Determining the type of acid and base (strong or weak) that decreases in pH at equivalence in a titration experiment.

In a titration experiment, if the initial solution pH is 9.0 and equivalence point occurs at pH 3.0, then the reaction corresponds to a. the titration of a strong acid by a strong base b. the titration of a strong base by a strong acid c. the titration of a weak acid by a strong base d. the titration of a weak base by a strong acid e. the titration of a weak acid by a weak base

equilibria expression

Which of the following is a heterogeneous equilibria expression? a. 2NO(g)+O2(g) (equilibrium sign) 2NO2(g) b. H2(g)+I2(s) (equilibrium sign) 2HI(g) c. 2S(s)+3O2(g) (equilibrium sign) 2SO3(g) d. 2NH3(g) (equilibrium sign) N2(g)+3H2(g) e. both answers b and c

True or false statements on the characteristics of a voltaic cell.

Which of the following statements concerning voltaic cells are false? a. it consists of two half-cells b. it can serve as an energy source c. the two half-cells in a voltaic cell are connected by a salt bridge d. the electrodes in a voltaic cell must be composed of dissimilar metals e. reduction occurs at the cathode in a voltaic cell

Oxidizing Agents

Which species is the best oxidizing agent? a. sodium metal b. sodium ion c. chlorine d. chloride ion e. carbon

Fill in the blank question about the cell voltage in a voltaic cell.

The cell voltage, E, is _________ for a reaction taking place in a voltaic cell. a. negative b. positive c. zero d. oxidative e. reductive