Multiple Choice
Which of the following statements about metals is correct?
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1. Intro to General Chemistry
Chemical Properties
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Why can carbon dioxide (CO_2) be considered a pollutant even though it is a natural component of air?
A
Excess CO_2 from human activities can disrupt Earth's climate by enhancing the greenhouse effect.
B
CO_2 is the primary cause of acid rain.
C
CO_2 reacts with oxygen to form harmful ozone in the lower atmosphere.
D
CO_2 is toxic to humans at any concentration found in the atmosphere.
Verified step by step guidance1
Understand that carbon dioxide (CO_2) is naturally present in the atmosphere and plays a role in Earth's carbon cycle.
Recognize that CO_2 is considered a pollutant not because it is inherently harmful at natural levels, but because human activities have increased its concentration significantly.
Learn that excess CO_2 enhances the greenhouse effect, which traps more heat in the atmosphere and leads to global climate change.
Note that CO_2 itself is not the primary cause of acid rain; acid rain is mainly caused by sulfur dioxide (SO_2) and nitrogen oxides (NO_x).
Understand that CO_2 does not react with oxygen to form ozone in the lower atmosphere, nor is it toxic to humans at typical atmospheric concentrations.
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