Question

a student wants to create a liquid volcano. the student observes bubbles in the soft drink prior to opening it. the student first proceeds to open the soft drink bottle and place it on the floor. next the student drops candy tablets into the drink at a continuous pace. the student notices a very powerful reaction in which the candies, still intact, are pushed out of the soda as the drink fizzes and starts to bubble. in this scenario, what would be the catalyst? the candy tablets being added to the drink. the gasses being released when the drink was first opened. the liquid in the container. the container that holds the liquid.

Explanation:

A catalyst is a substance that speeds up a chemical reaction without being consumed in the process. In the case of the "liquid volcano" with soda and candy tablets (e.g., Mentos and Coke), the candy tablets provide a large surface area for the carbonic acid (\(H_2CO_3\)) in the soda to decompose into water (\(H_2O\)) and carbon dioxide (\(CO_2\)). The candy tablets are not chemically altered in the reaction (they remain intact as stated in the problem), which is characteristic of a catalyst. The gas release when opening the drink is just pressure - related (Henry's law, not a catalytic effect). The liquid (soda) is the reactant (carbonic acid is part of it), and the container is just a holder with no catalytic role.

Answer:

The candy tablets being added to the drink.