Yr.6 looked at dissolving this morning in Science. They changed the rate of dissolving by using water at different temperatures. They found that the hotter the water the quicker the rate of dissolving.
They then used Alka Seltzer in water and found that it not only dissolved but also reacted in the water. It created a gas (carbon dioxide) which caused bubbles. We trapped this gas inside a small film canister causing the pressure to build up and fire the canisters into the air like rockets. We tried to make this happen at a reliable time by changing the amount of water and the amount of tablet. It was very tricky but great fun.