On Friday after school Neil and I, spotted a toy submarine in the science cupboard, on the box it said that it was powered by baking soda. So we took out the mini submarine, and read the instructions. First we took the cap off the submarine, and tipped some baking soda into the small open chamber. When the chamber was full we pressed the cap on. the next part of the instructions was to, dip the submarine in a large bucket of water and shake it wildly, then we let it go, firstly the submarine sank to the bottom of the bucket. But suddenly bubbles started to come from the submarines direction. Then the submarine started to float back up to the surface of the water. Then the submarine tilted and sunk back down again. I learned that it was caused because, the water was reacting with baking soda that made gas, that’s why there was gas bubbles coming from the submarine.