Yesterday yr.6 started their topic on reversible and irreversible reactions. They combined different substances with water to see if they were soluble or insoluble. They also found that if a substance reacted with the water and created bubbles something new had been made and you couldn’t get the original substance back. This was a chemical, irreversible change.
We then used one of the chemical reactions, combining Alka-Seltzer with water, in a film canister. As there was no where for the carbon dioxide that was produced to go the pressure built up inside the film canister. When the pressure got too great, the lid fired off into the air like a rocket. It was great fun and there were rockets flying everywhere!