We entered the final chapter in Unit 1 with the Lesson 25 PowerPoint introducing students to the concept of classifying substances based on properties of matter like conductivity and solubility. After slide 6 in the PowerPoint, students received the Lesson 25 Worksheet and then worked in groups of 5-6 students to test the conductivity and solubility of the substances listed on the worksheet. By the end of class, students had compiled all of the data from the lab into the table on page 2 of the worksheet. Note: rather than build conductivity testers, students used pre-built testers to obtain conductivity results.
Update – 11/17/15: We compiled a class data set from yesterday’s conductivity and solubility tests. A few of the substances had mixed conductivity results across student groups, so we re-tested the conductivity of those substances using a conductivity tester constructed as instructed on page 1 of the Lesson 25 worksheet.