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

-How will the percent yield of the reaction with table salt and AgNO₃ be affected if some of the solid precipitate is lost when it is filtered from the solution?

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

-How will the percent yield of the reaction with table salt and AgNO₃ be affected if some of the solid precipitate is lost when it is filtered from the solution?

Quizplus · Accepted Answer

11ecba2d_11fc_1354_a3bf_f75220040fd0_MD0008_00 The percent yield of a chemical reaction assesses the efficiency of a reaction and the laboratory procedure to isolate the product. Percent yield is the ratio of the amount of the product obtained (the actual yield) to the calculated theoretical yield. The theoretical yield of a chemical reaction is the maximum amount of product possible based on stoichiometric calculations. The theoretical yield is based on the number of moles of the limiting reactant and the stoichiometric ratios in the balanced chemical reaction. The actual yield obtained after conducting a reaction will be less than the theoretical yield when some of the product is lost in the process of conducting laboratory procedures such as filtering or transferring. The actual yield could appear to be greater than the theoretical yield when a product contains impurities or has not been completely dried before weighing. In the reaction between NaCl (table salt) and AgNO₃, solid AgCl is produced. If some of the solid AgCl is lost during filtration to isolate the product, the actual mass of the product obtained will be less than the calculated theoretical mass. According to the equation: 11ecba2d_11fc_1355_a3bf_4bcb7b7db5e5_MD0008_00 if the actual yield is less than the theoretical yield, then the percent yield will be less than 100%. (Choices A and B) Losing mass during filtration will cause the actual yield to be less than the theoretical yield. According to the equation for percent yield, this would cause the percent yield to be less than 100%, not greater. (Choice C) If the mass of the isolated product was apparently greater than the calculated mass because the isolated mass was insufficiently dried (had extra mass from water), it would mathematically give a percentage greater than (not less than) 100%. Educational objective: The percent yield is a description of the efficiency of a reaction. It is the ratio of the mass obtained from an experiment (the actual yield) to the calculated mass (theoretical yield) expressed as a percentage.

Passage Students Were Asked to Bring Items from Home to Serve