Volcano
Use bicarbonate of soda and vinegar to get a fizzing chemical reaction ! Equipment: bicarbonate of soda, vinegar, washing up liquid, small container like a plastic bottle or yoghurt pot (optional: plasticine, red food colouring)
Get a container for your volcano - the smaller the container the less soda and vinegar you'll need for it to spill over. This could get messy so you might want to do it outside or on a tray
Before you start adding ingredients you could make your container look like a volcano by getting the kids to build plasticine onto the sides - but this is optional