完成下列反应的化学方程式

(1)氢气在氧气中燃烧：                                        

(2)大理石投入稀盐酸中：                                         

(3)实验室用双氧水制取氧气(二氧化锰粉末作催化剂)：                                              

(4)碱式碳酸铜加热分解 ___                                     

(5)甲烷燃烧                                         

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