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Pokusy v laboratoři Důkaz vápence ve schránkách měkkýšů a ptačích vajíček. Žáci drtí slepičí skořápku ve třecí misce, přikapávají ocet do zkumavek se vzorky vápenitých schránek a pozorují vývoj plynu oxidu uhličitého vznikajícího při reakci.
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