Analytical Chemistry Exam 1 2025 Questions and Answers

Analytical Chemistry Exam 1 2025
Questions and Answers


Measuring a Physical Property


(INSTRUMENTAL) - --Answer ---mass or volume


-density

-refractive index

-freezing point depression

-thermal conductivity

Using Electromagnetic Radiation: spectroscopy


(CLASSICAL) - --Answer ---absorption


-emission

-scattering


Measuring an Electrical Charge or Current - --Answer ---electrical potential:

pH meter

-electrical conductivity


....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1

, -mass spectrometry


Accuracy - --Answer --how close to a measurement comes to the true value


Precision - --Answer --how reproducibly a measurement can be made


Uncertainty - --Answer --an estimate combining predicted accuracy and

precision


Calibration - --Answer --Using a standard of known composition to ensure

that a method or procedure is accurate


Systematic Errors - --Answer ---errors identified by calibration


-result differs from true value by a fixed amount (might change day to day)

-difference between a measurement and the true value


One-point calibration - --Answer --assumes signal and conc.


Calibration curve (working curve) - --Answer --multiple standards


Internal standard - --Answer ---goes thru all sample processing steps


-added directly to the sample test portion and measured simultaneously with target

analyte

-spike is surrogate




....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 2