Science - A binding contract

20th January 2012 at 00:00

What the lesson is about

My senior students have switched off, so I tell them we are going to produce two contracts, one for me and one for them, writes Sarah Longshaw. I aim to produce variety in lessons and homework tasks, and they want rewards. They agree to cooperate, do homework and to believe "I can". We sign our contracts.

I have to deliver variety now. We start by making Molymod models of alkenes and then connect them to make polymers. We summarise our findings with brief sentences and drawings. We make paper chains, writing the name of a monomer (propene) on each link and then joining them together to form polypropene. We practise naming polymers given the monomer and vice-versa; we draw the structural formulae.

Taking it further

The lesson moves towards disposal of plastics. "Why not burn them?" So we do. As the smoke clears, we discuss combustion and compare complete and incomplete combustion. We write the word "equations". We decide plastics can be recycled and, with a bag of plastic "rubbish", we examine the codes that tell us the different types. We fill in a worksheet from TES Resources that requires students to look up answers to nine questions from the topic and put them on the grid. Anyone who finishes gets a raffle ticket. They look in the textbook, remembering how to use the index, cooperate and complete the activity.

What else?

For a fun, musical way to revise variables, try baibel's Variables Song. Or activate the investigator in every pupil with mad.scientist's hovering paperclip challenge. Jacqui1974 shares a fun "slime-making" activity for a polymers practical.

Subscribe to get access to the content on this page.

If you are already a Tes/ Tes Scotland subscriber please log in with your username or email address to get full access to our back issues, CPD library and membership plus page.

Not a subscriber? Find out more about our subscription offers.
Subscribe now
Existing subscriber?
Enter subscription number


The guide by your side – ensuring you are always up to date with the latest in education.

Get Tes magazine online and delivered to your door. Stay up to date with the latest research, teacher innovation and insight, plus classroom tips and techniques with a Tes magazine subscription.
With a Tes magazine subscription you get exclusive access to our CPD library. Including our New Teachers’ special for NQTS, Ed Tech, How to Get a Job, Trip Planner, Ed Biz Special and all Tes back issues.

Subscribe now