The Grand Gel Challenge

Hanin Bearat
Grade Level: 
Arizona State Science Education Standards: 
STRAND 1: Inquiry Process PO1: demonstrate safe behavior and appropriate procedures PO3: conduct a controlled investigation to support or reject a hypothesis PO4: perform measurements using appropriate scientific tools PO5: keep a record of observations, notes, sketches, questions, and ideas using written and/or computer logs STRAND 3: Science in Personal & Social Perspective, Concept 2 (Science & Technology in Society) PO1: propose viable methods of responding to an identified need or problem PO2: compare solutions to best address an identified need or problem PO3: design and construct a solution to an identified need or problem using simple classroom materials STRAND 5: Physical Sciences, Concept 1 PO1: identify different kinds of matter based on physical properties PO2: identify different kinds of matter based on chemical properties PO3: identify types of evidence that a chemical reaction has occurred
This lesson is designed to cover the basics of physical changes and chemical reactions, which is necessary for 8th grade science. It is assumed that the students will not have had exposure to the concepts prior to the lesson. Definitions of physical change and chemical change will be derived through experimentation with some chemical solutions. Examples of these changes of properties will also be discussed in class. Along with the definitions/examples powerpoint presentation, a worksheet will be given to the students to fill out and take notes. The lesson also will explore gels and their applications in the biomedical field. Students will design a gel for a particular medical application and present their findings on a poster to the class. To conclude, a video will be shown on the research and various uses of gels.

The lesson is designed for students to learn the following:
• Characteristics of physical and chemical changes and how to differentiate between them
• How two substances can be combined to form a new one through a chemical reaction
• How different stimuli can cause a physical change to take place, and that it can be reversed
• How motion of particles differ in a gas, liquid or solid state
• Experiment with polymer gels, with both physical and chemical polymer solutions
• Design-a-gel
• Present observations and designed gels to the class

physical change, chemical change, reaction, pH, temperature, gel/hydrogel, biomedical applications.
Lesson instructions.pdf87.12 KB
Lesson Day1_PhysChem Changes.ppt573.5 KB
Lesson#1 worksheet.ppt124 KB
Lesson#1Day2_Gels in medicine.ppt1.71 MB
Lesson plan-1.doc51.5 KB