Glue made from MILK!

We are learning to observe carefully like a scientist. 

We are building our noticing muscles. 

We have been learning about physical and chemical changes in science. We created glue out of  milk. To do this we needed to create a chemical change. We all thought this was quite strange. 

 We warmed the milk with some vinegar and it curdled and separated.  

Charlotte and Claire using their noticing muscle.
The whey is dripping through the cloth to leave the curd.

Squeezing out all the whey

What happens when baking soda combines with the curd?
The curd is full of a protein called casein.  

Jack and Tyler working together.

Will the milk turn into glue? 

Many years ago people made glue out of many different ingredients: milk and flour, sap from trees, boiled up animal bones and hides. The glue we were making was first made in Egypt for boat building. It is called casein glue. 

This was a chemical change because the particles in the substance changed. We saw evidence of the chemical change when the solid and liquid separated.

Yay, our glue worked.