One of our Year 1 pupils completed the mentos and coke experiment. He made a tube to hold the mentos in and, with the help of his uncle, he made a slice in the tube for a butter knife to go through to stop the mento's going in the coke too soon.
“We took the bottle outside and took the lid off. He put his tube of mento's on top and stepped back and pulled the butter knife out. The mento's fell into the bottle of coke and reacted together causing the bottle to fizz up and out 'like a volcano'”.