9-12

E3: Describe the characteristics and behavior of acids and bases?

Curriculum Organizing Questions	What are the key properties of acids? bases? How can the properties of acids and bases, especially pH, be measured? How can the properties of acids and bases be explained by their structure? What happens when acids and based combine?
Elaboration
Specific Ideas
Developmental & Instructional Implications	Interviews of 15 year olds showed misconceptions such as "acids eat material away" and did not preceive the reactions of acids with metals as a proeprty of acids. Driver p. 90. Students are often confused by the several science models of acids and bases because, although words and ideas change their meaning from one model to another, students are not always made aware of this. Driver p. 91. Because the term "base" is less prevalent in daily life than "acid", students are less likely to form preconceptions of bases before instruction. Driver p. 91.
Examples

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