Tutor profile: Sarah M.
Subject: Organic Chemistry
Describe the nuances of an SN2 reaction.
SN2 reactions are substitution, bimolecular, nucleophilic reactions. The substrate (alkyl halide) order of reactivity is methyl > primary > secondary >>>tertiary. Strong nucleophiles are required as is a polar, aprotic solvent which supports the reaction. This reaction is often called back side attack as the nucleophile attacks the carbon on the opposite side of the leaving group. Consequently, good leaving groups are required. Stereochemistry of the product is generally considered to be racemic.
How are ionic compounds containing transition metals named?
Proper nomenclature for compounds containing transition metals involves using "go to anions" to determine the charge for the transition metal. "Go to anions" are those in group 6A (16) and groups 7A (17) along with the assigned (and memorized) polyatomic ions to be used in the course. The nomenclature follows the rules of ionic compounds with the addition of a roman numeral depicting the charge on the metal ion. For example, FeCl3 is named Iron (III) chloride as chlorine (group 7A (17)) has a negative 1 charge leading to a total of 3 negative charges. Therefore, iron must be 3 positive charges to make a neutral compound.
Subject: Basic Chemistry
How are ionic compounds named?
Ionic compounds, composed of a metal and a nonmetal, are named by using the name of the metal followed by the name of the nonmetal with an "-ide" ending. Note polyatomic ions may be the nonmetal and have specific names. Your instructor will tell you which polyatomic ions to memorize for the course.
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