1) Which statement correctly describes Hess's Law? a) The enthalpy of all reactants in teir standard states is defined as zero. b) Enthalpy changes may only be calculated if one or more of the reactants is an element. c) The enthalpy change of a reaction is independant of the route taken. 2) Which statement best describes the enthalpy of formation of any element? a) The enthalpy value depends on temperature. b) The enthalpy value is zero but only for elements in the soild state. c) The enthalpy for is always zeero for any element in its standard state. 3) What is the average bond enthalpy? a) The energy needed to break one mole of bonds in the gas phase averaged over many compounds. b) The energy needed to allow a reaction to happen. 4) The following picture is called... a) ...Nigel b) ... A Maxwell-Bolztmann distribution 5) The area under the pink line on the diagram shows the effect of... a) Adding a catalyst b) Increasing the temperature c) Decreasing the temperature 6) In this enthalpy diagram, the short arrow pointing up represents the ... a) Enthalpy change b) Activation Energy 7) This diagram represents what kind of reaction...? a) Endothermic b) Exothermic c) Homogenous

Simple energetics quiz

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