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Chemical weathering can change the physical shape of rock as well as its chemical composition. when water enters along the joints in a rock, it weathers the corners and edges most rapidly. rock have a greater surface area than the faces have. As a result, the corners and edges become more rounded.
Let's review. Chemical weathering is the process by which rocks are broken down by chemical reactions. There are different types of chemical weathering. Hydrolysis is the chemical breakdown of a substance when combined with water.The most common example of hydrolysis is feldspar in granite rocks changing to clay.his is a very slow process because lichens are slow-growing and the acid they produce is very weak. However, this is a common type of chemical weathering near rivers and streams. So we see that lichens break down rock by producing acid and we see a similar phenomenon with acid rain.