Chemical weathering is the process by which rocks and minerals undergo changes in their chemical composition due to reactions with water, air, and other substances. This process can lead to the breakdown of minerals, making them more susceptible to erosion. Common examples include the reaction of carbon dioxide with water to form carbonic acid, which can dissolve limestone. During chemical weathering, minerals like feldspar can transform into clay minerals through hydrolysis. Other processes, such as oxidation, can affect minerals containing iron, leading to rust formation. Overall, chemical weathering plays a crucial role in shaping landscapes and contributing to soil formation.