Multiple Choice
How many hydrogen atoms are present in a molecule of acetic acid (CH3COOH)?
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3. Chemical Reactions
Molecular Formula
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Which of the following best describes the smallest unit of a chemical compound that still retains the properties of that compound?
A
Molecule
B
Element
C
Ion
D
Atom
Verified step by step guidance1
Understand the question is asking about the smallest unit of a chemical compound that retains the properties of that compound.
Recall that an element is a pure substance consisting of only one type of atom, so it does not describe a compound.
Recognize that an atom is the smallest unit of an element, not a compound, so it cannot represent a compound's smallest unit.
Know that an ion is an atom or molecule with a net electric charge, but it does not necessarily represent the smallest unit of a compound retaining all its properties.
Identify that a molecule is a group of atoms bonded together representing the smallest unit of a chemical compound that retains the compound's properties.
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