AP Chemistry – Class 21

What does this mean?

Date – Monday, October 5th

Lab – Hess’s Law

• what did you find?
• what calculations are necessary to get an answer?
• how do you support that something is true?
• Hess’s Law – when do you use it?

New Material

• Heats of Formation (example)
• Adding / Subtracting
• relationship to Hess’s Law

Exam – Thursday

• Ch 05 concepts
• Unit Objectives posted
• Work-em-out AND Multiple Choice

Homework