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Experimente efectuate d e elevii clasei a-Vll-a C

Experimente efectuate d e elevii clasei a-Vll-a C. III.Reactia chimica de inlocuire ( Substitutie ) Experiment:

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Experimente efectuate d e elevii clasei a-Vll-a C

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  1. Experimente efectuate de elevii clasei a-Vll-a C

  2. III.Reactiachimica de inlocuire(Substitutie) • Experiment: • Intr-o eprubetaluati o solutiediluanta-de sulfat de cuprusiintroducetiapoi cu grija(san nu se spargaeprubeta)un cui de fier.Lasati 1-2 minute eprubeta in stativsiurmaritiapoiculoareasolutieisiaspectulcuiului de fier.

  3. Observatie: • Treptat,treptatculoareaalbastra a sulfatuluidecupru se modifica,devenindverde,datoritasulfatului de fierformat,iarcuiul de fier se acopera cu un strataramiu de cupru. • Definitie: • Procesulchimic in care o substantasimplainlocuieste un element chimicdintr-o substantacompusa se numestereactia de inlocuiresau de substitutie. • Reactiile de inlocuire au o deosebitaimportanta,intrucateleconstituiemetode de obtinere a unorsubstantechimice.Deexemplu,actiuneaacizilorasuprametalelorconstituie o metoda de obtinere a hidrogenuluisi a sarurilor.Scoaterea din combinatiiaunormetale de catrealtele,cucaractermaielectropozitiv,isigasesteaplicatia la obtinereadiferitelormetale.

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