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Notes
Notes

...  Definition/Functional group: contain at least one benzene ring, often with other groups added (“substituted” for hydrogen). Benzene exists as a resonance structure. It is also a carcinogen.  Prefix: Benz Examples  Benzene Benzaldehyde ...
CHEMISTRY The Central Science 9th Edition
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... destroyed in a chemical reaction that support Law of conservation of mass Dalton’s atomic theory States that the relative number and kinds of atoms are constant in a given compound that support the law of constant proportions. (b) According to Law of conservation of mass The mass of ammonia formed = ...
Chapter 2 - Foothill College
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Cumulative Review, entire quarter
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Learning Outcomes for CHEM1001 in 2015

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Study Guide for Test 2: Chapters 3 & 4... This is NOT a complete list of what will be... Revised March 4, 2014

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... This family which consists of all the elements in the second column on the Periodic Table are known as the Alkaline Earth Metals. Each of these elements has two electrons in its outer shell. Therefore, they readily give up these electrons to become more stable and are somewhat reactive. The B Elemen ...
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Students will review concepts from their quiz and then correct it at

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chemical bonds - geraldinescience
chemical bonds - geraldinescience

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... 1. Classify the following groups into +I and –I groups: i) CH3 ii) NH2 iii) NO2 iv) Cl 2. Give the differences between mesomeric effect and inductive effect. 3. Define torsional strain and torsional energy. 4. Give the eclipsed and staggered conformations of n-butane. 5. Give the IUPAC names and the ...
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Essential Standard: 8.P.1 Understand the properties of matter and
Essential Standard: 8.P.1 Understand the properties of matter and

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... • A valence electron is an electron that is associated with an atom, and that can participate in the formation of a chemical bond • This ability makes large, complex molecules possible • In molecules with multiple carbons, each carbon bonded to four other atoms has a tetrahedral shape • However, whe ...
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Organic_2_7ed_07th_module_carboxylic_acids 370KB May 03

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Unit 2 Biochemistry Chp 4 Organic Chemistry Notes

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Homoaromaticity



Homoaromaticity in organic chemistry refers to a special case of aromaticity in which conjugation is interrupted by a single sp3 hybridized carbon atom. Although this sp3 center disrupts the continuous overlap of p-orbitals, traditionally thought to be a requirement for aromaticity, considerable thermodynamic stability and many of the spectroscopic, magnetic, and chemical properties associated with aromatic compounds are still observed for such compounds. This formal discontinuity is apparently bridged by p-orbital overlap, maintaining a contiguous cycle of π electrons that is responsible for this preserved chemical stability.The concept of homoaromaticity was pioneered by Saul Winstein in 1959, prompted by his studies of the “tris-homocyclopropenyl” cation. Since the publication of Winstein's paper, much research has been devoted to understanding and classifying these molecules, which represent an additional “class” of aromatic molecules included under the continuously broadening definition of aromaticity. To date, homoaromatic compounds are known to exist as cationic and anionic species, and some studies support the existence of neutral homoaromatic molecules, though these are less common. The 'homotropylium' cation (C8H9+) is perhaps the best studied example of a homoaromatic compound.
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