(MIDTERM) SPECTROMETRY

Question 1

Science that deals with light and its absorption and emission by
solutions and other material substances.

Answer 1

Spectrometry

Question 2

Light is consist of moving particles, often called _____________

Answer 2

photons or quanta

Question 2

The intensity of transmitted radiant energy is a function of the
concentration of chemical species which absorbs the radiant energy

Answer 2

Spectrometry

Question 2

2 Theories of Radiant Energy

Answer 2

1. Light is consist of moving particles, often called photons
   or quanta.
2. Light is consist of moving electromagnetic
   disturbances, referred to as electromagnetic waves.

Question 2

Light is consist of moving electromagnetic
disturbances, referred to as _________________

Answer 2

electromagnetic waves

Question 2

Equation which relates the enrgy of a photon to the frequency of radiation

Answer 2

Particle Theory of Light

Question 2

mathematical expression of wave theory

Answer 2

Wave Theory of Light

Question 3

refers to energy in UV, visible, and IR regions of the electromagnetic spectrum.

Answer 3

Radiant Energy

Question 3

length of an electromagnetic wave (Greek symbol, 𝜆)

Answer 3

Wavelength

Question 4

the number of the moving electromagnetic waves that
pass a fixed point in 1 sec (Greek symbol, 𝑣)

Answer 4

Frequency

Question 5

380 –780 nm

Answer 5

Visible Near

Question 5

220 –380 nm

Answer 5

Ultraviolet

Question 5

reciprocal of wavelength

Answer 5

Wave number

Question 6

780 –3000 nm

Answer 6

Infrared Medium

Question 7

3.0 –15 μm 15

Answer 7

Infrared Far

Question 8

–300 μm

Answer 8

Infrared

Question 9

Internal Energy

Answer 9

1. Rotational transition
2. Vibrational transition
3. Electronic transition

Question 10

a functional group which absorbs radiant energy in the UV or visible region of the spectrum

Answer 10

Chromophore

Question 11

branch of spectrophotometry in which the absorption measurement is made in the visible region of the spectrum

Answer 11

Colorimetry

Question 12

used to designate instruments
which have the necessary electronics to permit measurement of
radiant power buy which use a filter instead of a prism or diffraction
grating for the purpose of increasing the sensitivity of the
measurement.

Answer 12

Colorimeter and filter photometer

Question 13

introduction of NH2 or
OH to aromatic system, increases the wavelength of absorption.

Answer 13

Bathochromic or red shift (auxochromes)

Question 14

addition of proton to amino
group can reduce conjugation, reduction of wavelength of
absorption.

Answer 14

Hypsochromic shift or blue shift

Question 15

decreases the intensity of absorption

Answer 15

Hypochromic effect

Question 16

increases the intensity of absorption

Answer 16

Hyperchromic effect

Question 17

a plot of the amount of light absorbed by a sample vs. the wavelength of the light

Answer 17

Absorption spectrum

Question 18

the amount of light absorbed

Answer 18

Absorbance

Question 19

aka. Optical density, absorbancy, coefficient

Answer 19

Absorbance

Question 20

Symbolized as A.

Answer 20

Absorbance

Question 21

the amount of light transmitted.

Answer 21

Transmittance

Question 21

a plot of the amount of light transmitted by a sample rather than the light absorbed vs wavelength of the light

Answer 21

Transmission spectrum

Question 22

The ratio of the radiant power transmitted by the solution to the radiant power transmitted by the blank.

Answer 22

Transmittance

Question 23

Symbolized as T.

Answer 23

Transmittance

Question 24

states that the power of a transmitted radiant beam decreases exponentially as the concentration of the solution containing the absorbing chemical species increases arithmetically.

Answer 24

Beer’s Law

Question 24

states that the power of a transmitted radiant beam decreases exponentially as the thickness of the solution containing the absorbing chemical species increases arithmetically

Answer 24

Lambert’s or Bouguer’s Law

Question 25

A

Answer 25

absorbance

Question 25

relates the power of the incident and the transmitted radiant energy to the thickness and concentration of the solution containing the absorbing chemical species

Answer 25

Beer-Lambert or Beer-Bouguer’s Law

Question 26

b

Answer 26

path lenght in cm

Question 26

a

Answer 26

absorptivity

Question 27

c

Answer 27

concentration in g/L or M

Question 28

A plot of absorbance values against a series of known solute concentrations called a ______________ should yield a straight line. From this plot, the unknown solute concentration is determined merely by measuring the absorbance value of the solution and finding the concentration value which corresponds to the measured absorbance value

Answer 28

Beer’s plot

Question 28

E

Answer 28

molar absorptivity