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已知草酸(H 2 C 2 O 4 )在加热条件下会发生分解反应，同学们对生成物产生了浓厚的兴趣，于是用实验的方法对生成的物质进行探究。 【提出猜想】产生的气体是一氧化碳、二氧化碳和水蒸气的混合物。 【查阅资料】（1）碱石灰是固体氢氧化钠和氧化钙的混合物。 （2）H 2 在高温条件下可以还原氧化铁。 【实验过程】同学们经过讨论设计了如下图所示装置，并进行了实验(部分夹持仪器已略去)。 （1）观察到装置D中产生的现象为_____________ 。 （2）装置C的作用为吸收混合气体中的水和二氧化碳，其中氧化钙与水反应的化学方程式为_____________。 （3）观察到装置B中澄清石 灰水变浑浊，写出此反应的化学方程式___________，由此得出的结论为______________。又知装置C的质量增加了，E中石灰水变浑浊了，并结合上述实验现象，某同学得出了结论。 【得出结论】同学认为猜想正确，请写出草酸分解的方程式___________。 【反思与评价】（4）根据上述实验现象，有的 同学认为草酸分解不一定生成CO。你认为他的看法是否合理？ 原因是_________。 （5）有同学认为上述实验中还有不合理的地方，你认为下列建议正确的是 ____________。（填数字序号） ①装置A、B之间增加检验水蒸气的装置 ②装置E后增加尾气处理装置 ③可将装置C换成装有浓硫酸的洗气瓶 ④可在装置C、D之间增加澄清石灰水的洗气瓶
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【单选题】我国现行《房屋建筑制图统一标注》规定,图纸幅面代号为 A3 的图纸幅面尺寸为 ( )
A.
841mm × 1189mm
B.
297mm × 420mm
C.
594mm × 841mm
D.
420mm × 594mm
【简答题】Grown-ups are often surprised by how well they remember something they learned as children but have never practiced still swim as well as ever ever since. A man when he gets back who has not had a cha...
【简答题】Grown-ups are often surprised by how well they remember something they learned as children but have never practiced ever since. A man who has not had a chance to go swimming for years can still swim a...
【简答题】阅读理解 Grown-ups are often surprised by how well they remember something they learned as children but have never practiced ever since. A man who has not had a chance to go swimming for years can still s...
【简答题】Cloze. s are often surprised by how well they remember something they learned as children but have never practised in the meantime. A man who has not had an opportunity to go swimming for years c...
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