5.26 For the following processes, calculate the change in internal energy of the system and determine whether the process is endothermic or exothermic: (a) A balloon is cooled by re- moving 0.655 kJ of heat. It shrinks on cooling, and the atmo- sphere does 382 J of work on the balloon. (b) A 100.0-g bar of gold is heated from 25 °C to 50 °C during which it absorbs 322 J of heat. Assume the volume of the gold bar remains surroundings while the system. constant. 5.27 A gas is confined to a cylinder fitted with a piston and an electrical heater, as shown here: 016360 A 81.2 Suppose that current is supplied to the heater so that 100 J of is added. Consider two different situations. In case (1) energy the piston is allowed to move as the energy is added. In case

5.26 For the following processes, calculate the change in internal energy of the system and determine whether the process is endothermic or exothermic: (a) A balloon is cooled by re- moving 0.655 kJ of heat. It shrinks on cooling, and the atmo- sphere does 382 J of work on the balloon. (b) A 100.0-g bar of gold is heated from 25 °C to 50 °C during which it absorbs 322 J of heat. Assume the volume of the gold bar remains surroundings while the system. constant. 5.27 A gas is confined to a cylinder fitted with a piston and an electrical heater, as shown here: 016360 A 81.2 Suppose that current is supplied to the heater so that 100 J of is added. Consider two different situations. In case (1) energy the piston is allowed to move as the energy is added. In case

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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PLESE ANSWER QUESIN NUM 33
2. Arrange Pb, Mg, and Zn in order their activities, listing the most active first. 1. 2. 3. Arrange Cu, Ag, and Zn in order their activities, listing the most active first. 1. 2. 3. 4. Arrange Mg, H, and Ag in order of their activities, listing the most active first. 1. 2. 3. 5. Arrange all five of the metals (excluding hydrogen) in in an activity series, listing the most active first. 1. 2. 3. 4. 5. 3.
part 2
2. (5) 8 Question b6 of / Complete and balance the following half-reaction in acidic solution MnO,(aq) → Mno,(s) -> 3. 02+03+ 4- 4+ 3 4 7 9. 0. 1 03 4 6. (s) (1) (g) (aq) e H* OH H. Mn H,O* H.O Reset • x H,O Delete
5. 1.26A passed through electrolytic cell containing a dilute sulfuric acid solution for 7.44h. write half-cell reactions and calculate the volume of gases generated ( in latm and 0°c)
Give only typing answer with explanation and conclusion Which of the following statements is/are incorrect? (6,25 p) I- In order for an organic compound to be a dyestuff, it must be chromor and auxochrochrome. II- Hydroxyl or amino groups can be given as examples of chromophore groups III- Decrease of chromophore groups in a molecule causes color deepening. A. b) II, III B. a) I only C. d) II only D. c) III only
(6) - Examine the following REDOX reaction: SH₂C₂O(g) + 2KMnO4(1) + 6HCl(aq) 2MnCl2(g) + 2KCl(aq) +10CO₂(g) +8H₂O 0.395 g of KMnO4 were reacted with 50.0 mL of 0.075 M H₂C₂O4 and 25.00 ml of 0.25 M HCI. The final solution was diluted to 125 mL. What is the resulting concentration of Mn²* ions in the final solution? (note: this is a limiting reagent problem!)
5 (18) A galvanic cell needs to be set up in which the reduction of Cr³+ to Cr (s) takes place at the cathode. Which of the following redox pairs must be placed at the anode? (A) Fe²+/Fe (s) (B) Sn²+/Sn (s) (C) Zn²+/Zn(s) (D) Fe³+/Fe (s) (E) Pb²+/Pb (s) horas!
2.4 The mercury in 0.1042 g sample was precipitated with excess of paraperiodic acid, H5lO6: 5Hg²+ + 2H51O6 Hg5(106)2 + 10H+, The precipitate was filtered, washed free of precipitating agent, dried and weighed and 0.5212 g was recovered. Calculate the percentage of mercury chloride in the sample.
Give the oxidation number of phosphorous in the following: (a) H₂P₂0,²- (select) (b) PCL5 (select) (c) PH4+ (select)
In each redox reaction indicated in equations 1-6, indicate which species is oxidized and which species is reduced.