As the 74th Annual Chemistry Games began, the contestants, Eric Leerencium, Albert Leethium, Jason Arkong, and AK Magnesium, run for the backpacks.
Eric threw a baking-soda-and-vinegar bomb at Albert so he can take his check plus.
H2CO3 -> H20 + CO2
After Eric and AK meet and fight a bit, Eric creates a fire through a combustion reaction and eliminates AK. He must put out the fire using baking soda, producing CO2, so it would lack O2 that the fire needs to keep burning.
Jason creates a Dry Ice Bomb by using PV=nRT. He adds water to a container with dry ice in it. The dry ice (solid CO2) heats up in the container and it becomes a gas. The pressure increases because the number of moles of CO2 increases in the constant volume of the sealed container, causing it to explode.
Since Eric swatted the Dry Ice Bomb, Jason followed up with a spray from Coke and Mentos. He used PV=nRT again. The spray was a result of the increase of CO2 and the increase of volume due to the opened Coke bottle.
After Eric defeated Jason by diluting his HCl attack with baking soda, he created a victory smoke-flare, celbrating his win