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)
Question
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)
Solution
The decomposition of calcium carbonate (CaCO3) into calcium oxide (CaO) and carbon dioxide (CO2) is an endothermic reaction. This is indicated by the "+ 42.5 kcal" in the reaction, which means that this amount of heat energy is absorbed from the surroundings for the reaction to occur.
In a test tube, you would observe the solid calcium carbonate breaking down into a solid (calcium oxide) and a gas (carbon dioxide). The test tube would likely feel cold to the touch, as heat is being absorbed from the surroundings.
So, the correct statement describing this reaction as it occurs in a test tube would be: "The decomposition of calcium carbonate in a test tube absorbs heat from the surroundings, producing calcium oxide and carbon dioxide."
Similar Questions
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.
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