The amount of chemical weathering will increase if

Chemical Weathering is the process of decomposition, erosion and spoilage of Solid materials like Building Material, Rocks e. t. c.

This decomposition takes place due to chemical reaction. The chemical present in Air along with water undergo chemical decomposition of Solid materials.

So, first requirement for this process is water, which is present in air called precipitation. Secondly, temperature also play important role.

Result:

The amount of chemical weathering will increase if Temperature and Precipitation Increases.