QC 2

Question 1

• A method of analysis that deals with the measurement of spectra

Answer 1

SPECTROMETRY

Question 2

is a system of color bands, it is a continuum of color formed when a beam of light is dispersed, so that its component wavelengths are arranged in order

Answer 2

spectrum

Question 3

• Types of Spectrum

Answer 3

• Color Spectrum
• Electromagnetic Spectrum

Question 4

3 most important Spectrum

Answer 4

o UV
o Visible - color spectrum
o Infrared

Question 5

Shorter wavelength = —— energy= ——— frequency

Answer 5

higher energy = higher frequency

Question 6

Ex. Shorter wavelength

Answer 6

Gamma ray and X-ray

Question 7

Longer wavelength = —— energy= ——— frequency

Answer 7

lower

Question 8

Ex. Longer wavelength

Answer 8

Radio and Microwaves

Question 9

• Determination of the identity of a certain compound

Answer 9

Significance

Question 10

• Determination of the quantity of the active ingredient

Answer 10

Significance

Question 11

• It refers to the length of a complete wave or cycle from the peak of one wave to the peak of the next

Answer 11

Wavelength

Question 12

• refers to the number of waves per second

Answer 12

Wavelength

Question 13

Units of Wavelength

Answer 13

• Micrometer (um) = 10-4 cm
• Nanometer (nm) = 10-7 cm
• Angstrom (Å) = 10-8 cm

Question 14

Ranges of Wavelength Used in Spectrometry

Answer 14

• Far UV - <180nm
• Near UV - 200 to 380 nm
• Visible - 380 to 780 nm
• Near IR - 780 to 3000 nm
• Mid IR - 3 to 15 um
• Far IR - 15 to 300 um

Question 15

• The symbol is “v”

Answer 15

Frequency

Question 16

• It refers to the number of complete cycles which pass a given point per second (cps)

Answer 16

Frequency

Question 17

• It is expressed in cps and hertz (1 cps = 1 Hz)

Answer 17

Frequency

Question 18

• It refers to the number of waves per centimeter

Answer 18

Wavenumber

Question 19

• Units of Wavenumber

Answer 19

• 1 um- = 10’4 cm-
• 1 nm- = 10’7 cm-

Question 20

• It is a functional group which absorbs radiant energy in the UV and visible regions of the spectrum

Answer 20

Chromophore

Question 21

• It refers to the energy in the electromagnetic spectrum that is propagated in waveform

Answer 21

Radiant Energy

Question 22

First theory states that radiant energy occurs in bundles called “——-” or “——–”

Answer 22

photon or quanta

Question 23

• h=

Answer 23

Plank’s constant = 6.62x10-27 ergs . s

Question 24

• v=

Answer 24

frequency = cps or Hz

Question 25

• c=

Answer 25

velocity - 3.00 x 1010 cm/s

Question 26

• V=

Answer 26

frequency - cps or Hz

Question 27

is inversely proportional to energy

Answer 27

Wavelength

Question 28

is directly proportional to the energy

Answer 28

Wavenumber

Question 29

Computation for energy

Answer 29

• E = hv using the frequency
• E = hc/x using the wavelength
• E = hcṽ using the wavenumber