https://docs.google.com/viewer?a=v&pid=explorer&chrome=true&srcid=0BzFUvVu_WNI_NTE0NDFhNTAtYjY0My00ZWZjLTkwZWMtZjIxNWFhNmY1ZDQx&hl=en
This is the link for the Patterns of Reactivity topic we started today, so make sure you understand what was covered.  I also included some more questions for a Year 8 class, so taking a look at them would be useful too (on the second slide).