Study Guides (248,527)
United States (123,402)
Chemistry (146)
CHEM 130 (26)
All (7)
Midterm

CHEM 130 EXAM 3 STUDY GUIDE

4 Pages
125 Views
Unlock Document

Department
Chemistry
Course
CHEM 130
Professor
All Professors
Semester
Fall

Description
Exam3Review Chapter14:ChemicalEquilibrium · Chemicalequilibrium: state of reaction mixture when the forward and reverse reactions equal (the reaction have NOT stopped!) · Equilibriumconstant(K ) c c d a b o Kc= C D A B for the reaction aA + bB ↔ cC + dD o A, B, C and D are reactants and products o a, b, c, and d are coefficients in the balanced chemical equation o Kc< 1 reverse reaction favored o Kc= 1 neither direction is favored o Kc˃ 1 forward reaction favored · Equilibriumconstant(K ): an equilibrium constant for a gaseous reaction p in terms of partial pressures o Kp= K (cT) Δn o Δn = c+d-a-b (stoichiometric coefficients for gas reactants and products) · ReactionQuotient(Q) o Expression is the same as equilibrium constant expression but concentration values aren’t those at equilibrium o If Qc> K ,cthe reaction will go to the left o If Qc< K ,cthe reaction will go to the right o If Q = K , the reaction mixture is at equilibrium c c · Calculatingequilibriumconstants o Write the equilibrium constant expression in terms of products and reactants o Always make an ICE table (initial, equilibrium, change) o Substitute ‘change’ expressions (in terms of x) into the equilibrium constant expression and solve o Quadratic equation (NOT listed on PT packet!): · Le Chatelier’sPrinciple: when a system in chemical equilibrium is disturbed by a change of temperature, pressure, or a concentration, the system shifts in equilibrium composition in a way that tends to counteract this change of variable o Add reactants or remove products: reaction shifts to right (more product is produced) o Remove reactants or add products: reaction shifts to left o Decrease volume (which increase pressure): reaction shifts to side with fewer moles of gas o Increase volume: reaction shifts to side with more moles of gas o Endothermic reaction: heat is a reactant, reaction shifts left o Exothermic reaction: heat is a product, reaction shifts right · Effectofacatalyst: catalyst increases the rate of reaction but is NOT consumed in the reaction; catalyst doesn’t affect the equilibrium composition Chapter15:AcidsandBases · AcidandBaseStrength o Strong acids and bases break into their ions completely.  They are strongelectrolytes. o Weak acids and bases remain mainly as molecules or in their formula units. There are sixstrong acids and sixstrong bases you must know: Acids Bases Name Formula Name Formula Hydrochloric acid HCl Lithium hydroxide LiOH Hydrobromic acid HBr Sodium hydroxide NaOH Hydroiodic acid HI Calcium hydroxide Ca(OH) 2 Nitric acid HNO 3 Strontium Sr(OH) 2 hydroxide Sulfuric acid H2SO 4 Barium hydroxide Ba(OH) 2 Perchloric acid HClO 4 Potassium KOH hydroxide ** Hydrofluoric acid (HF)
More Less

Related notes for CHEM 130

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit