Unit 1: Reaction Kinetics Lesson 1: Introduction

Let’s Begin with a Question... Endothermic reactions absorb heat energy – they require energy input in order to proceed. Exothermic reactions, on the other hand, release heat energy. Burning a match is an exothermic reaction, so why don’t matches spontaneously combust? This and many other questions can be answered by the power of reaction kinetics!

Calculating Reaction Rates Example: If 16 g of HCl are used up after 12 min in a certain reaction, then what is the average reaction rate?

Your turn: If a reaction between CaCO3 and HCl produces 245 mL of CO2 in 17 s, what is the average reaction rate? Hone your skills: Pg. 2 #1-5. 15 min

Brain Break!

Measuring Reaction Rates: A Demo Time (s) Mass (g) 10 20 30 40 50 60 70 80 Demo 12.I.1

Mass (g) Time (s)

Methods of Measuring Reaction Rates Consider the following unbalanced exothermic reaction: Cu(s) + HNO3(aq) → Cu(NO3)2(aq) + H2O(l) + NO2(g) red colourless blue brown Think-Pair-Share: What are four possible ways you could measure reaction rate? TPS on 4 ways to measure rate (mass, colour intensity, temp, and pressure)

Homework: Pg. 2 #1-5 (if not already finished) and pg. 5 #8-9.