Condensed Structural Formula
Condensed Structural Formula - Related Videos
02:52
Chemical Formulas
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2020
A chemical formula presents information about the proportions of atoms constituting a particular chemical compound or molecule, mainly using symbols of elements and numbers. At times other symbols, such as dashes, parentheses, brackets, commas, plus, and minus signs, are also used. A chemical formula can be one of three types – molecular, empirical, and structural. Molecular Formula The molecular formula represents a molecule or a chemical compound using chemical symbols (to indicate the...
07:05
Determining the Empirical Formula
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2023
Source: Laboratory of Dr. Neal Abrams - SUNY College of Environmental Science and Forestry Determining the chemical formula of a compound is at the heart of what chemists do in the laboratory every day. Many tools are available to aid in this determination, but one of the simplest (and most accurate) is the determination of the empirical formula. Why is this useful? Because of the law of conservation of mass, any reaction can be followed gravimetrically, or by change in mass. The empirical...
03:34
Ionic Compounds: Formulas and Nomenclature
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2020
An element composed of atoms that readily lose electrons (a metal) can react with an element composed of atoms that readily gain electrons (a nonmetal) to produce ions through complete electron transfer. The compound formed by this transfer is stabilized by the electrostatic attractions (ionic bonds) between the oppositely charged ions. Moving from the far right to the left on the periodic table, nonmetal elements often gain electrons to form anions with the same number of electrons as an atom...
01:33
Aldol Condensation vs Claisen Condensation
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2025
Aldol condensation is an acid or base-catalyzed condensation between aldehydes or ketones to give an α,ꞵ-unsaturated carbonyl compound. A base-promoted condensation between ester molecules to produce a ꞵ-ketoester is known as the Claisen condensation. In the presence of a base, both reactions involve deprotonation of the acidic α hydrogen to produce the corresponding enolates. The nucleophilic enolates attack their respective nonenolized carbonyl compound forming a tetrahedral intermediate.
03:10
Molecular Compounds: Formulas and Nomenclature
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2020
Molecular compounds or covalent compounds result when atoms share electrons to form covalent bonds. Since there is no electron transfer, molecular compounds do not contain ions; instead, they consist of discrete, neutral molecules. Since covalent compounds are formed from the combination of nonmetals, the periodic table can help recognize many of them. The position of a compound’s elements in the periodic table can predict whether the compound is ionic or covalent (although there are...
FAQs
Parentheses show that the enclosed group is attached as a branch to the atom or group written immediately before it. This prevents a branched structure from being mistaken for a longer unbranched sequence. When interpreting a formula, first follow the main sequence, then connect each parenthetical group to its preceding attachment point to reconstruct the molecule’s connectivity.
Specific atom groupings provide clues about a molecule’s functional features. For example, an OH grouping can be located directly within the condensed sequence rather than inferred from a complete bond drawing. Recognizing these groupings helps chemists classify organic molecules and anticipate how their structures may influence participation in chemical reactions.
Structural isomers contain the same constituent atoms but differ in how those atoms are connected. Condensed structural formulas make these connectivity differences visible through changes in atom order, grouping, or branch placement. Comparing formulas side by side can therefore show whether compounds share a composition while possessing different structures and potentially different chemical behavior.
The notation omits the separate drawing of every bond, so it provides less visual detail than a complete structural diagram. Its advantage is efficiency: atom sequence, repeated groups, and branches remain available for interpreting connectivity. For routine communication of many organic structures, this balance preserves useful structural information without requiring an elaborate drawing.
Begin by tracing the bonded atoms in sequence and recording their symbols in the same order. Combine repeated carbon and hydrogen arrangements into groups such as CH3 or CH2, and retain groups such as OH when they are structurally significant. If a group branches from the preceding atom or group, place it in parentheses at that position.
It is useful when chemists need to record or compare organic molecules efficiently, including simple alkanes and more complex molecules containing functional groups. The compact format supports communication of connectivity, comparison of alternative structures, and inspection of features that may affect chemical reactions. It is therefore practical for organizing structural information without drawing every individual bond.
Students can compare the order of atoms, repeated groups, functional group placement, and parenthetical branches across formulas. These features reveal whether structures have the same connectivity or differ in arrangement. Such comparisons help distinguish related compounds, recognize structural isomers, and connect changes in molecular structure with possible differences in chemical behavior.