Question

What can you conclude about these two reactions based on the chemical equations? Reaction A: 6CO2(g) + 6H2O(l) + sunlight ? C6H12O6(aq) + 6O2(g) Reaction B: 2H2(g) + O2(g) ? 2H2O(g) + energy 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 1

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

Explanation: Got it right

6CO2+6H2O+ sunlight, so it absorbs thermal energy from the outside

2H2(g) + O2= 2H2O+ energy : it releases energy, so exothermic

Answer 2

Given reactions:

(A) 6CO2(g) + 6H2O(l) + sunlight → C6H12O6(aq) + 6O2(g)

(B) 2H2(g) + O2(g) → 2H2O(g) + energy

Exothermic reactions are those which proceed with the release of heat/energy. In contrast, endothermic reactions proceed with the absorption of energy in the form of heat or light.

Since reaction A required sunlight, it is endothermic. Reaction B releases energy, hence exothermic

Ans: (B)

A is endothermic

B is exothermic