General Chemistry Questions & Answers

General Chemistry Questions & Answers 2[A]=B+C forward and reverse reactions - CORRECT ANSWER - rate(forward)=kf[A]^2 rate(reverse)=kr[B][C] rate(forward)=rate(reverse) equilibrium Kc=equilibrium constant=([B][C])/[A]^2 Kc=Keq=kf/kr 7 general solubility rules (5,6,7) - CORRECT ANSWER - 5) all metal oxides are insoluble, unless formed with alkali metals, ammonium, and CaO, SrO, and BaO, all of which hydrolize to form hydroxides 6) all hydroxides insoluble with the exception of those formed with alkali metals, ammonium, and Ca 2+, Sr 2+, and Ba 2+ 7) all carbonates (CO3 2-), phosphates (PO4 3-), sulfides (S 2-), and sulfites (SO3 2-) are insoluble unless formed with ammonium or alkali metals 7 general solubility rules (first 4) - CORRECT ANSWER - 1) all salts containing ammonium (NH4+) and alkali metal (group 1) are water soluble 2) all salts containing nitrate (NO3-) and acetate (CH3OO-) anions are water soluble 3) Halides (Cl-, Br-, I-) excluding fluoride, are water soluble, unless paired with Ag+, Pb+, and Hg2 2+ 4) all salts of the sulfate ion (SO4 2-) are water soluble unless paired with Ca 2+, Sr 2+, Ba 2+, and Pb 2+ aA+bB=cC+dD occurs in 3 steps find the equilibrium constant - CORRECT ANSWER - Kc=(k1k2k3)/(k-1k-2k-3)=([C]^c[D]^d)/([A]^a[B]^b) acid dissociation constant and also pka equation - CORRECT ANSWER - Ka=([H+][A-])/[HA] pka=-log(Ka) Acid-dissociation constant and Base-dissociation constant - CORRECT ANSWER - Ka=([H30+][A-])/[HA] this constant is used for weak acids, smaller Ka means its a weaker acid BOH= B+(aq) + OH-(aq) Kb=([B+][OH-])/[BOH] smaller the Kb, the weaker the base