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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(l) + \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.



Answer :

GinnyAnswer
To determine the types of reactions (endothermic or exothermic) for Reaction A and Reaction B, let's analyze each one individually based on the given information.

### Reaction A:
[tex]\[ 6 \text{CO}_2(g) + 6 \text{H}_2\text{O}(l) + \text{sunlight} \rightarrow \text{C}_6\text{H}_{12}\text{O}_6(aq) + 6 \text{O}_2(g) \][/tex]

1. Observation: This reaction involves carbon dioxide and water combining to form glucose and oxygen, using sunlight as a reactant.
2. Energy Input: The inclusion of sunlight indicates that energy is required for this reaction to occur.
3. Conclusion: Since the reaction requires an input of energy (sunlight), it is consuming energy from the surroundings. This characteristic is indicative of an endothermic reaction.

### Reaction B:
[tex]\[ 2 \text{H}_2(g) + \text{O}_2(g) \rightarrow 2 \text{H}_2\text{O}(g) + \text{energy} \][/tex]

1. Observation: This reaction involves hydrogen and oxygen gases reacting to form water vapor, releasing energy in the process.
2. Energy Output: The production of energy (often seen as heat or light) indicates that the reaction releases energy to the surroundings.
3. Conclusion: Since the reaction releases energy, it is characteristic of an exothermic reaction.

### Summary of Reactions:
- Reaction A: Endothermic (energy is absorbed)
- Reaction B: Exothermic (energy is released)

Therefore, based on the analysis of these reactions, the correct conclusion is:

B. Reaction A is endothermic, and reaction B is exothermic.

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