Connect students directly to the concept in a personal way. Capture students' attention by initiating a group problem-solving activity before delivery of instruction. Begin with a situation that is familiar to students and builds on what they already know. Construct a learning experience that allows diverse and personal student responses. Facilitate the work of cooperative teams of students.

Pass It On Activity

Objective: To illustrate how the spread of STD’s or other diseases may occur when body fluids are shared.

Pass it on: All cups are filled with water except 1, which is filled with NaOH. The person with the NaOH is “infected”. The contents all look the same, so no one knows anyone is infected. Phenolphthalein is used to test the participants’ solutions to see who has become infected.

Assessment: Observe the number of students who test positive (solution turns pink) and discuss.