At this year’s School Macmillan coffee morning, we got involved by bringing some of our experiments to the tables to share. They went well and all the parents really got involved with the science. We were entertaining the parents in between singing performances from all the different classes. The coffee morning was a great success, because the school raised over £500 for Macmillan!
We did an experiment using red cabbage. Before going to the coffee morning, we blended some and filtered it through paper towel to get the red cabbage juice. We filled large bottles with the juice, so everyone would be able to see what happened. Then we used lemon juice which is an acid, and washing powder which is an alkali. An alkali is a type of chemical which is the opposite of an acid. As we added the lemon juice to the red cabbage juice it turned pink. Then we added the washing powder which made it turn blue, and then it went back to purple after shaking. It works because red cabbage is an indicator: which means it changes colour when you mix it with acids or alkalis. Some parents thought it was a drink not an experiment, and some guessed which colour it would go. One parent said they would try it at home!
For the other experiment the parents put colourful sweets around the edge of a plate. Then we carefully poured a little bit of water onto the plate. As the parents gazed at the plate the colours slowly spread from the sweeties to the middle. The result was a rainbow of sweetie colours, that also smelt delicious!