Advpter f0rsunky D100.01.103с6-8, Ukraine

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There is a lecture on chemistry. The professor holds a flask with acid in one hand, and a 5-mark coin in the other.
- What do you think, if I throw a coin into acid, it will dissolve?(//tractor-service.com)
A student in the back row raises his hand:
- Of course not! If the coin could dissolve, you would take
1 pfennig!
SS.