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Chapter 6 
Chemical Reactivity and Mechanisms 
 
 
Review of Concepts 
Fill in the blanks below. To verify that your answers are correct, look in your textbook at the end of 
Chapter 6. Each of the sentences below appears verbatim in the section entitled Review of Concepts and 
Vocabulary. 
 
 ________________ reactions involve a transfer of energy from the system to the surroundings, 
while ______________ reactions involve a transfer of energy from the surroundings to the system. 
 Each type of bond has a unique ________________________ energy, which is the amount of 
energy necessary to accomplish homolytic bond cleavage. 
 Entropy is loosely defined as the ___________ of a system. 
 In order for a process to be spontaneous, the change in ____________________ must be negative. 
 The study of relative energy levels and equilibrium concentrations is called 
___________________. 
 The study of reaction rates is called ______________. 
 _____________ speed up the rate of a reaction by providing an alternate pathway with a lower 
energy of activation. 
 On an energy diagram, each peak represents a ___________________, while each valley 
represents ________________________. 
 A _________________ has an electron-rich atom that is capable of donating a pair of electrons. 
 An __________________ has an electron-deficient atom that is capable of accepting a pair of 
electrons. 
 For ionic reactions, there are four characteristic arrow-pushing patterns: 1) 
___________________, 2) ___________________, 3) ___________________, and 4) 
___________________. 
 As a result of hyperconjugation, ___________ carbocations are more stable than secondary 
carbocations, which are more stable than ___________ carbocations. 
 
 
 
 
Review of Skills 
Fill in the empty boxes below. To verify that your answers are correct, look in your textbook at the end of 
Chapter 6. The answers appear in the section entitled SkillBuilder Review. 
 
 
SkillBuilder 6.1 Predicting ΔHº of a Reaction 
 
 
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