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 enthalpy of the react ww ;g vaz0wdjmp 1dac(.2;c 0rants and p ve.p09qgi j.mlyt5i 2i-qz- kroducts of a reacti iiq9g.5qe p.z2-ij t0k ymv-lon involving gaseous 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.
| 
