Zinc pieces, Zinc powder, Dil HCl and test tubes are given. a) Write the procedure of an experiment to prove that the rate of a chemical reaction increases, if solid substances are used in powdered form. b) What is the reason for the increase in the rate of a reaction if the solid substances are used in powdered form ?
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Answer:
When dilute hydrochloric acid is added to granulated zinc placed in a test tube, a colourless and odourless gas is evolved with bubbles.
The chemical reaction can be written as:
Zn2+ 2HCl → ZnCl +H2
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Answer:
Take a volume of dil HCl in two test tubes. Add a piece of Mg m to one of them . Add a piece of Zn of equal mass to the other.
Observation : Mg reacts faster with dil. HCl than Zn. This is due to the difference in the chemical nature of Mg and Zn.
(b) Mg+2HCl→MgCl 2 +H 2
Zn+2HCl→ZnCl2+H 2
(c) Rate of a chemical reaction
=amount of reactants used up/ time
=amount of product formed/time
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