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ID number:243612
 
Author:
Evaluation:
Published: 27.03.2009.
Language: Latvian
Level: Elementary school
Literature: n/a
References: Not used
Extract

Pētāmā problēma.
Kā pēc raksturīgām reakcijas pazīmēm var salīdzināt glikozes saturu pārtikas produktos?

Hipotēze.
Ja glikozes saturs pārtikas produktos būs atšķirīgs, tad glikoze reducēs vara(II) hidroksīdu par dažādiem vara savienojumiem, kurus var pazīt pēc krāsas.

Darba piederumi, vielas:
10% NaOH šķīdums, 2% CuSO4 šķīdums, 10 % glikozes šķīdums, spirta lampiņa, 3 mēģenes, pilināmā pipete, stikla nūjiņa, mēģenes turētājs.

Darba gaita.

Author's comment
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