What do they think will happen if they used vinegar instead of detergent?
3. Capillary action
Cut out a flower from the template. You can get your students to colour it in if you like. Fold the flower so the petals cover up the smiley face. Put some water into a Petri dish and ask the students to predict what will happen when they put the folded up flower on top of the water. Now get them to float the folded flower on the water and watch what happens, get them to record this in their notebook or on a worksheet. Ask your students what they think has happened. For example you can get them to see if the paper is wet (does the dry flower unfold by itself).
Take a white carnation or a stick of celery with leaves attached. Carefully split the stem into two halves, placing one half in a cup with water and red food colouring, the other half into a cup with water and blue food colouring. It will take a couple of hours (maybe longer) for the red and blue food colouring to make it to the flower or the celery leaves.