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（2011浙江台州，32题）和同学用稀硫酸与锌制取氢气时，发现添加少量硫酸铜溶液能加快反应。硫酸铜溶液是稀硫酸和锌反应的催化剂吗？硫酸铜溶液量的多少会影响反应速率吗？ （1）他们先进行如图实验，观察到试管B中产生气泡速度快得多，并有暗红色固体生成。A实验的作用是 ；他们认为CuSO 4 溶液不是催化剂，所依据的实验现象是 。 （2）在6支试管中分别加入2颗大小形状都相同的锌粒，倒入等质量、等质量分数的稀硫酸；按下表所示条件进行实验，并测量收集50毫升氢气所用的时间。记录如下： 试管 A B C D E F CuSO4溶液/毫升 0 0.5 1 1.5 2 4 水/毫升 4 3.5 3 V 1 V 2 0 收集H2所用的时间/秒 348 246 190 165 230 360 ①试管D中加入谁的体积V 1 = 毫升；
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相关题目：
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A.
Offer cheaper DVDs and workbooks
B.
Sell books individually
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Provide discounts to professors
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the probability that a   counterparty will default.
B.
the probability that   both counterparties default.
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D.
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两部
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They should sponsor the writers in poverty.
B.
They should supervise the book quality.
C.
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