O ii. and iv. Question 18 How does the internal energy of the universe change during an endothermic chemical reaction? The change in internal energy of the universe is less than zero. O The change in internal energy of the universe is greater than zero. O This cannot be determined without knowing how much work is done by the reaction system O The change in internal energy of the universe is equal to zero. MacBook Air

O ii. and iv. Question 18 How does the internal energy of the universe change during an endothermic chemical reaction? The change in internal energy of the universe is less than zero. O The change in internal energy of the universe is greater than zero. O This cannot be determined without knowing how much work is done by the reaction system O The change in internal energy of the universe is equal to zero. MacBook Air

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...

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Please explain! And what is the difference between answer B and C?
100 g of water at 86 °C is mixed with 200 g of water at 14 °C. What is the final temperature of the mixture? Assume that no heat is lost and that the specific heat capacity of water does not vary with temperature. A. 38 °C B. 44 °C C. 40 °C D. 46 °C E. 42 °C
Read the descriptions of physical or chemical changes in the table below. Then decide whether the change will be spontaneous, if you can. Change Is this change spontaneous? Yes. A solid substance dissolves in water, releasing heat as it does so. O No. Can't decide with information given. Yes. A solid precipitates from a solution, absorbing heat as it does so. O No. O Can't decide with information given. Yes. An endothermic chemical reaction between two liquids results in gaseous products. O No. O Can't decide with information given.
55.69 kJ of work are done by the system, which produces 80.17 kJ of heat. Determine the overall change in energy of the system in kilojoules.
Jugging every day is good for health. Assume that when you jog a work of 500 kJ is done and 230 kJ of heat is given off. What is the change in internal energy of your body? O a. 750 kJ O b. -750 kJ O c. 700 kJ O d. -730 kJ
A gas is cooled by removing 25 kJ of heat from the gas. As the volume decreases, the surroundings perform 3 kJ of work on the gas. What is the change in internal energy of the gas? a. 28 kJ b. 75 kJ c. –28 kJ d. 22 kJ e. –22 kJ
Exothermic Endothermic Heat Hotter than sUrOUndings Heat Heat /Cooler than surroundings Heat Heat Heat Which statement is correct? O When an exothermic process takes place in the system, the entropy of the surroundings does not change. O When an exothermic process takes place in the system, the entropy of the surroundings may increase or decrease. O When an exothermic process takes place in the system, the entropy of the surroundings decreases. O When an exothermic process takes place in the system, the entropy of the surroundings increases.
A change in a system occurs such that 13.6 J of heat flows in to the system and 13.4 J of work is done by the surroundings. What is the change in internal energy of the system? O a. 13.4 J O b. -27.0 J O c. 27.0 J O d. 0.2 J O e. 13.6 J
Consider an ideal gas enclosed in a 1.00 L container at an internal pressure of 14.0 atm. Calculate the work, ?, if the gas expands against a constant external pressure of 1.00 atm to a final volume of 14.0 L Now calculate the work done if this process is carried out in two steps. First, let the gas expand against a constant external pressure of 2.80 atm to a volume of 5.00 L. From the end point of step 1, let the gas expand to 14.0 L against a constant external pressure of 1.00 atm. ( PLZ DO BOTH PART , IF U PLAN TO DO ONLY ONE PART THEN SKIP DO BOTH PART PLZZ OR ELSE SKIP )DO COMPLETE SOLUTION
1.What happens to the heat capacity (CP) of a metal sample if its mass is doubled? Explain your answer[hint: examine the units and consider using the terms “intensive” or “extensive” in your answer]. 2.What happens to the specific heat (cs) of a metal sample if its mass is doubled? Explain your answer [hint:examine the units and consider using the terms “intensive” or “extensive” in your answer].
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20. In a chemical reaction, the amount of energy gained by the surroundings must equal the amount of energy released by the reaction(system). A. True B. False ount of heat needed to increase the temperature of one mole of a