I consider myself someone with a certain interest in scientific things. This text is in the chemistry book "element chemistry" North Rhine-Westphalia had 9 / 10 I now read several times and get him to crack:
"dipped a zinc rod in a copper salt solution to give zinc atoms from electrons which are absorbed by copper ions, this." Flow "of electrons from atoms to ions corresponding to the flow of electric current, which should be demonstrated. "
Aha. Why is then immersed in the picture above the zinc bar in a potassium chloride solution? And what does "should have to prove?"
more.
" Galvanic cell. The zinc rod and the copper salt solution must be separated (aha, so there 's not the staff in the copper chloride solution. But why is it still from control electronic ???). between the two, the flow of electrons through an electrical conductor, eg a metal wire or charcoal, are made possible (it should read well, the electrons make their way through the line over to the other solution, where swim the copper ions) ... When, on the charcoal in the copper salt solution, copper ions caused by the absorption of electrons of copper atoms, negatively charged ions are left behind (which since: chlorine ions?). At the same time resulting zinc rod zinc ions, creating a surplus, of positively charged ions. It must have taken place say between the two solutions, a charge balance between positively and negatively charged ions. .? This can be achieved, for example through a permeable wall "
Alright Moreover, the principle of galvanic cell at Wikipedia also explains stupid: the picture is working with zinc and copper, explains the principle but with Copper and Silver. What it is established that scientific Thinking and teaching skills do not go hand in hand ... 
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