Requirement 3: Consider the structure of 1-bromobutane. If compare the structures of BrCH₂CH₂CH₂CH3 and CH3CH₂CH₂CH₂Br, they look different. Sometimes, we are given two identical structural formulas that are drawn differently, and we must recognize they are identical and classify them accordingly. In other words, two compounds with the same molecular formula may not be isomers; they may be the same compound. Thus, when we encounter two compounds with the same molecular formula, we must determine if the molecules represent the same compound or isomers. Consider 1-bromobutane written as BrCH₂CH₂CH₂CH3 and as CH3CH₂CH₂CH₂Br. If you rotate one of the molecules by 180°, it will match atom-per-atom with the other molecule. Two compounds are identical only if their molecules match atom-per-atom in three dimensions. When two molecules with the same molecular formula match atom-per-atom in three dimensions, they are superposable. Superposable means that, when one molecule is placed on top of another molecule, the atoms match perfectly. If the atoms do not match perfectly, they are isomers. Are these models identical? (G) Do they represent identical or different compounds?_(H)_ Let's review our thought processes. We are given two compounds to classify. First, we determine whether the two structures have identical molecular formulas. If they do not have the same molecular formula, they represent different compounds. If they have the same molecular formulas (the exact same number and kind of atoms), they may be identical compounds or isomers. If the structures of two molecules with the same molecular formulas are superposable, they represent the same compound. If they do not match atom-per-atom, they represent isomeric compounds. See Table I.
Requirement 3: Consider the structure of 1-bromobutane. If compare the structures of BrCH₂CH₂CH₂CH3 and CH3CH₂CH₂CH₂Br, they look different. Sometimes, we are given two identical structural formulas that are drawn differently, and we must recognize they are identical and classify them accordingly. In other words, two compounds with the same molecular formula may not be isomers; they may be the same compound. Thus, when we encounter two compounds with the same molecular formula, we must determine if the molecules represent the same compound or isomers. Consider 1-bromobutane written as BrCH₂CH₂CH₂CH3 and as CH3CH₂CH₂CH₂Br. If you rotate one of the molecules by 180°, it will match atom-per-atom with the other molecule. Two compounds are identical only if their molecules match atom-per-atom in three dimensions. When two molecules with the same molecular formula match atom-per-atom in three dimensions, they are superposable. Superposable means that, when one molecule is placed on top of another molecule, the atoms match perfectly. If the atoms do not match perfectly, they are isomers. Are these models identical? (G) Do they represent identical or different compounds?_(H)_ Let's review our thought processes. We are given two compounds to classify. First, we determine whether the two structures have identical molecular formulas. If they do not have the same molecular formula, they represent different compounds. If they have the same molecular formulas (the exact same number and kind of atoms), they may be identical compounds or isomers. If the structures of two molecules with the same molecular formulas are superposable, they represent the same compound. If they do not match atom-per-atom, they represent isomeric compounds. See Table I.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:Requirement 3: Consider the structure of 1-bromobutane. If compare the structures of
BrCH₂CH₂CH₂CH3 and CH3CH₂CH₂CH₂Br, they look different. Sometimes, we are given
two identical structural formulas that are drawn differently, and we must recognize they are
identical and classify them accordingly. In other words, two compounds with the same molecular
formula may not be isomers; they may be the same compound. Thus, when we encounter two
compounds with the same molecular formula, we must determine if the molecules represent the
same compound or isomers. Consider 1-bromobutane written as BrCH₂CH₂CH₂CH3 and as
CH3CH₂CH₂CH₂Br. If you rotate one of the molecules by 180°, it will match atom-per-atom
with the other molecule. Two compounds are identical only if their molecules match
atom-per-atom in three dimensions. When two molecules with the same molecular
formula match atom-per-atom in three dimensions, they are superposable.
Superposable means that, when one molecule is placed on top of another molecule, the atoms
match perfectly. If the atoms do not match perfectly, they are isomers. Are these models
identical? (G)_ Do they represent identical or different compounds?_(H)_
Let's review our thought processes. We are given two compounds to classify. First, we
determine whether the two structures have identical molecular formulas. If they do not have the
same molecular formula, they represent different compounds. If they have the same molecular
formulas (the exact same number and kind of atoms), they may be identical compounds or
isomers. If the structures of two molecules with the same molecular formulas are superposable,
they represent the same compound. If they do not match atom-per-atom, they represent isomeric
compounds. See Table I.
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