LeChatelier’s Principle April 10, 2018 LeChatelier’s Principle Kinetics and equilibrium Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Do Now (4 min) April 10, 2018 Learning target: I can predict the shift in a reaction to re-establish equilibrum by using LeChatelier’s principle Do Now: (Answer on your Do Now Sheet) When you get too hot, what does your body do to cool down? When you get too cold, what does your body do to heat up? Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Announcement April 10, 2018 Last tutoring of this marking period - Thursday: 3 – 4:30 PM *Check to make sure you have all of your labs in!!!! Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Part A: LeChatelier’s principle April 10, 2018 Remember, a system (or reaction) at equilibrium is one that has the same rate of the forward reaction as the reverse reaction. EVERYTHING IS IN BALANCE!!!! explains HOW A SYSTEM _______________ WILL RESPOND TO ________________. Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Stressors How do you deal? PAIR DISCUSS April 10, 2018 Stressors How do you deal? Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Shifts April 10, 2018 • STRESS = Any change in CONCENTRATION, PRESSURE, or TEMPERATURE put upon a system at equilibrium. • When a STRESSOR is added to a system at equilibrium, the system will SHIFT in order to relieve that stress and reach a new equilibrium. • SHIFT = an increase in the RATE of EITHER the forward OR the reverse rxn Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Part B: Shifts April 10, 2018 Use your pencil to create a balance Equilibrium More on the right More on the left Balanced Too many PRODUCTS Too many REACTANTS How do you make it go back to equilibrium??? If we shift it: Then, the reaction will favor: Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Part C: different types of stresses April 10, 2018 Read and ANNOTATE the information at the top Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Part C: different types of stresses April 10, 2018 Adding concentration: 4NH3(g) + 5O2(g)  4NO(g) + 6H2O(g) + HEAT Adding H2O is H2O a reactant or product? so, are products or reactants increasing? Use your pencil to figure out shift Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Part C: different types of stresses April 10, 2018 Adding concentration: 4NH3(g) + 5O2(g)  4NO(g) + 6H2O(g) + HEAT Try problems 2-4 in PAIRS 2. If we add O2(g), the system would shift to the _______ and the [NO] would ________. 3. If we add H2O(g), the system would shift to the _______ and the [NO] would ______. 4. If we added NO(g), which concentration(s) would decrease? ____________________. Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Part C: different types of stresses April 10, 2018 Removing concentration: 4NH3(g) + 5O2(g)  4NO(g) + 6H2O(g) + HEAT Removing O2 is O2 a reactant or product? so, are products or reactants decreasing? Use your pencil to figure out shift Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Part C: different types of stresses April 10, 2018 Adding concentration: 4NH3(g) + 5O2(g)  4NO(g) + 6H2O(g) + HEAT Try problems 2-4 in PAIRS 2. If we remove water, the system will shift to the _________ and the [NO] will _________________. 3. If we remove ammonia, which concentration(s) will decrease? ______________________________. 4. If we remove NO(g), which concentration(s) would increase? _______________________________. Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Part C: different types of stresses April 10, 2018 Temperature A + B  C + D + HEAT A + B + energy  C + D heat is a _________________ heat is a _______________   circle one: exothermic / endothermic exothermic / endothermic Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Temperature as a stressor April 10, 2018 In PAIRS, use your understanding of concentration to help you solve: Adding heat: 4NH3(g) + 5O2(g)  4NO(g) + 6H2O(g) + HEAT 1. Is this reaction exothermic or endothermic? _____________________ 2. If we added heat, which concentration(s) will decrease? _____________ 3. If we added heat, which concentration(s) will increase? ______________ Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Temperature as a stressor April 10, 2018 In PAIRS, use your understanding of concentration to help you solve: Removing heat: CO2(g) + H2O(l) + 890.4 kJ  CH4(g) + 2O2(g) Is this reaction exothermic or endothermic? ________________________ If we remove heat, which concentration(s) will decrease? _____________ 3. If we remove heat, which concentration(s) will increase? _____________ Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Pressure as a stressor April 10, 2018 Recall, pressure affects ____________________ ONLY! So every other state (s, l, aq) in the reaction is UNAFFECTED for this type of stress - INCREASE PRESSURE: rxn shifts to side with _________________ # GAS MOLECULES (or least # moles of gas) - DECREASE PRESSURE: rxn shifts to side with _________________ # GAS MOLECULES (or greater # moles of gas) Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Pressure as a stressor April 10, 2018 Gas versus other types of physical states: CO2(g)  CO2(aq) Which side of the rxn has more gases? 1. If we increase the pressure, the concentrations of which species will increase? ________________________ Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

pressure as a stressor April 10, 2018 In PAIRS, solve questions 2 - 4 2. If we increase the pressure, the concentrations of which species will decrease? ________________________ 3. If we decrease the pressure, the concentrations of which species will increase? ________________________ 4. If we decrease the pressure, the concentrations of which species will decrease? ________________________ Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

pressure as a stressor April 10, 2018 Gas molecules on both sides: N2(g) + 3H2(g)  2NH3(g) Which side of your rxn has greater gas molecules? 1. If we increase the pressure, in which direction will the equilibrium shift? (Count moles of gases on each side 1st): ______________________________________ Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

pressure as a stressor April 10, 2018 In PAIRS, solve questions 2 - 4 2. If we increase the pressure, the concentration of which species will increase initially? ___________________ 3. If we decrease the pressure, the concentration of which species will decrease initially? __________________ 4. If we decrease the pressure, the concentration of which species will increase initially? __________________ Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Work on the following regents questions in PAIRS Pairwork April 10, 2018 Work on the following regents questions in PAIRS Make sure you ANNOTATE the questions as you work. If not complete, complete for homework. Due tomorrow. Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

Due Tomorrow, April 25 Homework Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names

April 10, 2018 Exit ticket (3 min) EXIT TICKET: Complete on a separate sheet of paper For the following reaction, which way will the reaction shift with an increase in concentration of H2? 3H2 (g) + N2 (g)  2NH3 (g) Learning Target: I can draw organic compounds from formulas and determine the formula of organic compounds from the names