This question is about endothermic and exothermic reactions.

a. Explain the meaning of the terms endothermic and exothermic.

b. (i) Draw an energy level diagram for the reaction:

(ii) Is this reaction endothermic or exothermic?

(iii) Calculate the energy change associated with this reaction if 2 moles of sodium hydroxide were neutralised by excess hydrochloric acid.

c. (i) Draw an energy level diagram for the reaction:

(ii) Is this reaction endothermic or exothermic?

(iii) Calculate the energy change for this reaction if only 9 g of water were converted into hydrogen and oxygen.

Transcribed Image Text:

NaOH(aq) + HCI(aq) → NaCl(aq) + H,O(1) AH= -57 kJ mol-1