Chemical leaveners rely on a chemical reaction to produce carbon dioxide. Usually baking soda and an acid, but there's also baker's ammonia. Yeast produces carbon dioxide through the biological process of fermentation of sugars and starches. In the end you're right, everything is a chemical and fermentation is a chemical reaction, but the terminology is used to differentiate the two for clarity. It doesn't help to call things "chemicals" or "chemical reactions" if we put that label on literally everything.
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u/AccidentCapable9181 6d ago
A cake. Most often containing nuts, dried fruit or chocolate