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Part A Assuming constant pressure, rank these reactions from most energy released by the system to most energy absorbed by the system, based on the following descriptions: A. Surroundings get colder and the system decreases in volume. B. Surroundings get hotter and the system expands in volume. C. Surroundings get hotter and the system decreases in volume. D. Surroundings get hotter and the system does not change in volume. Also assume that the magnitude of the volume and temperature changes are similar among the reactions. Rank from most energy released to most energy absorbed. To rank items as equivalent, overlap them.

Part A Assuming constant pressure, rank these reactions from most energy released by the system to most energy absorbed by the system, based on the following descriptions: A. Surroundings get colder and the system decreases in volume. B. Surroundings get hotter and the system expands in volume. C. Surroundings get hotter and the system decreases in volume. D. Surroundings get hotter and the system does not change in volume. Also assume that the magnitude of the volume and temperature changes are similar among the reactions. Rank from most energy released to most energy absorbed. To rank items as equivalent, overlap them.

Chemistry: The Molecular Science
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter4: Energy And Chemical Reactions
Section: Chapter Questions
Problem 89QRT
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Energy cannot be created nor destroyed, but it can be transferred between a reaction and its surroundings. The change in energy, AE, is positive if the reaction absorbs energy, and it is negative if the reaction releases energy. You may also see this expressed in terms of change in internal energy, AU. For the purposes of this question, AU and AE are equal. One way a reaction can transfer energy to or from the surroundings is by releasing or absorbing heat. A reaction can also transfer energy, in the form of work, through a change in volume. The total change in energy is the sum of the heat and work: AE=q+w At constant pressure, q = and so AH and w=-. - PAV AE=AH - PAV Part A Assuming constant pressure, rank these reactions from most energy released by the system to most energy absorbed by the system, based on the following descriptions: A. Surroundings get colder and the system decreases in volume. B. Surroundings get hotter and the system expands in volume. C. Surroundings get hotter and the system decreases in volume. D. Surroundings get hotter and the system does not change in volume. Also assume that the magnitude of the volume and temperature changes are similar among the reactions. Rank from most energy released to most energy absorbed. To rank items as equivalent, overlap them. ► View Available Hint(s) Reaction A Most energy released Reaction B Reaction C Reaction D Reset Help Most energy absorbed
Transcribed Image Text:Energy cannot be created nor destroyed, but it can be transferred between a reaction and its surroundings. The change in energy, AE, is positive if the reaction absorbs energy, and it is negative if the reaction releases energy. You may also see this expressed in terms of change in internal energy, AU. For the purposes of this question, AU and AE are equal. One way a reaction can transfer energy to or from the surroundings is by releasing or absorbing heat. A reaction can also transfer energy, in the form of work, through a change in volume. The total change in energy is the sum of the heat and work: AE=q+w At constant pressure, q = and so AH and w=-. - PAV AE=AH - PAV Part A Assuming constant pressure, rank these reactions from most energy released by the system to most energy absorbed by the system, based on the following descriptions: A. Surroundings get colder and the system decreases in volume. B. Surroundings get hotter and the system expands in volume. C. Surroundings get hotter and the system decreases in volume. D. Surroundings get hotter and the system does not change in volume. Also assume that the magnitude of the volume and temperature changes are similar among the reactions. Rank from most energy released to most energy absorbed. To rank items as equivalent, overlap them. ► View Available Hint(s) Reaction A Most energy released Reaction B Reaction C Reaction D Reset Help Most energy absorbed
Part B A mole of X reacts at a constant pressure of 43.0 atm via the reaction X(g) +4Y(g)→2Z(g), AH° = -75.0 kJ Before the reaction, the volume of the gaseous mixture was 5.00 L. After the reaction, the volume was 2.00 L. Calculate the value of the total energy change, AE, in kilojoules. Express your answer with the appropriate units. ► View Available Hint(s) μA ΔΕ = Value Submit Units = ?
Transcribed Image Text:Part B A mole of X reacts at a constant pressure of 43.0 atm via the reaction X(g) +4Y(g)→2Z(g), AH° = -75.0 kJ Before the reaction, the volume of the gaseous mixture was 5.00 L. After the reaction, the volume was 2.00 L. Calculate the value of the total energy change, AE, in kilojoules. Express your answer with the appropriate units. ► View Available Hint(s) μA ΔΕ = Value Submit Units = ?
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