What Drives Chemical Reactions D.2 Energy Cycles in Reactions (id: f8feb05f3)

本题目来源于试卷: What Drives Chemical Reactions D.2 Energy Cycles in Reactions，类别为 IB化学

[单选题]
The following diagram shows the enthalbrbka3 mi3/)rhf*;dxxr8 bl,6uh /sf(j r3ebpy of the reactantsd6xzan6djo17 diq 7q .(;npuk0i rns3 and products of a reaction involving gasir6nk q.qx360 1u 7ind jzdn (d;op7aseous covalent compounds. Which statement is correct?

A. The reactants have a higher total average bond enthalpy than the products
B. The products have a higher total average bond enthalpy than the reactants
C. The activation energy is the sum of the total bond enthalpies for the products and reactants
D. The activation energy is the difference between the total bond enthalpies for the products and reactants


参考答案:  B


本题详细解析:
The products are at a lower energy level than the reactants meaning that the total average bond enthalpy of formation of bonds in the products is greater than the total average bond enthalpy of breaking of bonds in the reactants.

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