Spectrophotometry

Question 1

Wavelength

Answer 1

Peak to peak distance btwn waves

Nanometers (10^-6 m)

Question 2

Frequency

Answer 2

Number oscillations per second

1/s or Hertz

Question 3

Photon

Wave number

Answer 3

Packet of light

1/wavelength, in cm^-1

Question 4

APPLICATIONS

1. Infrared
2. UV-visible
3. Microwave
4. Gamma

Answer 4

1. Organic
2. Soil and water analysis
3. Determining structure
4. Mossbaur spec

Question 5

Process of Spectrophotometry

Answer 5

Light is absorbed and molecule promoted to higher energy. Bc this is unstable, energy leaves as light and molecule returns to lowest energy state

Question 6

Irradiance

Answer 6

Energy per second per unit area of the light beam

• intensity of light
• higher absorbable, lowers irradiance

Question 7

Monochromater

Answer 7

Provides one wavelength of light

-prism

Question 8

Monochromatic

Answer 8

One color

Question 9

Beers Law

Answer 9

A = ebc

Absorption
Molar absorptivity
Path length
Concentration

Does well in dilute/low concentrated solutions

Question 10

Absorbance Spectrum

Answer 10

Graph showing Absorbance varied with wavelength

Question 11

Chromophore

Answer 11

Part of molecule that absorbs light

Question 12

Reagent Blank

Answer 12

Has all of the solution except the analyte

Question 13

Calibration Curve

Answer 13

Absorbance verses concentration

Question 14

Sigma MOs

Answer 14

Form from direct overlap of atomic orbitals

Question 15

Pi MOs

Answer 15

Form from side by side bonds of atomic orbitals

Question 16

Nonbonding Orbitals

Answer 16

From lone electron pairs

Question 17

Spectrophotometry

Answer 17

Using light to determine concentration

Question 18

Adduct

Answer 18

Product of an acid base reaction

Question 19

Coordinate Covalent Bond

Answer 19

Bond between a Lewis acid and Lewis base