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

-Based on the information in the passage, what is the identity of the gas formed from the decomposition of H₂O₂?

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

-Based on the information in the passage, what is the identity of the gas formed from the decomposition of H₂O₂?

Quizplus · Accepted Answer

11ecba2d_11fb_01e0_a3bf_bf605416788e_MD0008_00 Chemical reactions are classified into types based on general patterns. This assists in the prediction of the products of a reaction that can then be verified with the correct tests in the laboratory. A decomposition reaction follows the general pattern of one reactant breaking down into two or more products made from the elements of the original compound: 11ecba2d_11fb_01e1_a3bf_f5b1f5398698_MD0008_00 Decomposition reactions often require an energy source to break the bonds in the reactant. However, for the decomposition of H₂O₂, MnO₂ catalyzes the breaking of the hydrogen and oxygen bonds in peroxide by forming a reactive intermediate. Because the glowing splint burned more brightly in the gas that was produced when the MnO₂ was added, one of the products of the decomposition of H₂O₂ is O₂. From this, it can be inferred that the other product is H₂O. Accordingly, the net reaction for the decomposition of H₂O₂ is: 11ecba2d_11fb_01e2_a3bf_2972550f296a_MD0008_00 (Choice A) Because the burning splint test did not make the sound of a "pop" (indicating the ignition of hydrogen gas), the evidence does not support that H₂ was present in the reaction flask. (Choices B and C) Because there are no carbon or nitrogen atoms in H₂O₂, neither carbon dioxide (CO₂) nor nitrogen gas (N₂) can be products of the reaction. In addition, if CO₂ were present, the glowing splint test would have extinguished the embers. Educational objective: Reaction types follow a general pattern and allow for the prediction of the products of a reaction that can then be verified in the laboratory.

Passage Students Were Asked to Bring Items from Home to Serve