2nd Edition

ISBN: 9780073511184

Author: Julia Burdge, Jason Overby Professor

Publisher: McGraw-Hill Education

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Electrolysis is defined as the process of breaking down ionic compounds into their constituent elements by passing a direct electric current through the compound in a fluid state. The cathode reduces cations, while the anode oxidizes anions. An electroly…

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Textbook Question

Chapter 18, Problem 18.83QP

An acidified solution was electrolyzed using copper electrodes. A constant current of 1.18 A caused the anode to lose 0.584 g after 1.52 × 10³ s. (a) What is the gas produced at the cathode, and what is its volume at STP? (b) Given that the charge of an electron is 1.6022 × 10⁻¹⁹ C, calculate Avogadro’s number. Assume that copper is oxidized to Cu²⁺ ions.

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Chapter 18, Problem 18.82QP

Chapter 18, Problem 18.84QP

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In the video, we looked at the absorbance of a certain substance and how it varies depending on what wavelength of light we are looking at. Below is a similar scan of a different substance. What color BEST describes how this substance will appear? Absorbance (AU) Violet Blue Green Orange 1.2 1.0- 0.8- 0.6- 0.4- 0.2 0.0 450 500 550 600 650 700 Wavelength (nm) violet indigo blue green yellow orange red Red O Cannot tell from this information In the above graph, what causes -450 nm wavelength of light to have a higher absorbance than light with a -550 nm wavelength? Check all that are true. The distance the light travels is different The different data points are for different substances The concentration is different at different times in the experiment Epsilon (molar absortivity) is different at different wavelengths

5. a. Data were collected for Trial 1 to determine the molar mass of a nonvolatile solid solute when dissolved in cyclo- hexane. Complete the table for the analysis (See Report Sheet). Record calculated values with the correct number of significant figures. B. Freezing Point of Cyclohexane plus Calculation Zone Unknown Solute 2. Mass of cyclohexane (g) 10.14 Part C.4 3. Mass of added solute (g) 0.255 C. Calculations 1. k; for cyclohexane (°C⚫ kg/mol) 20.0 2. Freezing point change, AT, (°C) 3.04 Part C.6 3. Mass of cyclohexane in solution (kg) 4. Moles of solute, total (mol) Show calculation. 5. Mass of solute in solution, total (g) 6. Molar mass of solute (g/mol) Show calculation.

Chapter 18 Solutions

Chemistry: Atoms First

Ch. 18.1 - Permanganate ion and iodide ion react in basic...Ch. 18.1 - Use the half-reaction method to balance the...Ch. 18.1 - Use the half-reaction method to balance the...Ch. 18.1 - Prob. 1PPC Ch. 18.1 - Prob. 18.1.1SR Ch. 18.1 - Prob. 18.1.2SR Ch. 18.3 - A galvanic cell consists of an Mg electrode in a...Ch. 18.3 - Determine the overall cell reaction and Ecell (at...Ch. 18.3 - A galvanic cell with Ecell = 0.30 V can be...Ch. 18.3 - Prob. 2PPC

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