2018年中考化学真题分类汇编1物质的构成和变化考点5物质的变化与性质4化学反应7条件对比(无答案).doc

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1条件对比(2018遵义) 通过调控影响化学反应的因素可以更好地利用化学反应为人类造福。(1)Zn+H2SO4=ZnSO4+H2,Zn+2H2SO4(浓)=ZnSO4+2H2O+SO2;反应物相同,不同,产物有差异;(2)4Na+O2=2Na2O,2Na+O2Na2O2;反应物相同,不同,产物不同;(3)工业生产中常将固体原料粉碎,是通过改变,加快了化学反应的速率并提高原料利用率;(4)在实验室欲制取较纯净的 H2,药品只有锌粒和浓硫酸,应将药品进行处理后再使用,其处理的办法是。

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