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Organic Chemistry 1

Substitution reactions: SN1 vs SN2

2. SN2: one stepThe nucleophile attacks as the leaving group leaves, in one concerted step

3. SN2: what speeds it upSubstrate: methyl > primary > secondary; tertiary does not react by SN2

4. SN1: two stepsStep 1, the slow step: the leaving group leaves and a carbocation forms

5. SN1: what speeds it upCarbocation stability: tertiary > secondary, and primary almost never

Intro Psychology

2. The three-stage modelSensory memory holds input for under a second (iconic) to a few seconds (echoic)

3. Working memoryThe central executive directs attention

4. EncodingDeeper, meaningful processing leads to better recall (levels of processing)

5. Kinds of long-term memoryExplicit (declarative) memory: episodic (events) and semantic (facts)

Principles of Microeconomics

2. DefinitionPrice elasticity of demand = % change in quantity demanded / % change in price

3. Reading the numberElastic: greater than 1, quantity responds a lot

4. What makes demand elasticMany close substitutes

5. Elasticity and total revenueTotal revenue = price x quantity