实验是学习化学的一个重要途径。
（1）根据下图回答问题。
A B C D E
①仪器a的名称是 。
②实验室用高锰酸钾制取氧气时，所选用的发生装置是 （填字母序号，下同），收集装置是 或E。用过氧化氢溶液和二氧化锰制取氧气的化学方程式为 。
（2）实验室配制50g 5%的氯化钠溶液的操作示意图如图所示。其中玻璃棒的作用是 。该实验的正确操作顺序为 （填字母序号）。
（1） ①集气瓶 ②A C 2H2O2 2H2O + O2↑
（2） 搅拌 CBDEA
题目分析：（1）实验室用高锰酸钾制取氧气，属固固加热型，选A装置，氧气的密度比空气大，难溶于水还可以用排水法收集；过氧化氢溶液和二氧化锰生成水和氧气，其中二氧化锰是反应的催化剂；
（2）配制溶液的一般过程是：计算、称量、溶解。其中用到的玻璃棒的作用是搅拌，加快溶解速率
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| In Brazil, soccer is 1 an art form. That is the best 2 for the soccer museum to be built. Brazil is the land that 3 footbail greats 4 Garrincha, Zico, Romario, Ronaldo, Kaka, and the 5 of all, Pele. It is the only country 6 for every World Cup, and the only one to win it five times. In order to 7 the greatest sport of the nation, the Museum do Futebol, or Football Museum, opened at Pacaembu Stadium in Sao Paulo. 8 entering the 9 , 10 are greeted 11 Portuguese, Spanish and English by a life-size image of Pele, who is so famous in brazil 12 he is known simply 13 "O Rei," or "The King". "The Louvre has the 14 . We have our own piece of 15 -Pele," said Hugo Sukman of the Roberto Marinho Foundation, which helped 16 the construction of the museum. In many ways, the museum is a shrine (神龛) to Pele. One of its most impressive displays is a temporary exhibit with 140 items from Pele's personal collection. 17 the wooden shoeshine box he used as a boy to 18 spare change and the ball from his l, 000th 19 in 1969. "Inevitably, a museum about football is also a museum about the 20 of Brazil and Brazilian culture," said Leonel Kaz, the museum's curator (馆长). | ||||
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