What do students need to know to understand catalysts -

Multimedia Create a drag and drop of sequence of learning as a quick tests - key ideas to inlcude are energy, band energy, activatin energy, bonding,etc

Follow this with a short disucssion about what students find difficult - ie where collsion theory is no longer good enough to explain catalyst and you have to start thinking in terms of bond breaking and making and the fact that catalysts weaken the bonds, so less energy is needed to break them. Deep link to DU where this is taken up in more detail.