To determine whether the reactions are endothermic or exothermic, we need to consider whether energy is absorbed or released during each reaction.
### Reaction A: [tex]\(6 \text{CO}_2 (g) + 6 \text{H}_2 \text{O} (\ell) + \text{sunlight} \rightarrow \text{C}_6 \text{H}_{12} \text{O}_6 (aq) + 6 \text{O}_2 (g)\)[/tex]
- In Reaction A, carbon dioxide and water combine using sunlight to form glucose and oxygen.
- The term "sunlight" indicates that light energy is being absorbed to drive the reaction.
- Because energy is required (absorbed) for the reaction to occur, we can conclude that Reaction A is endothermic.
### Reaction B: [tex]\(2 \text{H}_2 (g) + \text{O}_2 (g) \rightarrow 2 \text{H}_2 \text{O} (g) + \text{energy}\)[/tex]
- In Reaction B, hydrogen gas reacts with oxygen gas to produce water and energy.
- The term "energy" after the reaction implies that energy is released during the reaction.
- Because energy is released, we can conclude that Reaction B is exothermic.
Thus, based on our analysis, the correct conclusion is:
B. Reaction A is endothermic, and reaction B is exothermic.
