Chemistry in Context
Chemistry in Context
8th Edition
ISBN: 9780073522975
Author: American Chemical Society
Publisher: McGraw-Hill Education
Question
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Chapter 2.7, Problem 2.17CT

(a)

Interpretation Introduction

Interpretation:

The increase in sensitivity of DNA in skin cell with decrease in wavelength of UV light has to be explained.

Concept Introduction:

UV radiations are part of electromagnetic spectrum.  UV radiation is a high energy radiation compared to visible light.  UV rays are of three types based on their energy.  They are low energy UV-A, UV-B with higher energy than UV-A, and higher energy UV-C.  UV radiation is potent enough to cause skin cancer.

(b)

Interpretation Introduction

Interpretation:

The reason for UV-C not causing cancer has to be explained.

Concept Introduction:

UV radiations are part of electromagnetic spectrum.  UV radiation is a high energy radiation compared to visible light.  UV rays are of three types based on their energy.  They are low energy UV-A, UV-B with higher energy than UV-A, and higher energy UV-C.  UV radiation is potent enough to cause skin cancer.

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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 2 Solutions

Chemistry in Context

Ch. 2.13 - Prob. 2.32CTCh. 2 - How does ozone differ from oxygen in its chemical...Ch. 2 - Prob. 2QCh. 2 - Prob. 3QCh. 2 - Prob. 4QCh. 2 - Prob. 5QCh. 2 - Prob. 6QCh. 2 - a. What is a Dobson unit? b. Does a reading of 320...Ch. 2 - Using the periodic table as a guide, specify the...Ch. 2 - Consider this representation of a periodic table....Ch. 2 - Give the name and symbol for the element with this...Ch. 2 - Give the number of protons, neutrons, and...Ch. 2 - Give the symbol showing the atomic number and the...Ch. 2 - Prob. 13QCh. 2 - Assuming that the octet rule applies, draw the...Ch. 2 - Prob. 15QCh. 2 - Consider these two waves representing different...Ch. 2 - Prob. 17QCh. 2 - Prob. 18QCh. 2 - Arrange these types of radiation in order of...Ch. 2 - The microwaves in home microwave ovens have a...Ch. 2 - Ultraviolet radiation is categorized as UVA, UVB,...Ch. 2 - Prob. 22QCh. 2 - Prob. 23QCh. 2 - Prob. 24QCh. 2 - Prob. 25QCh. 2 - The following free radicals all play a role in...Ch. 2 - a. How were the original measurements of increases...Ch. 2 - Prob. 28QCh. 2 - The EPA has used the slogan Ozone: Good Up High,...Ch. 2 - Nobel Laureate F. Sherwood Rowland referred to the...Ch. 2 - Prob. 31QCh. 2 - Prob. 32QCh. 2 - Prob. 33QCh. 2 - Prob. 34QCh. 2 - Prob. 35QCh. 2 - Prob. 36QCh. 2 - The average length of an OO single bond is 132 pm....Ch. 2 - Prob. 38QCh. 2 - Prob. 39QCh. 2 - Prob. 40QCh. 2 - All the reports of the damage caused by UV...Ch. 2 - Prob. 42QCh. 2 - Prob. 43QCh. 2 - Prob. 44QCh. 2 - Development of the stratospheric ozone hole has...Ch. 2 - Prob. 46QCh. 2 - One mechanism that helps break down ozone in the...Ch. 2 - Polar stratospheric clouds (PSCs) play an...Ch. 2 - Prob. 49QCh. 2 - Prob. 50QCh. 2 - Resonance structures can be used to explain the...Ch. 2 - Prob. 52QCh. 2 - Prob. 53QCh. 2 - Many different types of ozone generators...Ch. 2 - The effect a chemical substance has on the ozone...Ch. 2 - Prob. 56Q
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