Unit 2 Quiz

Question 1

spectrophotometry

Answer 1

allows you to measure the absorbance and transmittance of light energy by molecules.

Question 2

Absorb

Answer 2

When light of specific wavelength (color) is passed through a solution, some of the light energy will be absorbed.

Question 3

Transmit

Answer 3

The remaining light energy that is not absorbed when passed through a solution, is detected and expressed on a meter as either percent transmittance (%T) or absorbance (A).

Question 4

Spectrophotometer

Answer 4

Mode button
Digital display
Wavelength knob
Sample holder
0% T-Knob
100% T Knob
Filter switch

Question 5

6 Colors of visible light

Answer 5

Red
Orange
yellow
green
blue
violet

measured in nanometers (nm)

Question 6

Red

Answer 6

620-750 nm

Question 7

Orange

Answer 7

590-620 nm

Question 8

Yellow

Answer 8

570-590 nm

Question 9

Green

Answer 9

500-570 nm

Question 10

Blue

Answer 10

450-500 nm

Question 11

Violet

Answer 11

380-450 nm

Question 12

Electromagnetic Radiation

Answer 12

Visible light is part of a large field of energy that is known as electromagnetic radiation

Question 13

All energy travels through space in a pattern called

Answer 13

waves

Question 14

smaller wavelengths=

Answer 14

higher energy

Question 15

larger wavelengths=

Answer 15

lower energy

Question 16

If an object is red then the white light is hitting it and all the colors but red are being

Answer 16

absorbed but the red light is being transmitted.

Question 17

which color of visible light has the highest energy level?

Answer 17

violet

Question 18

Examples of electromagnetic radiation

Answer 18

microwaves
x-rays
gamma rays
UV light
TV 
radio

Question 19

A spectrophotometer can be utilized to

Answer 19

determine the concentration of a solution using a set of standards of known concentration.

Question 20

A higher concentration means

Answer 20

a larger amount of light will be absorbed.

Question 21

Visible light is only a

Answer 21

small portion of a broad spectrum of available energy called electromagnetic radiation.

Question 22

Electromagnetic Radiation travels in the form of a

Answer 22

wave, with the distance between two crests termed a wavelength.

Question 23

Visible light consists of light wavelengths from approximately

Answer 23

380-720 nanometers.

Question 24

Shorter wavelengths have

Answer 24

higher frequency and higher associated energy.

Question 25

The mode button

Answer 25

is the left button on the top and it switches between the absorption and transmittance modes.

Question 26

The Wavelength control knob

Answer 26

is the circular knob on the right side in the middle part of the spectrophotometer. The wavelength knob is used to change the wavelength.

Question 27

The 100% T Knob

Answer 27

is the circular knob on the right side of the bottom part of the spectrophotometer. It is under the wavelength knob. The 100% T knob controls how much transmittance (or brightness).

Question 28

The 0% T Knob

Answer 28

is the circular knob on the left side of the spectrophotometer on the bottom part. It is to the left of the 100% T knob. The 0% T knob is used to turn the spectrophotometer off and on, and controls the zero control.

Question 29

The Sample Holder

Answer 29

is on the left side on the middle part of the spectrophotometer. You place the test tubes in there.

Question 30

The Filter Switch

Answer 30

is on the left side on the bottom kind of underneath the spectrophotometer.

Question 31

The Digital Display

Answer 31

is on the top part of the Spectrophotometer on the left side next to the mode button. It shows the wavelength, absorbance, transmittance, and a few other things?