S3.2.1 Structural formulae

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6 Terms

1
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Molecular formula

Actual number of atoms in a compound.

Not simplified.

Used to represent exact composition.

<p>Actual number of atoms in a compound. </p><p>Not simplified. </p><p>Used to represent exact composition.</p>
2
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Empirical formula

Lowest whole number ratio of atoms.

Simplified version.

May not match actual structure.

<p>Lowest whole number ratio of atoms.</p><p>Simplified version. </p><p>May not match actual structure.</p>
3
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Full structural formula

Shows all atoms and all bonds.

Fully expanded.

Useful for visualizing bonding.

<p>Shows all atoms and all bonds. </p><p>Fully expanded. </p><p>Useful for visualizing bonding.</p>
4
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Condensed structural formula

Shows atoms but omits bonds.

Groups atoms together.

More compact representation.

<p>Shows atoms but omits bonds. </p><p>Groups atoms together. </p><p>More compact representation.</p>
5
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Skeletal formula

Only carbon skeleton shown.

H on C atoms omitted.

Used for complex structures.

<p>Only carbon skeleton shown. </p><p>H on C atoms omitted. </p><p>Used for complex structures.</p>
6
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Stereochemical formula

Solid lines lie in plane.

Solid wedge shows bond projecting towards viewer.

Dashed wedge shows bond going away from viewer.

Base orientation for 3D depiction.

<p>Solid lines lie in plane.</p><p>Solid wedge shows bond projecting towards viewer.</p><p>Dashed wedge shows bond going away from viewer.</p><p>Base orientation for 3D depiction.</p>

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