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What can you conclude about these two reactions based on the chemical equations?

Reaction A: [tex]\( 6 CO_2(g) + 6 H_2O(\ell) + \text{sunlight} \rightarrow C_6H_{12}O_6(aq) + 6 O_2(g) \)[/tex]

Reaction B: [tex]\( 2 H_2(g) + O_2(g) \rightarrow 2 H_2O(g) + \text{energy} \)[/tex]

A. Reactions A and B are both exothermic.
B. Reaction A is endothermic, and reaction B is exothermic.
C. Reactions A and B are both endothermic.
D. Reaction A is exothermic, and reaction B is endothermic.

Sagot :

GinnyAnswer
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.
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