The chemical reaction taking place in Steve's stomach is the Single displacement.
The stomach antacids
Stomach antacids have the power to neutralize excess gastric HCl present in our stomach, which is responsible for aiding in the digestion of the food we eat.
Displacement reactions
Displacement reactions, also called substitution reactions or simple replacement reactions, are those that occur when a simple substance (formed by a single element) reacts with a compound substance, “displacing” the latter into a new simple substance.
With these information, we can conclude that the chemical reaction taking place in Steve's stomach is the Single displacement.
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