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    Jeremywhitts's Avatar
    Jeremywhitts Posts: 1, Reputation: 1
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    #1

    Jan 30, 2007, 05:20 PM
    balancing equations
    Can you please balance these for me please
    Zn+O2+ZNO2
    Copper(group 2)+hydrochloric acid=Copper(2)chloride +oxide
    pwd77's Avatar
    pwd77 Posts: 186, Reputation: 3
    Junior Member
    		  
    #2

    Feb 4, 2007, 08:36 AM
    Quote Originally Posted by Jeremywhitts
    Can you please balance these for me please
    Zn+O2+ZNO2
    Copper(group 2)+hydrochloric acid=Copper(2)chloride +oxide
    2Zn + O2 -> 2ZnO
    Zinc oxidizes to +2 state, oxygen reduces to -2, so two Zn are required for two O

    Cu + 2HCL -> CuCl2 + H2

    Cu oxidizes to +2 state, and 1 e- is required to reduce a hydrogen atom, so one Cu will reduce two H, which forms diatomic H2 gas
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