Spectrophotometry
Chemistry ⇒ Analytical Chemistry
Spectrophotometry starts at 12 and continues till grade 12.
QuestionsToday has an evolving set of questions to continuously challenge students so that their knowledge grows in Spectrophotometry.
How you perform is determined by your score and the time you take.
When you play a quiz, your answers are evaluated in concept instead of actual words and definitions used.
See sample questions for grade 12
A student measures the absorbance of a solution at different concentrations and finds a non-linear relationship. What could be a possible reason?
A student prepares a calibration curve by measuring absorbance of standard solutions. What is the purpose of this curve?
Define transmittance in the context of spectrophotometry.
Describe how a calibration curve is constructed in spectrophotometry.
Describe the function of the detector in a spectrophotometer.
Explain why it is important to clean cuvettes before use in spectrophotometry.
Explain why it is important to use a blank solution in spectrophotometric analysis.
A student measures the absorbance of a solution at different concentrations and finds a non-linear relationship. What could be a possible reason?
What is the unit of absorbance? (1) mol/L (2) cm (3) no unit (4) g/L
Which law relates the absorbance of a solution to its concentration and path length? (1) Boyle's Law (2) Beer-Lambert Law (3) Charles's Law (4) Avogadro's Law
Which of the following factors can cause deviation from Beer-Lambert Law? (1) High concentration (2) Stray light (3) Chemical interactions (4) All of the above
Which of the following is a limitation of spectrophotometry? (1) Only colored compounds can be analyzed (2) It cannot be used for quantitative analysis (3) It is not affected by impurities (4) It is only used for gases
A spectrophotometer measures the intensity of light ________ and ________ a sample.
Fill in the blank: The ________ is the part of the spectrophotometer that splits light into its component wavelengths.
Fill in the blank: The ________ is the wavelength at which a substance shows maximum absorbance.
Fill in the blank: The absorbance of a solution is ________ when all the light passes through the sample.
True or False: In spectrophotometry, absorbance increases as the concentration of the absorbing species increases.
True or False: Spectrophotometry can be used to monitor the progress of a chemical reaction over time.
True or False: The absorbance of a solution can be greater than 2.
True or False: The molar absorptivity is a constant for a given substance at a specific wavelength.
