Activity Series - The activity series is a list of metals...

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The  activity series  is a list of metals and their half-reactions arranged in order of decreasing ease of oxidation or  increasing ability to take an electron. How do you use this series? Very simply, any substance on the right-hand side of the arrows will be strong  enough to take an electron from any substance above it on the left-hand side of the arrows. For example, if a  Ag +  cation gets close to an Fe atom then the  Ag +  cation will take an electron away from  the  Fe  atom. In terms of a chemical reaction the activity series predicts 2Ag +  + Fe   2 Ag + Fe 2+ In contrast, when a  Fe 2 +  cation meets a  Ag  atom, the  Fe 2 +  cation will not be strong enough to take electrons  away from the  Ag  atom. That is, 2 Ag + Fe 2+   X  2Ag +  + Fe
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What happens when we mix   Ca   metal and   HCl   acid?
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