《分析化学B》第4次作业答案(外国英文资料).doc

《分析化学B》第4次作业答案(国外英文资料) 2013-5-3 Friday 16:08:31 In March 24, the year of the snake, analytical chemistry B is the fourth assignment You chose analytical chemistry B this term. Explanation: the total score of this assignment is 42, and your score is 42 Type A question: Please select the best answer from the alternative answer The following parameter is quantitative: B A. retention volume B. peak area C. peak width D.R f E. retention time The following statement is incorrect: C A. Relative error is the proportion of the absolute error in the truth value The deviation is the difference between the measured and the mean The overall mean is the true value D. standard deviation can highlight large deviations The absolute error is the difference between the measured and the true values The following is not the weight analysis required for the weighing form: C A. there is sufficient chemical stability in the air B. there is a larger molar mass C. The form of precipitation is the same The composition is the same as the chemical formula The composition is known and fixed The following explanation is false: B A: the standard electrode potential of Ox/Red The value of the distribution coefficient of the original or oxidation number is less than one C. The value of the active coefficient of an original or oxidized type is less than one D. The conditional potential is the actual potential of an electrooxidation, reductive analysis concentration of 1 molar in a certain condition E The molecular formula of a compound is C8H9NO2 6 A. 4 B. 8 C. 10 D. E. 5 The most powerful of the following solvents in A positive liquid distribution chromatography are: A A. n-butyl alcohol B. ether C. acetone D. methylene chloride E. benzene The greatest displacement of protons in the following compounds is: D A.C H3Cl Biggest H3I Arthur c. H4 , dc H3F H3Br of e.c. with our fabrication: When using GC to analyze the sample, it is used to characterize the component E A. peak width B. peak height The num