Preparing for your ACS examination in general chemistry
98th Edition
ISBN: 9780970804204
Author: Lucy T Eubanks
Publisher: ACS DIVCHED EXAMINATIONS INST.
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Chapter DY, Problem 22PQ
Interpretation Introduction
Interpretation:
A certain reaction has a
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In the video, we looked at the absorbance of a certain substance and how it varies
depending on what wavelength of light we are looking at. Below is a similar scan of a
different substance. What color BEST describes how this substance will appear?
Absorbance (AU)
Violet
Blue
Green
Orange
1.2
1.0-
0.8-
0.6-
0.4-
0.2
0.0
450
500
550
600
650
700
Wavelength (nm)
violet
indigo
blue
green
yellow orange
red
Red
O Cannot tell from this information
In the above graph, what causes -450 nm wavelength of light to have a higher
absorbance than light with a -550 nm wavelength? Check all that are true.
The distance the light travels is different
The different data points are for different substances
The concentration is different at different times in the experiment
Epsilon (molar absortivity) is different at different wavelengths
5. a. Data were collected for Trial 1 to determine the molar mass of a nonvolatile solid solute when dissolved in cyclo-
hexane. Complete the table for the analysis (See Report Sheet). Record calculated values with the correct number
of significant figures.
B. Freezing Point of Cyclohexane plus
Calculation Zone
Unknown Solute
2. Mass of cyclohexane (g)
10.14
Part C.4
3. Mass of added solute (g)
0.255
C. Calculations
1. k; for cyclohexane (°C⚫ kg/mol)
20.0
2. Freezing point change, AT, (°C)
3.04
Part C.6
3. Mass of cyclohexane in solution (kg)
4. Moles of solute, total (mol)
Show calculation.
5. Mass of solute in solution, total (g)
6. Molar mass of solute (g/mol)
Show calculation.
Chapter DY Solutions
Preparing for your ACS examination in general chemistry
Ch. DY - Prob. 1PQCh. DY - Prob. 2PQCh. DY - Prob. 3PQCh. DY - Prob. 4PQCh. DY - Prob. 5PQCh. DY - Prob. 6PQCh. DY - Prob. 7PQCh. DY - Prob. 8PQCh. DY - Prob. 9PQCh. DY - Prob. 10PQ
Ch. DY - Prob. 11PQCh. DY - Prob. 12PQCh. DY - Prob. 13PQCh. DY - Prob. 14PQCh. DY - Prob. 15PQCh. DY - Prob. 16PQCh. DY - Prob. 17PQCh. DY - Prob. 18PQCh. DY - Prob. 19PQCh. DY - Prob. 20PQCh. DY - Prob. 21PQCh. DY - Prob. 22PQCh. DY - Prob. 23PQCh. DY - Prob. 24PQCh. DY - Prob. 25PQCh. DY - Prob. 26PQCh. DY - Prob. 27PQCh. DY - Prob. 28PQCh. DY - Prob. 29PQCh. DY - Prob. 30PQ
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