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level: End of chapter

Questions and Answers List

level questions: End of chapter

QuestionAnswer
Exothermic enthalpy changes, what valuesnegative △H values
Endothermic enthalpy changes have what valuesPositive △H values
Enthalpy changes can be calculated experimentally using the relationship. And how is this written for a mole of defined substance?Enthalpy change, q = mass of liquid x specific heat capacity x temperature change △H = -mc△T
What does the standard enthalpy change of formation relates?Relates to the enthalpy change when 1 mole of a compound is formed from its element under standard conditions
Hess's law can be used to calculate what?enthalpy changes for reactions that do not occur directly or cannot be found by experiment.
Is bond breaking ( endo/exo ) thermicendothermic
Is bond making (endo / exo) thermicexothermic
Average bond energies are often used because?strength of a bond between 2 particular types of atom is slightly different in different compounds