Adiprotic acid, h2a, has acid dissociation constants of ka1=3.58×10−4 and ka2=2.21×10−12. calculate the ph and molar concentrations of h2a, ha−, and a2− at equilibrium for each of the solutions. a 0.175 m solution of h2a. ph = [h2a]= m [ha−]= m [a2−]= m a 0.175 m solution of naha. ph= [h2a]= m [ha−]= m [a2−]= m a 0.175 m solution of na2a. ph= [h2a]= m [ha−]= m [a2−]= m

Which theory was contradicted by experiments with the photoelectric effect? light spreads out after it passes through a small opening. as soon as light strikes metal, electrons will be ejected. visible light, regardless of color, will cause the ejection of electrons when striking metal. the kinetic energy of ejected electrons depends on the frequency of light that strikes the metal.

Insoluble sulfide compounds are generally black in color. which of the following combinations could yield a black precipitate? check all that apply. na2s(aq)+kcl(aq) li2s(aq)+pb(no3)2(aq) pb(clo3)2(aq)+nano3(aq) agno3(aq)+kcl(aq) k2s(aq)+sn(no3)4(aq)

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?