Potatoes to plastic: Cross curricular opportunities

In the third and final post in this series linked to CIEC's latest free resource Potatoes to plastic, Jane Winter explains how it can be used to make meaningful cross curricular links.

The OFSTED report, Maintaining Curiosity, confirmed what experienced teachers already knew, it can be beneficial to both subjects when meaningful cross curricular links are made. However, it is important to do this in a way that values both subjects rather than using one as little more than a vehicle for the other.  In English lessons the teacher should be concentrating on English learning objectives and in science upon science learning objectives. One of my pet hates is when schools, with the very best of intentions, insist that writing has to be as good in other subjects as it is in English. We don't need Vygotsky's zone of proximal development theory to tell us that children are able to do more with support than they are able to do independently. The level of writing in an English lesson is achieved because of skilled teacher support which is not available in a lesson where the teacher's energy is focused on other skills.  Having said that, I have seen great writing about science which has been done in a subsequent English lesson, the children's writing benefiting from an inspirational science experience.

It is important to give children the support that they might need with English during science lessons, but this should not be at the expense of good quality science teaching.

With the value of cross curricular approaches in mind Potatoes to plastic has suggestions for a series of lessons which can be used for English teaching.  They are designed so that the teacher concentrates upon the English learning objectives, and is not trying to juggle too many plates at once.  However, the content is likely to raise children's science capital as it is based upon the biographies of six of the scientists currently working in the award winning Green Chemistry department at the University of York.  Although the focus of the lesson is on reading and writing children learn about the range of exciting jobs that the scientists do, and also find out that scientists are 'normal' people, just like you or I with families and hobbies beyond science.

When reading about real scientists in an English lesson children learn that scientists are normal people with a range of activities and hobbies, from making lego models with their children to enjoying skiing.

The final section of this free publication concentrates upon the range of other solutions to the problem of waste that scientists have developed, from extracting citronella from orange peel to turning cocoa husks into paper bags.  There are a set of downloadable playing cards which can be used for a range of games including 'Memory pairs', 'Old Fossil' and 'Go Recycle' which highlight science solutions to environmental problems.  These could be used as an activity during a science or environmental day.  Alternatively, the link and game instructions could be shared with families so that the cards could be used at home.

The previous two blog posts in this series are still available.  You can find the one about extracting starch from potato peel here, and the one about making bio-plastic from potato peel here.  If you use any of the activities we would love to hear how you get on.  It is feedback from teachers like you that helps us to know what we are doing right and how we can get even better in the future!  

Full instructions for the English activities and the card games as well as how to turn potato peel into bio-plastic are included in this free to download publication

This is what one teacher had to say after using this resource with their class.

Our current topic is all about Endangered Species and a large part of this has been around the dangers of plastics in the oceans and different habitats; so this lesson in particular was a great experience for cross-curricular discussions, the content of which were deep and enriched. In addition to this, the vocabulary resources that accompanied the investigation were a fantastic tool to help deepen the children's understanding and allowed them to speak freely, scientifically and accurately about the processes they were undertaking. Both pupil and teacher thoroughly enjoyed the lesson.

 

Potatoes to plastic: Extracting starch from potato peel

This is the first in a series of three posts which have been written by one of our advisory teachers, Jane Winter.  They are based upon our latest free resource: Potatoes to Plastic

Frequently, scientists are the bearer of bad news.  Every day we read about mounting evidence of climate change, loss of bio-diversity and the prevalence of micro-plastics in the ocean. However, did you know that as well as identifying environmental problems scientists are able to develop solutions to some of them?  The world leading Centre of Excellence in Green Chemistry where scientists work on finding new ways to overcome ecological issues is based at the University of York.

CIEC has been working with some of the scientists from Green Chemistry to develop our latest resource, Potatoes to Plastic which looks at how scientists have been able to develop useful products from a range of waste materials which might otherwise go to landfill.  As well as looking at several examples of this scientific approach to environmental problems, this free publication looks at one example, making bio-plastic from potato peel, in more depth.  Teachers are supported to carry out some straight forward activities with their class which link closely to the materials strand of the KS2 science program of study.  They extract starch from a waste product, potato peel, and then turn that starch into plastic.

Extracting starch from potato peel does not require a lot of expensive equipment. 

I have found the raw material for this activity easy to source.  Although not all chip shops peel their own potatoes, once you find one that does they will almost certainly be prepared to let you have the peel for free. Alternatively, you may find that your school dinner provider is able to give you some.  Another possibility is to use wrinkly old potatoes that have started to sprout and which might otherwise have been thrown away.

Blending the potato peel with water

First of all you will need to blend the peel and a generous quantity of water in a food processor or blender. Give each pair of children a small jug full of the mixture each.  They will need to filter the peel and water mixture by squeezing it through the foot of an old pair of tights or pop socks.  This will produce a white liquid which is a mixture of potato starch and water.  The rest of the solids are left behind and can be disposed of on a compost heap.

Pouring the blended potato peel and water into a pop sock.

After a few minutes the potato starch will start to settle at the bottom of the container.  Once this has happened the water can be poured carefully off to leave behind the wet starch.  At this point children will be amazed to find that they are left with 'oobleck' which is usually made by mixing cornstarch and water.  That is because the starch found in potatoes is exactly the same as starch found in corn.  Once children have finished playing with the oobleck it will need to be left in a shallow container such as a saucer or petri dish to dry.  After a few days all of the water will have evaporated and you will be left with dried potato starch.  

In the next post I will explain how you can turn the potato starch into plastic.  However, if you cannot wait why not check out the full instructions for both activities on the website.  This includes teachers' notes, children's activity sheets and health and safety advice.  This is what one teacher who recently carried out the activity with their class had to say about it.

'Absolutely fantastic! The children have never felt so alive, enthused and engaged in a science lesson that I have taught. They absolutely loved the practical element of blending the potatoes, filtering the starch and using interesting 'ingredients' to create the plastic. Their scientific skills were so clear and they were all extremely careful in measuring their resources and ensuring the investigation plan was carefully followed. The time taken for the excess water to evaporate and leave the powdered starch behind kept them even more engaged as they spoke about nothing for days until it was ready to use'.