08:40Exothermic Energy Diagram: Activation Energy, Transition States and Enthalpy Change - TUTOR HOTLINEMelissa Maribel403views1rank
04:17What Are Endothermic & Exothermic Reactions | Chemistry | FuseSchoolFuseSchool - Global Education669views
Multiple ChoiceWhich of the following exchanges of energy has a positive sign for heat (relative to the system)?245views
Multiple ChoiceIf 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?432views
Multiple ChoiceA 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?465views
Open QuestionThe enthalpy of formation of water is -285.8 kJ/mol. What can be inferred from this statement?285views
Open QuestionWhat would likely happen if you were to touch the flask in which an endothermic reaction?184views
Open QuestionIdentify which of the following is true for the reaction N2(g) + 3 H2(g) → 2 NH3(g)172views
Open QuestionWhich has greater energy in an exothermic reaction, the reactants or the products?173views
Open QuestionWhat type of process occurs when solidified wax is converted to liquid wax on heating?132views
Open QuestionAn (a) __________ reaction liberates heat and the temperature of the reaction mixture increases.139views
Open QuestionConsider the reaction pictured below in which a molecule of X2 reacts with a molecule of Y2 to form two molecules of XY. The reaction is exothermic. Which of the following statements involving the bond enthalpies of X2, Y2, and XY is or are true?i. 𝐷(X—X),𝐷(Y—Y), and 𝐷(𝑋—𝑌) all have positive values.ii. 2𝐷(X—Y)<𝐷(X—X)+𝐷(Y—Y).iii. Δ𝐻=𝐷(X—X)+𝐷(Y—Y)−2𝐷(X—Y).
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