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.
check all reactions that occurred
combustion

decomposition

double replacement

synthesis

1) Answer is: double replacement.

Balanced chemical reaction: NaHCO₃ + HCl → NaCl + H₂CO₃.

Double replacement reactions (double displacement or metathesis reactions), two ionic compounds are exchanged, making two new compounds.

2) Answer is: decomposition.

Balanced chemical reaction: H₂CO₃ → H₂O + CO₂.

Decomposition is reaction where one substance is broken down into two or more simpler substances.