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Apparatus: Two test tubes, balance, meas...

Apparatus: Two test tubes, balance, measuring cylinder, etc.
Chemicals: Pieces of Shahabad tile, powder of Shahabad tile, dilute HCl, etc.
Procedure: Take pieces and powder of Shahabad tile in equal weights in two test tubes. Add 10 mL dilute HCl in each of the test tubes.
Observe whether effervescence of `CO_2` is formed at a faster or slower speed

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The effervescence of `CO_2` is formed slowly with the pieces of Shahabad tile while at a faster speed with powder of Shahabad tile.
Inference: The rate of a chemical reaction depends upon the size of the reactant particles taking part in the reaction. Smaller the size of the reactant particles, higher is the rate of reaction.
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