Editing Review Homework For Equilibrium Test - Revised 2009
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<br> a1. What is the "silly" (one may even call it "stupid") phrase Mr. <nowiki>McLeod</nowiki> makes us memorize to remember the overarching understanding of Equilibrium?<br> <br> a2. Equilibrium requires a(an) ________________ reaction and a(an) ____________________ system (or container).<br> <br> b. Define Equilibrium: _______________________________________________________________<br> <br> c1. When the reaction is "over" what is the main difference about what is in the reaction bucket if one compares a reversible reaction and an irreversible reaction.<br> <br> <br> <br> c2. What is meant by Dynamic equilibrium?<br> <br> <br> <br> c3. Why are some reactions reversible and some are irreversible (Hint, has to do with amount of reactant matter and Gibbs free energy)<br> <br> <br> <br> <br> d. Equilibrium constant value change if you change the _________________________ and ________________.<br> <br> <br> e. Define Equilibrium positions: __________________________________________________________________<br> <br> f. At equilibrium, do you have more reactants or products if the K = 1000. ______________________<br> <br> <br> g. Write the equilibrium constant expression for the following chemical reaction:<br> 2<nowiki>KClO</nowiki><sub>3(s)</sub> --> 2 KCl<sub>(s)</sub> + 3 O<sub>2 (g)</sub><br> <br> <br> <br> <br> <br> <Br> <br> <br> <br> h. From your notes, what are the 3 important concepts in Equilibrium?<br> 1) <br> <br> 2) <br> <br> 3)<br> <br> <br> ia. Define <nowiki>LeChatelier's</nowiki> Principle:<br> <br> <br> ib. What 2 additional pieces of information (not part of definition) do you need to understand this concept? <Br> 1) <br> <br> 2) <br> <br> ----<br> j. For the chemical reaction,<br> 2 NO<sub>(g)</sub> + 1 O<sub>2(g)</sub> <==> 2 NO<sub>2(g)</sub> + Energy <br> Stress: <u>Decreasing temperature (______________________)</u><br> <br> How rxn tries to remove stress: _________________________________________________<br> <br> Circle: Make more product or more reactant (fill in for pressure changes)__________________<br> <br> Circle: Favoring: Forward rxn or Backward rxn: (fill in for temperature changes) _____________<br> <br> Circle: Shift Equilibrium to: Left(more reactant) or Right (more product)<br> <br> --------<br> <br> k. For the chemical reaction: 2 H<sub>2</sub>S<sub>(g)</sub> <--> 2 H<sub>2(g)</sub> + S<sub>2(g)</sub><br> <br> Stress:<u>Increasing pressure (______________________)</u><br> <br> How rxn tries to remove stress: _________________________________________________<br> <br> Circle: Make more product or more reactant (fill in for pressure changes)__________________<br> <br> Circle: Favoring: Forward rxn or Backward rxn: (fill in for temperature changes) _____________<br> <br> Circle: Shift Equilibrium to: Left(more reactant) or Right (more product)<br> -------<br> <br> <br> l. For the following chemical reaction in the <nowiki>LeChatlier's</nowiki> Principle Lab,:<br> (yellow) 2 <nowiki>CrO</nowiki><sub>4</sub><sup>2-</sup> + 2 H<sub>3</sub>O<sup>+</sup> <==> Cr<sub>2</sub>O<sub>7</sub><sup>2-</sup> + H<sub>2</sub>O (orange)<br> <br> Stress: <u>Adding in <nowiki>NaOH</nowiki> (_______________________________________________________________)</u><br> <br> How rxn tries to remove stress: _________________________________________________<br> <br> Circle: Make more product or more reactant (fill in for pressure changes)__________________<br> <br> Circle: Favoring: Forward rxn or Backward rxn: (fill in for temperature changes) _____________<br> <br> Circle: Shift Equilibrium to: Left(more reactant) or Right (more product)<br> <br> Solution turned: More Yellow or More Orange or No change <br> <br> ---<br> <br> m. At 300.degC, the following chemical reaction reaches equilibrium in a 2.50L container.<br> 3 H<sub>2(g)</sub> + 1 N<sub>2(g)</sub> <==> 2<nowiki>NH</nowiki><sub>3(g)</sub><br> At equilibrium, there are 3.25moles N<sub>2</sub>, 2.75mole H<sub>2</sub>, and 4.25moles NH<sub>3</sub>. What is the equilibrium constant (K) and what are its units. (Hint, make sure sure you write down equilibrium constant expression first)<br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <Br> <br> n. At 25.0deg C, the following chemical reaction occurs in a 0.500L container and has a K=0.0450.<br> 2 H<sub>2(g)</sub> + 1 O<sub>2(g)</sub> <==> 2 H<sub>2</sub>O<sub>(g)</sub><br> At equilibrium, there are 1.49moles H<sub>2</sub> and 3.45moles O<sub>2</sub>. What is the equilibrium concentration of h<sub>2</sub>O? <br> (Hint, make sure sure you write down equilibrium constant expression first)<br><br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <br> <Br> <Br> <Br> o. For reaction 2 <nowiki>SO</nowiki><sub>2(g)</sub> + O<sub>2(g)</sub> <--> 2 <nowiki>SO</nowiki><sub>3(g)</sub><br> a 1.00-L container initially has 3.50 moles of <nowiki>SO</nowiki><sub>2</sub> and 2.00mole O<sub>2</sub>. If 1.30moles of O<sub>2</sub> react to reach equilibrium, what are the equilibrium concentrations of all species and then calculated K (equilibrium constant). Include units of K? <b>2015-2016 DO NOT DO THIS PROBLEM</b><br> <br> <br> <br> <br> <br> <br> <Br> <br> <br> <br> <br> <Br> <br> <Br> <Br> <Br> <br> <br> <br> <br> <br> <br> <Br> <br> <br> <br> <br> <Br> <br> <Br> <Br> <Br> <br> <br> <br> <br> <br> <br> <Br> <br> <br> <br> <br> <Br> <br> <Br> <Br> <Br> Answer:<br> k. K=1.67M<sup>-2</sup><br> L. [H<sub>2</sub>O]<sub>E</sub> = 1.66M<br> m. [SO<sub>2</sub>]<sub>E</sub> = 0.900M, [O<sub>2</sub>]<sub>E</sub> = 0.700M, [SO<sub>3</sub>]<sub>E</sub> = 2.60M, K=11.9M<sup>-1</sup><br> <br>
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