题目

草木灰主要成分是碳酸钾。现从草木灰中提取钾盐，并用实验检验其中的S、C和Cl-。(1)从草木灰中提取钾盐的实验操作顺序如下：①称量样品，②溶解和沉淀，③______，④_______，⑤冷却结晶。(2)用托盘天平(指针向上的)称量样品时，若指针偏向右边，则表示___。 A.左盘重，样品轻 B.左盘轻，砝码重C.右盘重，砝码轻 D.右盘轻，样品重(3)在进行②③④操作时都要用到玻璃棒，其作用分别是_____、______、______。 (4)将制得的少量晶体放入试管，加蒸馏水溶解 English Summer Camp What will you do during your summer vacation? English Summer Camp 2009 at Shandong University Age group:12 to 16 For more information, call 85435489 Fax: 88854327 E-mail: summercamp123@163.com Pop Music Concert Bands from home and abroad will perform in Beihai Park, Beijing, Singers like Britney Spears and Sun Nan will also come! Price: 30 yuan for each child 50 yuan for each adult Time: 9:00 am- 9:00 pm Tel: 76336789 Chess Club Every Thursday evening Time: 7:30 pm- 9:30 pm Learn to play chess in our club You don’t need to pay for anything It’s all FREE Tel: 63235521 Fax:63435637 National Library of China Monday to Friday: 8:30 am-8:00 pm Saturday to Sunday: 9:30 am-5:00 pm Address: No.33, Haidian District, Beijing, 100081 Tel:67452366 1．You can borrow some books from the National Library of China at _______ A．8:00 am on Sunday                                     B．11:00 am on Monday B．6:30 pm on Sunday                                     D．9:30 pm on Monday 2．Mary and her friend want to learn to play chess. They should call ______ A．67452366               B．85435489                C．63435637               D．63235521 3．The English Summer Camp will be held at ______ A．National Library of China                            B．Shandong University C．Beihai Park                                                D．Britney Spears 4．The Chinese meaning of the underlined phrase “home and abroad” is _____ A．全家出国               B．国内外                   C．国外的家庭            D．国际家庭 5．If Mr. and Mrs. Green with their nine-year-old daughter to enjoy the pop music, they should pay _____. A．80 yuan                  B．110 yuan                 C．130 yuan                D．100 yuan