The addition of iodine across C=C double bonds is used as a means of showing degree of saturation of fat and oil molecules. In this activity, students discuss which fats / oils are ‘healthy’, undertake a class experiment and review case studies of obese people to decide who should get the ‘fat’ pill.
Students will understand that:
Sequence of activities
This topic needs to be handled sensitively and teachers will need to pay particular attention to student behaviour during the group discussions about Xenical.
Assessment for learning commentary
The group discussion promotes listening skills and develops coherence in thinking. Peer review, through hearing the group responses to answers, provides students with opportunities to accept or challenge alternative viewpoints. Discussing the case studies and needing to reach agreement promotes active debate.
An assessment of how well individuals understand the learning objectives is given in the written feedback.
For each student
For each group of students
It is the responsibility of the teacher to carry out an appropriate risk assessment.
Investigating fats and oils
Who should get the fat pill?
All are classified as obese. Leanne is the best candidate for Xenical as there is some evidence that this drug is most beneficial for diabetics.
V. Kind, Contemporary chemistry for schools and colleges. London: Royal Society of Chemistry, 2004.