Multiple Choice
Which of the following is NOT a molecule?
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1. Intro to General Chemistry
Classification of Matter
Multiple Choice
Which of the following best describes aspirin in terms of the classification of matter?
A
Aspirin is an element because it is made up of only one type of atom.
B
Aspirin is a mixture because it contains different types of molecules.
C
Aspirin is a pure substance because it consists of a single type of molecule (C9H8O4).
D
Aspirin is a heterogeneous mixture because its composition varies throughout.
Verified step by step guidance1
Recall the basic classifications of matter: elements, compounds (pure substances), homogeneous mixtures, and heterogeneous mixtures.
Understand that an element consists of only one type of atom, such as oxygen (O2) or gold (Au).
Recognize that a compound (pure substance) consists of molecules made up of two or more different atoms chemically bonded in a fixed ratio, such as water (H2O) or aspirin (C9H8O4).
Identify that mixtures contain two or more substances physically combined, which can be homogeneous (uniform composition) or heterogeneous (non-uniform composition).
Since aspirin is composed of molecules with the formula C9H8O4, it is a pure substance (a compound) because it contains only one type of molecule, not a mixture or element.
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