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| Question | Answer |
| Chemical weathering = | Minerals changed due to chemical reaction. They wash away and the rock is weathered. |
| Solution | Some minerals and rocks dissolve in water. Just like table salt, rock salt dissolves in water, making it vulnerable to solution whenever it rains. |
| Solution Equation | CaCO3 + H2O + CO2 ---> Ca(HCO3)2 [carbonic acid] --> [calcium bicarbonate] |
| Carbonation | Calcium carbonate become calcium bicarbonate which washes away. Rainwater is slightly acidic. Limestone is prone if it has lots of cracks. |
| Carbonation 1) | Rain picks up CO2. |
| Carbonation 2) | Becomes weak carbonic acid. |
| Carbonation 3) | Reacts with calcium carbonate. |
| Carbonation 4) | Becomes calcium bicarbonate, which washes away. |
| Example | Granite: feldspar mineral reacts to make kaolin (china) |
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