CH 304K 1st Edition Lecture 18 Outline of Last Lecture I. Ozone DestroyersOutline of Current Lecture II. Types of UV RadiationIII. The Chapman CycleIV. Effects of UVV. Sunscreen and SunblockCurrent LectureTypes of UV Radiation- UV Radiation is broken down into three bands- UV-A (320-400nm): also referred to as “black light”; not absorbed by the ozone layer- UV-B (280-320nm): most absorbed by ozone layer- UV-C (200-280nm): absorbed completely by the ozone layer and oxygenThe Chapman Cycle1. Decomposition of oxygen gas to form oxygen atoms2. Formation of ozone from oxygen gas and oxygen atoms3. Decomposition of ozone (reverse of last step)4. Formation of oxygen from ozone and oxygen atom- This cycle created a steady state of dynamic equilibriumEffects of UV- UV causes bonds in molecules to breakThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.- Sometimes cell containing effected molecule dies, but sometimes (in the case of DNA, for example) can mutate which can cause cancer- UV-A: causes premature skin aging and skin cancer- UV-B: causes cataracts, skin cancer, crop damage, affects movements and photosynthesis of marine phytoplankton organisms, damages fish eggs and larvae- UV-C: most damaging to cells; used to sterilize surfaces because it can kill viruses and bacteriaSunscreen- Contains compounds that absorb UV-B and some UV-ASunblock- Contains compounds that reflect and block incident
View Full Document
Unlocking...