Question 30 – Heat energy changes in chemical reactions - Questions

The enthalpy diagram below represents the energy changes for the reaction between diatomic gases $X_2(g)$ and $Y_2(g)$ to form $2 X Y (g)$ via an intermediate state of isolated gaseous atoms.

Enthalpy Diagram

Which row in the table correctly identifies the thermodynamic energy changes and the molecular processes involved in Transition A and Transition B?

Transition A is exothermic ( $ΔH<0\Delta H < 0$ ) because bonds are broken; Transition B is endothermic ( $ΔH>0\Delta H > 0$ ) because bonds are formed.

Transition A is endothermic ( $ΔH>0\Delta H > 0$ ) because bonds are broken; Transition B is exothermic ( $ΔH<0\Delta H < 0$ ) because bonds are formed.

Transition A is endothermic ( $ΔH>0\Delta H > 0$ ) because bonds are formed; Transition B is exothermic ( $ΔH<0\Delta H < 0$ ) because bonds are broken.

Transition A is exothermic ( $ΔH<0\Delta H < 0$ ) because bonds are formed; Transition B is endothermic ( $ΔH>0\Delta H > 0$ ) because bonds are broken.

The enthalpy diagram below represents the energy changes for the reaction between diatomic gases $X_2(g)$ and $Y_2(g)$ to form $2 X Y (g)$ via an intermediate state of isolated gaseous atoms.

Enthalpy Diagram

Which row in the table correctly identifies the thermodynamic energy changes and the molecular processes involved in Transition A and Transition B?

Transition A is exothermic ( $ΔH<0\Delta H < 0$ ) because bonds are broken; Transition B is endothermic ( $ΔH>0\Delta H > 0$ ) because bonds are formed.

Transition A is endothermic ( $ΔH>0\Delta H > 0$ ) because bonds are broken; Transition B is exothermic ( $ΔH<0\Delta H < 0$ ) because bonds are formed.

Transition A is endothermic ( $ΔH>0\Delta H > 0$ ) because bonds are formed; Transition B is exothermic ( $ΔH<0\Delta H < 0$ ) because bonds are broken.

Transition A is exothermic ( $ΔH<0\Delta H < 0$ ) because bonds are formed; Transition B is endothermic ( $ΔH>0\Delta H > 0$ ) because bonds are broken.

Heat energy changes in chemical reactions

Question 24

Heat energy changes in chemical reactions

Question 24

Heat energy changes in chemical reactions

Question 24

Heat energy changes in chemical reactions Questions

Heat energy changes in chemical reactions

Question 24

Heat energy changes in chemical reactions Questions