As a cake bakes, sodium bicarbonate reacts with acids in the cake. The bicarbonate ion and the anion in the acid change places to make carbonic acid. The carbonic acid then breaks down to produce carbon dioxide bubbles that make the cake rise. Check all of the reactions that occurred.

The bicarbonate ion and the acid’s anion exchange partners to form carbonic acid, which is a double-replacement reaction. Carbonic acid then breaks down into carbon dioxide and other products, so that step is decomposition. The reaction does not involve burning, as combustion would, or combining substances into a single product, as synthesis would.

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