Passage
Students were asked to bring items from home to serve as examples for different types of reactions. The instructor provided additional reactants, solvents, heat, or a catalyst to demonstrate reactions with the household items.The students brought aluminum foil, table salt, sugar, baking soda, vinegar, toilet bowl cleaner, hydrogen peroxide, and antacid tablets.Experiment 1Reactions were performed using the household items. The reaction conditions and student observations are recorded in Table 1.Table 1 Reaction Conditions and Visual Observations
Experiment 2The reactions that were observed to produce gas bubbles in Experiment 1 were repeated, and samples of the gases produced were collected. Each gas sample was tested by holding a burning (glowing) wooden splint within the reaction vessel to determine if the reaction evolved O₂, H₂, or CO₂. A glowing splint placed in O₂ will burn more brightly, one placed in H₂ will ignite the gas, and one placed in CO₂ will be extinguished. The results of the gas tests are recorded in Table 2.Table 2 Glowing Splint Gas Test Observations

-Which of the following is the reaction for the decomposition of calcium carbonate based on the information in Tables 1 and 2?

Question

Passage
Students were asked to bring items from home to serve as examples for different types of reactions. The instructor provided additional reactants, solvents, heat, or a catalyst to demonstrate reactions with the household items.The students brought aluminum foil, table salt, sugar, baking soda, vinegar, toilet bowl cleaner, hydrogen peroxide, and antacid tablets.Experiment 1Reactions were performed using the household items. The reaction conditions and student observations are recorded in Table 1.Table 1 Reaction Conditions and Visual Observations

Experiment 2The reactions that were observed to produce gas bubbles in Experiment 1 were repeated, and samples of the gases produced were collected. Each gas sample was tested by holding a burning (glowing) wooden splint within the reaction vessel to determine if the reaction evolved O₂, H₂, or CO₂. A glowing splint placed in O₂ will burn more brightly, one placed in H₂ will ignite the gas, and one placed in CO₂ will be extinguished. The results of the gas tests are recorded in Table 2.Table 2 Glowing Splint Gas Test Observations

-Which of the following is the reaction for the decomposition of calcium carbonate based on the information in Tables 1 and 2?

Quizplus · Accepted Answer

11ecba2d_11f9_f06a_a3bf_43d7a9d480e3_MD0008_00 An important reaction type is the decomposition reaction, which involves the breaking down of a compound into its elemental constituents or into simpler, stable compounds. This type of reaction usually requires the addition of energy (such as heat) to break the bonds of the original compound. In this question, calcium carbonate is isolated from the inactive ingredients in an antacid tablet and then placed over a flame. The gas produced is CO₂, based on the results from the glowing splint test. This means that the white solid that remains is a new compound that does not have carbon in it. Calcium preferentially forms a metal oxide in the presence of oxygen, so the other product must be CaO. (Choice A) According to the passage, HCl was not added to perform this reaction. Also, this is not a decomposition reaction because there are two reactants, CaCO₃ and HCl. Reactions with acids or bases are often double replacement reactions in which water is produced. (Choices B and D) The question asks for the decomposition of calcium carbonate, which means CaCO₃ must be the only reactant (on the left side) of the chemical equation. Educational objective: A decomposition reaction is a type of reaction in which energy is added to break down a compound into either its elemental constituents or into simpler, stable compounds.

Passage Students Were Asked to Bring Items from Home to Serve