Question

use the energy diagram below to fill in the blanks: the energy of the reactants is and the energy of the products is we know that the reaction represented by this energy diagram is because the energy of the is greater than the energy of the reactants. this makes the heat of reaction have a sign with a numerical value of kj. the energy of the transition state/activated complex in kj is making the activation energy of the reaction in kj. possible points: 8 pe (kj) 50 40 30 20 10 a + b c + d progress of the reaction positive 10 20 40 50 exothermic endothermic products

Explanation:

Step1: Identify reactant energy

From the diagram, the energy of reactants $A + B$ is at the starting - point on the y - axis of potential energy (PE). So the energy of the reactants is $10$ kJ.

Step2: Identify product energy

The energy of products $C + D$ is at the end - point on the y - axis of PE. So the energy of the products is $20$ kJ.

Step3: Determine reaction type

Since the energy of the products ($20$ kJ) is greater than the energy of the reactants ($10$ kJ), the reaction is endothermic as it absorbs energy.

Step4: Calculate heat of reaction

The heat of reaction ($\Delta H$) is calculated as $\Delta H=H_{products}-H_{reactants}$. So $\Delta H = 20 - 10=10$ kJ, and it has a positive sign.

Step5: Identify transition - state energy

The energy of the transition state/activated complex is the peak of the energy curve, which is $40$ kJ.

Step6: Calculate activation energy

The activation energy ($E_a$) is the difference between the energy of the transition state and the energy of the reactants. So $E_a=40 - 10 = 30$ kJ.

Answer:

The energy of the reactants is $10$ kJ and the energy of the products is $20$ kJ. We know that the reaction represented by this energy diagram is endothermic because the energy of the products is greater than the energy of the reactants. This makes the heat of reaction have a positive sign with a numerical value of $10$ kJ. The energy of the transition state/activated complex in kJ is $40$, making the activation energy of the reaction $30$ kJ.