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Understanding Chemical Equilibrium: Le Chatelier's Principle and Keq Calculation

In this lesson, we focus on calculating the equilibrium constant (K_eq) and understanding Le Chatelier's principle. Students will engage in partner discussions to compare answers on the Le Chatelier worksheet and clarify any doubts regarding the reading material. We will graph concentration vs. time for both completion and reversible reactions. Key topics include deriving the equilibrium expression for the reaction N2(g) + 3H2(g) ⇌ 2NH3(g) and interpreting K_eq values. Remember to complete the assigned homework and check your knowledge on Moodle before the upcoming test on April 2nd.

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Understanding Chemical Equilibrium: Le Chatelier's Principle and Keq Calculation

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  1. Wed, March 17, 2010 • Learning Goal: to calculate Keq • Questions over the LeChatelier Wkst • Questions over the reading • Homework

  2. Happy St. Patty’s Day! • Find a partner and compare answers to the LeChatelier Wkst (with arrows) • What questions do you have?

  3. Questions over the reading(Section 19.2) • Draw 2 graphs of concentration vs time for a completion reaction and a reversible reaction. • What is the formula for Keq? • Write the equilibrium expression for the following reaction: N2 (g) + 3H2 (g)  2NH3 (g) • Calculate the Keq for the reaction in #3 above when [H2]=0.15 mol; [N2]=0.25 mol and [NH3]=0.10 mol • What does it mean if Keq > 1? What if Keq < 1?

  4. Homework: • Finish Equilibrium Wkst (pg one of stapled packet) • Knowledge Checks on Moodle: • LeChatelier Knowledge Check (Sec 19.2) • Open from Wed at 7AM to Friday at 10pm • Reaction Rates and Progression Curve (Sec 19.1 & 19.5) • Reopened from Wed 7AM to Thurs 11:30pm • LeChatelier Lab Quiz – Moodle • Bring labs on Friday • Ch 19 TEST (Sec 19.1, 19.2 and 19.5) on Fri, April 2!

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