consider the decomposition of calcium carbonate shown below. which of the following statements correctly…

consider the decomposition of calcium carbonate shown below. which of the following statements correctly describes this reaction as it occurs in a test tube? caco3(s) + 42.5 kcal → cao(s) + co2(g) it is impossible to predict without actually performing the experiment. the test tube would feel warm, since the reaction would release heat to the surroundings. the test tube would feel cold, since the reaction would absorb heat from the surroundings. the test tube would feel warm, since the reaction would absorb heat from the surroundings. the test tube would feel cold, since the reaction would release heat to the surroundings.

consider the decomposition of calcium carbonate shown below. which of the following statements correctly describes this reaction as it occurs in a test tube? caco3(s) + 42.5 kcal → cao(s) + co2(g) it is impossible to predict without actually performing the experiment. the test tube would feel warm, since the reaction would release heat to the surroundings. the test tube would feel cold, since the reaction would absorb heat from the surroundings. the test tube would feel warm, since the reaction would absorb heat from the surroundings. the test tube would feel cold, since the reaction would release heat to the surroundings.

Answer

Brief Explanations:

The reaction $\mathrm{CaCO_3}(s)+42.5\ \text{kcal}\to\mathrm{CaO}(s)+\mathrm{CO_2}(g)$ has heat on the reactant - side, indicating it is an endothermic reaction. Endothermic reactions absorb heat from the surroundings. So the test - tube would feel cold as heat is being absorbed from it.

Answer:

The test tube would feel cold, since the reaction would absorb heat from the surroundings.