Al根据括号内所给单词的适当形式填空。1. He _______ (hang) with his friends last night so he get up late this morning.2. There are many _______ (visit) in Huang Shan every year.3. Who _______ (teach) you English last term?4. We are having a _______ (meet) the day after tomorrow.5. Mei Lanfang _______ (become) a Beijing Opera actor when he was ten.6. Everyone should _______ (sleep) for more than eight hours to be healthy.7. We went _______ (camp) on our last school trip.8. What did you _______ (buy) for Li Fang as a present?9. It looks _______ (like) her mother very much.10. He _______ (real) likes to watch TV shows.