Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
Publisher: Cengage Learning
ISBN: 9781305389892

Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
Publisher: Cengage Learning
ISBN: 9781305389892


Chapter 2, Problem 2TYK
Textbook Problem

Oxygen (O) is a(n) _______; the oxygen we breathe (O2) is a(n) _______; and the carbon dioxide we exhale is a(n) _______.

a. compound; molecule; element

b. atom; compound; element

c. element; atom; molecule

d. atom; element; molecule

e. element; molecule; compound

Expert Solution
Summary Introduction


An element is a pure substance that cannot be broken down into simpler substances, physically or chemically. It is composed of only one type of atoms. There are a total of 118 elements in the periodic table. A molecule is formed when atoms combine in a fixed ratio. Compounds are molecules in which atoms of two or more types are combined in a fixed ratio.

Explanation of Solution

Justification for the correct answer:

Option (e) is element, molecule, and compound. Oxygen is the eighth element of the periodic table. It has atomic number 8 and atomic mass 16. O2 is a molecule as it contains two oxygen atoms in a fixed ratio. Carbon dioxide is a compound as it contains one atom of carbon and two atoms of oxygen in a fixed ratio. Hence, option (e) is correct.

Justification for the incorrect answers:

Option (a) is compound; molecule; element. Oxygen is an element and not a compound and carbon dioxide are not an element, it is compound. O2 is correctly categorized as a molecule. So, it is an incorrect option.

Option (b) is atom; compound; element...

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Chapter 2 Solutions

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