New draft Experiences and Outcomes within Materials - Chemical Reactions 

Gloop       Activity challenge   

Draft Outcome

I have developed my skills in questioning, observation and recording by taking part in activities, which demonstrate simple chemical reactions safely using everyday ‘kitchen chemicals’   SCN 233Z 

 Chemical Reactions - Gloop

To make Gloop you will need: 1 cup of corn flour, water to mix and food colouring. Add the water and food colouring slowly, to the cornflour, a little at a time, until it becomes a thick batter.

Mix the ingredients together in a large bowl, using your hands .Once combined, try to roll it, punch it, dribble it, throw it about! It's advisable to wear an apron when making Gloop. However, it is not recommended that the mixing of the ingredients be done around those that suffer from respiratory complaints such as asthma as the dust from the cornflour can irritate.

Why does the Gloop behave like this? Cornflour is made up of lots of long, stringy particles that don't dissolve in water. However, they do spread themselves out, which allows the Gloop to act as both a solid and a liquid. When you roll the mixture in your hands or apply any force to it, the particles join together and the Gloop becomes solid. But if you let the Gloop settle or hold it up to allow gravity to come into play, it dribbles about as the particles slide over each other in liquid form.

Activity Challenge

Describe how the Gloop feels when you put your hand into it.
What happens when you try to roll it into a ball?
What happens when you stop rolling?
Put some onto a plate. Drop a penny onto it, what happens? How does this compare to water? What would happen if you smack the Gloop with your hand?

Materials - Chemical Reactions - Colour changing milk