Multiple Choice
Which of the following best describes the difference between a pure substance and a mixture?
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1. Intro to General Chemistry
Classification of Matter
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Which of the following is NOT a molecule?
A
NaCl
B
CO2
C
O2
D
He
Verified step by step guidance1
Step 1: Understand the definition of a molecule. A molecule is formed when two or more atoms are chemically bonded together. These atoms can be the same element or different elements.
Step 2: Analyze each option to determine if it is a molecule. For example, CO2 (carbon dioxide) consists of one carbon atom bonded to two oxygen atoms, so it is a molecule.
Step 3: Consider O2 (oxygen gas), which consists of two oxygen atoms bonded together, making it a molecule as well.
Step 4: Look at NaCl (sodium chloride), which is an ionic compound composed of sodium and chloride ions. Although it forms a crystal lattice, it is not considered a molecule because it does not consist of discrete bonded atoms in a molecule form.
Step 5: Examine He (helium), which is a noble gas existing as single atoms, not bonded to any other atoms. Therefore, He is not a molecule.
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