Introduction to lab tools and their uses, precision vs. accuracy, and calculating percent error. This is the second lesson of my mini chemistry Unit 0: Measurement which can be purchased as a bundle (and includes a mini lab, full length lab, daily practice assignments, vocabulary list, review, and unit quiz). The unit takes eight 45 minute classes, or four 90 minute classes, and serves as a brief introduction to core chemistry concepts that students will use all year long, providing them with