Study questions -chapt 181. Which of the following changes lead to a decrease in entropy?a. sugar dissolving in coffeeb. mixing of pure gasesc. the sublimation (vaporization) of dry ice (solid carbon dioxide)d. melting snowe. halving the volume of a gas2 At what temperatures will a reaction be spontaneous if A,H° = +117 kJ and A,S° =-35 J/K?3. Calculate A,G° for the following reaction at 425 °C,(8)I + (3)*H_, (3)IHgiven K= 0.018. (R=8.314 J/K-mol)%3D4. For a reaction, A,H° = -208.8 kJ and A,S° =-308.2 J/K. At what temperature will A,G° = 0.00 kJ?%3D%3D5. What is the sign of AH(system) and AS(system) if a chemical reaction is spontaneous at all temperatures under standard conditions?HV ε(system) is negative, and AS(system) is positive.HV °q(system) is negative, and AS(system) is negative.HV(system) is positive, and AS(system) is positive.HV P(system) is positive, and AS(system) is negative.e. none of these6. For which of the following reactions will the entropy of the system decrease?a. 2 NH3(g) → N2(g) + 3 H2(g)b. 2 C(s) + O2(g) → 2 CO(g)C. CACO3(s) → CaO(s) + CO2(g)d. 2 NO2(g) → N20:(g)e. NaOH(s) → Na (aq) + OH (aq)7. Which of the following linear chain alcohols is likely to have the highest standard entropy in the liquid state?a. CH;OH1. 2.Chapt 18b. CH;CH2OHс. CH-CH.CH-OНd. CH;CH2CH2CH2OHe. CH3CH2CH2CH2CH2OH8. The following processes occur spontaneously at 25 °C. Which of these processes is/are endothermic?NH,NO3 dissolving in water (which is accompanied by a cooling of the water).the expansion of a real gas into a vacuum (which is accompanied by a cooling of the1.2.gas).3. liquid water in an ice cube tray freezing into ice after being placed in a freezer.a. 1 onlyb. 2 onlyc. 3 onlyd. 1 and 2e. 1, 2, and 39. For the combustion of acetylene at 298.15 K,2 C¿H2(g) + 5 O2(g) → 4 CO2(g) + 2 H2O(g)calculate AS (universe) given AS (system) = -194.6 J/K and AH°(system) = -2511.2 kJ.10. If a chemical reaction occurs in a direction that has a positive change in entropy thena. the change in enthalpy must be negative.b. the reaction must be spontaneous.c. heat goes from the system into the surroundings.d. the reaction must be exothermic.e. the disorder of the system increases.

Entropy is the measure of randomness or disorder in a system. As entropy refers to the degree of disorderness of a system, the greater the volume of a gas, the greater its entropy. The entropy of a system is directly proportional to its volume. Hence a decrease in the volume of a gas leads to a decrease in its entropy. Ultimately, if the volume of a given mass of gas is halved, its entropy decreases according. Therefore the answer is => e. Halving the volume of a gas.

Science

Chemistry

1. Which of the following changes lead to a decrease in entropy? a. sugar dissolving in coffee b. mixing of pure gases c. the sublimation (vaporization) of dry ice (solid carbon dioxide) d. melting snow e. halving the volume of a gas

1. Which of the following changes lead to a decrease in entropy? a. sugar dissolving in coffee b. mixing of pure gases c. the sublimation (vaporization) of dry ice (solid carbon dioxide) d. melting snow e. halving the volume of a gas

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

8 As you dissolve salt in water, what change would you expect to occur? A B C D The entropy of the system will increase. The kinetic energy of the water molecules decreases. The salt consumes energy as it transfers entropy The water molecules become more closely packed as the temperature increases
Which process results in the increase in entropy of the universe?
Compare what will happen to the entropy of the whole system in the following two scenarios: A) if the oil molecules are all clumped together and the clump is surrounded by water and B) if the oil molecules are spread out evenly throughout the water, each individual oil molecule surrounded by water?
13please answer and refer to the periodic table
According to the third law of thermodynamics, at what temperature will entropy become zero? A. 0° B. 25°C C. 0K D. 273 K
In which of the following processes would the entropy of the system increase? A liquid forming from a gas. A solid forming from a gas. The number of gas molecules increasing during a chemical reaction. A solid precipitating from a solution.
In biology the equilibrium equations that keep living organisms alive are called homeostasis. How does thermodynamics and entropy in particular effect this process and life in general?
5. Which of the following has a negative DS? A. Dissolve salt in water B. Heating chlorine vapors C. Heating a pure liquid D. Deposition of a gas to a solid 6. Which of the following has a negative DS? A. Melting ice B. Freezing liquid bromine C. Subliming a solid to a gas D. Evaporating water 7. What is defined as the phenomenon where the entropy of the universe increases in a spontaneous process and is constant in an equilibrium process? A. The law of spontaneity B. The 1st law of thermodynamics C. The 2nd law of thermodynamics D. The 3rd law of thermodynamics.