8. Thermochemistry

Endothermic & Exothermic Reactions

Open Question
What would likely happen if you were to touch the flask in which an endothermic reaction?
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Multiple Choice
Which of the following exchanges of energy has a positive sign for heat (relative to the system)?
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Multiple Choice
If a cylinder equipped with a piston expands against an external pressure of 1.25 atm, increasing the volume of a cylinder by 0.500 L and releasing 25.0 J of heat, what is ΔE for the process?
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Multiple Choice
A 0.1250-g sample of octane (C₈H₁₈) is burned in a bomb calorimeter with a heat capacity of 5.1 × 10² J/℃. The temperature inside the calorimeter increases by 11.8℃. What is the ΔE (in kJ/mol octane) for the combustion of octane?
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Multiple Choice
Which of the following is the result of an exothermic process?
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Open Question
The following reaction A --> B + C + heat is a(n) _____ reaction.
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Open Question
The enthalpy of formation of water is -285.8 kJ/mol. What can be inferred from this statement?
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Open Question
Which of the following processes is endothermic?
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Open Question
Which one of the following is an endothermic process?
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Open Question
Which of the reactions are exothermic?
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Open Question
In which one of the following processes is the system endothermic?
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Open Question
Which statement is true if the ΔH_rxn of a reaction is positive?
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Open Question
2 Mg(s) + O₂(g) → 2 MgO(s) ΔH = −1204 kJ
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Open Question
Identify which of the following is true for the reaction N₂(g) + 3 H₂(g) → 2 NH₃(g)
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Open Question
Which has greater energy in an exothermic reaction, the reactants or the products?
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