How does chemical weathering differ from mechanical wheathering

Mechanical weathering is the physical breakdown of rock into smaller pieces. Mechanical weathering breaks rocks down into smaller pieces. This gives the rock a larger surface area for chemical reactions to take place. Chemical weathering is the breakdown of rock by chemical processes.

You should never redesign your experiment. try and see what in your experiment you made a mistake on or try and test your experimemt with somebody else. see if they get the right results.