Multiple Choice
Which of the following are the very small particles that make up matter?
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2. Atoms & Elements
The Atom
Multiple Choice
Which of the following best describes the current composition of Earth's atmosphere by volume?
A
Approximately 78% N_2, 21% O_2, 1% Ar, and trace amounts of CO_2 and other gases
B
Approximately 70% CO_2, 20% N_2, 10% O_2
C
Approximately 50% O_2, 30% N_2, 15% CO_2, and 5% Ar
D
Approximately 90% O_2, 5% N_2, 5% Ar
Verified step by step guidance1
Understand that Earth's atmosphere is primarily composed of gases by volume, with nitrogen (N_2) and oxygen (O_2) being the major components.
Recall that nitrogen makes up the largest portion of the atmosphere, approximately 78% by volume.
Recognize that oxygen is the second most abundant gas, making up about 21% by volume.
Note that argon (Ar) is a noble gas present in smaller amounts, roughly 1% by volume.
Acknowledge that carbon dioxide (CO_2) and other trace gases exist in very small amounts, typically less than 1%, completing the typical composition of Earth's atmosphere.
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