1. You have measured the response for a set of 4 method blanks for your method used to measure caffeine in beverages. The blanks give the following response units (0.1121, 0.1176, 0.1132, 0.1211). If the calibration curve equation, where the units of x are ppm caffeine, is y = 0.3761x +0.1150, and we assume that Yblank is to the y-intercept of the calibration line, using a "t"=3, the lowest detectable concentration for this method is: a) 0.0110 ppm b) 0.308 ppm c) 0.0330 mg/L d) -0.273 mg/L e) None of These 2. When a chemical absorbs light, that electromagnetic energy is converted into: a) An increase in the frequency with which the atoms in the bond vibrate b) An increase in the frequency with which the molecule rotates c) An electron being moved into a higher electronic energy state d) Increases in vibrational, rotational, and electronic energy level are all possible for an absorption of electromagnetic energy e) None of these 3. In a calibration curve constructed for a chemical species that follows Beer's Law, the slope of the calibration line represents: a) B b) E*b c) E d) A e) None of These 4. How much energy is contained in 0.0710 moles of 391 nm light? NA = 6.022 x 103, c= 2.998 x 10³ m/sec, h = 6.626 x 104 J*sec. a) 2.17 x 10' J b) 2.17 x 10%) c) 3.61 x 1020 J d) 3.61 x 1029 e) None of These
1. You have measured the response for a set of 4 method blanks for your method used to measure caffeine in beverages. The blanks give the following response units (0.1121, 0.1176, 0.1132, 0.1211). If the calibration curve equation, where the units of x are ppm caffeine, is y = 0.3761x +0.1150, and we assume that Yblank is to the y-intercept of the calibration line, using a "t"=3, the lowest detectable concentration for this method is: a) 0.0110 ppm b) 0.308 ppm c) 0.0330 mg/L d) -0.273 mg/L e) None of These 2. When a chemical absorbs light, that electromagnetic energy is converted into: a) An increase in the frequency with which the atoms in the bond vibrate b) An increase in the frequency with which the molecule rotates c) An electron being moved into a higher electronic energy state d) Increases in vibrational, rotational, and electronic energy level are all possible for an absorption of electromagnetic energy e) None of these 3. In a calibration curve constructed for a chemical species that follows Beer's Law, the slope of the calibration line represents: a) B b) E*b c) E d) A e) None of These 4. How much energy is contained in 0.0710 moles of 391 nm light? NA = 6.022 x 103, c= 2.998 x 10³ m/sec, h = 6.626 x 104 J*sec. a) 2.17 x 10' J b) 2.17 x 10%) c) 3.61 x 1020 J d) 3.61 x 1029 e) None of These
Chapter4: Least-squares And Calibration Methods
Section: Chapter Questions
Problem 1P
Related questions
Question
V2
Transcribed Image Text:1. You have measured the response for a set of 4 method blanks for your method used to measure
caffeine in beverages. The blanks give the following response units (0.1121, 0.1176, 0.1132, 0.1211).
If the calibration curve equation, where the units of x are ppm caffeine, is y = 0.3761x + 0.1150, and
we assume that Yaank is = to the y-intercept of the calibration line, using a "t"=3, the lowest detectable
concentration for this method is:
a) 0.0110 ppm
b) 0.308 ppm
c) 0.0330 mg/L
d) -0.273 mg/L
e) None of These
2. When a chemical absorbs light, that electromagnetic energy is converted into:
a) An increase in the frequency with which the atoms in the bond vibrate
b) An increase in the frequency with which the molecule rotates
c) An electron being moved into a higher electronic energy state
d) Increases in vibrational, rotational, and electronic energy level are all possible for an
absorption of electromagnetic energy
e) None of these
3. In a calibration curve constructed for a chemical species that follows Beer's Law, the slope of the
calibration line represents:
a) B
b) E*b
c) E
d) A
e) None of These
4. How much energy is contained in 0.0710 moles of 391 nm light? Na = 6.022 x 10", c= 2.998 x 10°
m/sec, h = 6.626 x 10 J*sec.
a) 2.17 x 10*J
b) 2.17 x 10)
c) 3.61 x 10 20 J
d) 3.61 x 10)
e) None of These
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 5 steps with 29 images
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Recommended textbooks for you