Instrumental Analysis Test 1 Chapters 1,5,6,7 questions
with verified answers
Absorbance Ans✓✓✓ A=log(Po/P)
Absorption induced by a magnetic field Ans✓✓✓ When nuclei or
electrons of certain elements are subjected to a strong magnetic field,
additional quantized energy levels can be ovserved as a consequence of
the magnetic properties of the elementary particles.
Generally very small differences in energy.
Absorption of radiation Ans✓✓✓ When radiation passes through a
layer of solid, liquid, or gas, certain frequencies may be selectively
removed by absorption.
Absorption promotes these particles to excited states. The energy of
the exciting photon must exactly math the energy difference between
the ground state and one of the excited states of the absorbing species.
Absorption/Emission Ans✓✓✓ Either the taking in of energy or the
release of energy when a species changes its state. Exactly equal to the
energy differences between the states.
Analytical sensitivity Ans✓✓✓ 1) takes precision into account
, 2) represented by y
y=m/s(signal)
s(s): standard deviation of the measurement (concentration of interest)
Atomic absorption Ans✓✓✓ Occurs when polychromatic (all possible
wavelengths) radiation passes through a medium that consists of
monoatomic particles (typically in UV-vis range)
Band spectrum Ans✓✓✓ Often encountered in spectral sources when
gaseous radicals or small molecules are present
Beer's Law Ans✓✓✓ A=εbc
A is absorbance
ε is molar absorptivity
c is concentration of the analyte
b is pathlength (thickness of cuvette)
Bias Ans✓✓✓ 1) a measure of the systematic error of an analytical
method
with verified answers
Absorbance Ans✓✓✓ A=log(Po/P)
Absorption induced by a magnetic field Ans✓✓✓ When nuclei or
electrons of certain elements are subjected to a strong magnetic field,
additional quantized energy levels can be ovserved as a consequence of
the magnetic properties of the elementary particles.
Generally very small differences in energy.
Absorption of radiation Ans✓✓✓ When radiation passes through a
layer of solid, liquid, or gas, certain frequencies may be selectively
removed by absorption.
Absorption promotes these particles to excited states. The energy of
the exciting photon must exactly math the energy difference between
the ground state and one of the excited states of the absorbing species.
Absorption/Emission Ans✓✓✓ Either the taking in of energy or the
release of energy when a species changes its state. Exactly equal to the
energy differences between the states.
Analytical sensitivity Ans✓✓✓ 1) takes precision into account
, 2) represented by y
y=m/s(signal)
s(s): standard deviation of the measurement (concentration of interest)
Atomic absorption Ans✓✓✓ Occurs when polychromatic (all possible
wavelengths) radiation passes through a medium that consists of
monoatomic particles (typically in UV-vis range)
Band spectrum Ans✓✓✓ Often encountered in spectral sources when
gaseous radicals or small molecules are present
Beer's Law Ans✓✓✓ A=εbc
A is absorbance
ε is molar absorptivity
c is concentration of the analyte
b is pathlength (thickness of cuvette)
Bias Ans✓✓✓ 1) a measure of the systematic error of an analytical
method
