Equilibrium
Rate of forward/reverse reactions are equal
What is equilibrium?
You want to convert 32 g Na into moles. What is the conversion factor you would use?
What is (1 mole Na / 22.990 g Na)?
The capacity to do work
What is energy?
How fast molecules interact with one another. Can be altered so it goes faster/slower.
What is rates of reaction?
Good ways to prepare for the exam?
What are reviewing lecture notes, doing practice problems, attending office hours, getting good sleep the night before (!!!).
If your equilibrium constant, K, is less than 1. Where does the equilibrium lie? (Do the reactants or products have a greater concentration?)
What is reactants?
K = [products] / [reactants]
How many grams is in 7 moles of O? (Note: O, NOT O2)
What is 112g O?
grams O = 7 moles O X (16 g O / 1 mole O) = 112 g O!
ΔH less than 0
What is an exothermic reaction?
Something added to a reaction to lower it's inactivation energy, and ISN'T used up in the reaction
What is a Catalyst?
When are Jayden's Office Hours?
What are Thursdays, 2-3 pm?
2H2(g) + O2 (g) -> 2H2O(g).
If you increase the pressure in this reaction, where would the reaction lean? (What would be produced more?)
What is products?
When pressure inc. reaction leans to whichever side has the LEAST # of collective moles of gas (in cases where the moles of gas are different on the reactant and products side)
The mass of an element needed to have one mole of the element. (Hint: has units g/mole)
What is the molar mass?
ΔHrxn = -820 kJ. 1 cal = 4.184 J. What is the Hrxn in kcal?
What is -195.98 kcal?
-820kJ x (1000 J/1 kJ) x (1 cal/4.184 J) x (1 kcal/1000 cal) = -179 kcal
Principle that states that if a chemical system at equilibrium is disturbed or stressed, the system will react in the direction that counteracts the disturbance or relieves the stress
What is Le Chatelier's Principle?
When are Maggie's SI Sessions?
If you increase the temperature in an exothermic reaction, in what direction would the reaction go?
What is the reactants?
(I like to think about this like homeostasis! If you think about a reaction having the Hrxn of -200, and increase the temperature, it will want to produce more reactants to bring the temperature down back to -200!)
How many moles of carbon is in 24 moles of methane? (H3COH)
24 moles of carbon
(1 moles of carbon per 1 moles of methane)
The bonds broken are stronger than the bonds formed
What is an endothermic reaction?
Need to bypass in order to begin a reaction, often noted as an "energy barrier"
What is activation energy?
Besides your LA and SI, what other resources in the Learning Commons can you use for help/practice?
What is peer tutoring and the MASS center?
If you increase the concentration of reactants and decreased the temperature in a reaction, what direction will it go in the reaction?
You have 2 moles of phosphate (PO4)-3 , how many moles of oxygen is there?
(You may remember this from last week's worksheet! ;^) )
8 moles of oxygen in total!
Moles oxygen in moles phosphate = 4:1 ratio
(4 moles O / 1 mole phosphate). So… 2 moles phosphate (4 moles O / 1 mole phosphate) = 8 moles oxygen.
CH4 + 2O2 --> CO2 + 2H2O. You’re given that the ΔHrxn = -213 kcal/mol.
If you had -300 kcal/mol energy produced and CH4 is your limiting reactant, how much (in grams) did you use?
What is 22.54 g
-300 kcal (1 mole CH4/-213 kcal)(16 g CH4 / 1 mole CH4) = 22.54 g CH4
What are some changes you can make to increase the reaction rate?
What is increasing concentration and temperature?
When is the date of Exam 3?
What is Wednesday, October 30?