What is the balanced equation for H2O2 + KI + dish soap I am not sure how to balance $\ce{H_2O_2 + KI + dish soap}$.   Is the dish soap involved in the equation or just to show the produced gas?  Is it a double replacement or does the $\ce{KI}$ just act as a catalyst and $\ce{H_2O_2}$ is deconstructed to $\ce{2H_2O + O_2}$? It has been a while since I had chemistry.
Ah!! The elephant toothpaste experiment.
First thing first, this reaction is actually a decomposition experiment as the following equation.

$$\ce{2H2O2 -&gt; 2H2O + O_2}$$

Second, $\ce{KI}$ acts as a catalyst in this experiment. You also can use $\ce{MnO4}$ too as the catalyst for this experiment.

Third, the dish soap makes the product of the experiment more soapy and bubbly. So, you can see it will create look like a toothpaste. If you didn't put the dish soap, it will only look like gas bubbling out if the solution.