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• 例1.下列反应能否发生,为什么?
• A. Mg+H2SO4=MgSO4+H2↑ • B. Cu+2HCl=CuCl2+ H2↑ • C. 2Fe+6HCl=2FeCl3+3 H2↑ • D. Zn+2HNO3=Zn(NO3)2+ H2↑ • E. Cu+2AgCl=CuCl2+2Ag • F. 2Na+CuSO4=Cu+Na2SO4 • G. Fe+Zn(NO3)2=Zn+Fe(NO3)2
• Fe+H2SO4=FeSO4+H2↑
• 56
2
• Zn+H2SO4=ZnSO4+H2↑
• 65
2
• 2Na+2HCl=2NaCl+H2↑
• 2×23
2
• 2Al+6HCl=2AlCl3+3H2↑
• 2×27
3×2
• 生成1g氢 气所需金属 质量为
Ar
n
Ar:金属的相 对原子质量
n:产物中金 属元素化合价
A . X>Y>Z B . X>Z>Y
C . Y>X>Z D . Y>Z>X