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写出下列反应的化学方程式并填空． （1）碳在过量氧气中充分燃烧： 该反应属于 （选填“放热”或“吸热”）反应． （2）锌和稀硫酸反应： ；反应类型是 （3）盐酸与碳酸氢按反应： ；明显的现象是 （4）实验室加热高锰酸钾制取氧气： 在发生装置的试管口放一团棉花的作用是 . （5）用熟石灰和硫酸铜溶液制备波尔多液： 反应类型是 ．
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