In this activity, students use mechanism cards to represent the stages in a nucleophilic substitution reaction of an halogenoalkane. The cards act as a prop to foster thinking and discussion about an organic reaction mechanism.
Sequence of activities
Assessment for learning commentary
Questions to examine the students’ observation and grasp of the topic give the teacher an indication of the level of understanding. They give the students a starting point for the activity and help to clarify the learning objective.
By using cards to explore reaction mechanisms, the students confront their own level of knowledge which they further assess by working with a partner.
These assessments are formalised at the end of the session, allowing the teacher to guide the student to additional support.
For each pair of students
Procedure for introductory activity