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• U treću epruvetu<br />
stavi granulu cinka,<br />
a u četvrtu malo<br />
cinka u prahu.<br />
• U obje epruvete ulij<br />
po 2 mL razrijeđene<br />
klorovodične (solne)<br />
kiseline.<br />
Kako veličina površine utječe na<br />
brzinu kemijske reakcije
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