Multiple Choice
Which element is the most abundant by mass in the human body?
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1. Intro to General Chemistry
Chemical Properties
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Which of the following compounds is NOT involved in the depletion of stratospheric ozone?
A
CO_2
B
NO_x (nitrogen oxides)
C
Cl_2 (chlorine gas)
D
CCl_2F_2 (dichlorodifluoromethane)
Verified step by step guidance1
Understand the context: The depletion of stratospheric ozone primarily involves compounds that release reactive species capable of breaking down ozone molecules (O_3) in the stratosphere.
Identify the key players in ozone depletion: Nitrogen oxides (NO_x), chlorine gas (Cl_2), and chlorofluorocarbons like CCl_2F_2 are known to participate in catalytic cycles that destroy ozone.
Recall the role of NO_x: Nitrogen oxides catalyze ozone destruction through reactions that convert ozone into oxygen molecules, especially in the stratosphere.
Recall the role of chlorine compounds: Cl_2 and CCl_2F_2 release chlorine radicals upon photodissociation, which then catalytically destroy ozone molecules.
Analyze CO_2: Carbon dioxide (CO_2) is a stable molecule that does not produce radicals or reactive species that break down ozone, so it is not involved in ozone depletion.
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