Today our Year 7’s were learning about carbon dioxide. They were testing for CO2 using limewater which turns cloudy when exposed to carbon dioxide gas. To finish off the lesson they were shown what happens when coke and mentos are combined; the mixture instantly releases the CO2 in the coke bottle creating a spectacular soda jet. This happens because the rough surface of the mentos lets the carbon dioxide degas out of the liquid. Please do not try this at home.