The determination of oxalic acid with permanganate follows the reaction: 10I- (a
ID: 843202 • Letter: T
Question
The determination of oxalic acid with permanganate follows the reaction: 10I- (aq) + 2MnO4- (aq) + 16H+ (aq) rightarrow 5I2 (s) + 2Mn2+ (aq) + 8H2O (I) What is the change in oxidation number of manganese? +5 -5 +3 -3 0 Which one of the following items does not characterize a reducing agent? A good reducing agent is a metal in a high oxidation state, such as Mn7+. A reducing agent causes another species to be reduced. The oxidation number of a reducing agent increases. The oxidation number of a reducing agent increases. A reducing agent losses electrons. An example of a good reducing agent is an alkali metal, such as Na. The standard reduction potentials have been determine using _____. A battery A zinc air battery A standard hydrogen electrode A silver/silver chloride electrode The work done on a circuit Electrolysis is defined as: The force pushing electrons through an electrical circuit System that converts chemical energy into electrical work A procedure to correct the calculation of cell potential for non-standard conditions Process in which electrical energy drives a non-spontaneous chemical reaction A concentration cell When the value of Delta Gcell > 0, then Ecell > 0 Ecell 0 and the reaction in the voltaic cell is spontaneous Compare the energy released by the collisions and annihilation of (1) an electron and a positron and (2) a proton and an antiproton. The energy released would be the same. The energy released in (2) would be much greater than that re eased m (1). The energy released in (1) would be much greater than that released m (2). Energy is consumed in these processes, not released. Energy is not released in these collisions. The isotope "belt of stability" is an area in a plot of _____ nuclear binding energy vs. atomic number. isotopic strength vs. isotopic weakness. nuclear mass vs. mass number. neutron number vs. atomic number. mass number vs. atomic number. 175Pt spontaneously decays into 171Os. What is another product of this decay? alpha particle beta particle +1e particle gamma ray He atom A half-life is _____ time that takes to consume half of the initial amount of a stable element. the time for one-half of the unstable nuclei to decay. half of the lifetime of an unstable nucleus. time that takes to consume one-half of a rock independent of the rate constant for decay. The needed particles to balance the reaction are (in order): + ___ rightarrow + ___ rightarrow + 2 ___ Alfa, neutron, positron Neutron, gamma , electron Proton, alfa, gamma Positron, neutron, electron Neutron, alfa, positron In the Bro-with-strokensted-Lowry definition of acids and bases, a base _____ is a proton acceptor. breaks stable hydrogen bonds. is a proton donor. corrodes metals. forms stable hydrogen bonds. Which sketch best represents the qualitative molecular view of an aqueous solution of Hydrochloric acid (strong acid)? (Water molecules are not shown, dark balls are H+.) In the following reaction in aqueous solution, the acid reactant is _____ and its conjugate base product is _____. CH3COOH + NH3 CH3COO- + NH4+ CH3COOH; CH3COO- CH3COOH; NH4+ NH3; CH3COO- NH3; NH4+ CH3COOH; H3O+ The degree of ionization _____ increases with increasing concentration of a weak acid. is independent of the composition of the weak acid. does not change with changing concentration of a weak acid. is not related to the concentration of a weak acid. decreases with increasing concentration of a weak acid. When sodium sulfate is added to a saturated solution of barium sulfate, some of the barium sulfate precipitates. This phenomenon is called _____ supersaturation. the common ion effect. a solubility anomaly. deionization. selective precipitation. What is indicated by the shape of the titration curve? A diprotic acid was titrated with a strong base. A triprotic acid was titrated with a strong base. A diprotic base was titrated with a strong acid. A triprotic base was titrated with a strong acid. A strong acid was titrated with a strong base. Which of the following can be mixed together in water to produce a buffer solution? HClO4 and NaClO4 HNO3 and NaNO3 H2SO4 and NaHSO4 H3PO4 and NaH2PO4 HCl and NaCl The salt solution of a weak acid and strong base: Has pH > 7 Has pH = 7 Has pHExplanation / Answer
1) B
2) A
3) C
4) D
5) C
6) B