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stry: Ch x gC C fi https://session. masteringchemistry.com 657396398 offset next Apps UF UF U. PALAA Mastering Chemistry CHM1025: Introductory Chemistry (online), Summer B 2016 Help Close Resources T nversionS Exercise 2.124 previous l 3 of 15 l next Exercise 2.124 A NASA satellite showed that in 2012 the ozone hole over Antarctica had a maximum surface area of 21.5 million km2. The largest ozone hole on record occurred in 2006 and had a surface area of 29.7 million km2 A layer of ozone gas (a form of oxygen) in the upper atmosphere protects Earth from harmful ultraviolet radiation in sunlight. Human-made chemicals react with the ozone and deplete it, especially over the Antarctic at certain times of the year (the so-called ozone hole). The region of low ozone concentration in 2006 (represented here by the dark purple color) was the largest on record. Part A Calculate the difference in diameter (in meters) between the ozone hole in 2012 and in 2006. (Assume ozone holes are circles.) Express your answer with the appropriate units. Value Units Submit My Answers Give Up 8:49 PM Search the web and Windows 7/19/2016

Explanation / Answer

SA1 = 21.5*10^6 km^2

SA1 = pi*r1^2

21.5*10^6 = pi*r1^2

r1 = 2616 km = 2.616*10^6 m

diameter, d1 = 2*r1 = 5.232*10^6 m

SA2 = 29.7*10^6 km^2

SA2 = pi*r2^2

29.7*10^6 = pi*r2^2

r2 = 3074.7 km = 3.075*10^6 m

diameter, d2 = 2*r2 = 6.15*10^6 m

differebce = (6.15 - 5.232)*10^6 m = 9.18*10^5 m

Answer: 9.18*10^5 m

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