Chemistry In Context
9th Edition
ISBN: 9781259638145
Author: Fahlman, Bradley D., Purvis-roberts, Kathleen, Kirk, John S., Bentley, Anne K., Daubenmire, Patrick L., ELLIS, Jamie P., Mury, Michael T., American Chemical Society
Publisher: Mcgraw-hill Education,
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Textbook Question
Chapter 7.5, Problem 7.7YT
Scientific Practices The Battery in Your Car
Let’s take a closer look at the lead–acid storage battery, the one found in most cars (Equation 7.11).
- a. Lead occurs in this equation as Pb, PbO2, and PbSO4, all solids. In which of these is lead in an ionic form? What are the charges (or oxidation states) of the ions? Which one of these symbols represents lead in its metallic form?
- b. When lead is converted from its metallic form to an ionic form, are electrons lost or gained? Is this oxidation or reduction?
- c. When the battery is discharging, is metallic lead oxidized or reduced?
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7. (a) Search the web for a value for the density of baby oil (if no T is given, it is assumed to be near room T):
Source company or site name where you got the value (don't list the full URL):
(b) Search the web (Google is best here) for the density of mineral oil from Sigma-Aldrich (a chemical company):
(c) As you learned during your prelab (hopefully!), baby oil and mineral oil are not pure substances. As such, their
composition (and thus density) can vary a bit, which would not be so for a pure substance (at a given T). That is why
you likely found varying values-or ranges of values-for baby…
Consider two identical metal spheres, A and B.
Sphere A carries a charge of – 48 µC and sphere B
carries a charge of - 64 µC. The two spheres are
touched together and then separated after they
acquire the same charge (after they reach
electrostatic equilibrium). How many electrons, n, are
transferred from sphere B to sphere A?
Equation:
Negative charge lost by sphere Bafter touching
n =
where e = -1.6 x 10-19 C.
Number of electrons transferred 1.0 x 104 electrons
Number of electrons transferred = 5.0 x 10 electrons
Number of electrons transferred = 2.0 x 1014 electrons
Number of electrons transferred = 1.5 x 1014 electrons
Number of electrons transferred = 3.2 x 105 electrons
7.A 4.035 gram sample of an organic compound containing only C, H, and O is analyzed by combustion analysis and 5.721 g CO2 and 3.514 g H2O are produced.In a separate experiment, the molar mass is found to be 62.07 g/mol. Determine the empirical formula and the molecular formula of the organic compound.Enter the elements in the order C, H, Oempirical formula = _______molecular formula =_______
Chapter 7 Solutions
Chemistry In Context
Ch. 7.1 - Prob. 7.2YTCh. 7.2 - Skill Building Coulombs The SI unit of electric...Ch. 7.2 - Prob. 7.4YTCh. 7.4 - Prob. 7.5YTCh. 7.4 - Scientific Practices The Shift from NiCd to NiMH...Ch. 7.5 - Scientific Practices The Battery in Your Car Lets...Ch. 7.7 - Prob. 7.9YTCh. 7.8 - Prob. 7.10YTCh. 7.9 - Prob. 7.11YTCh. 7.9 - Prob. 7.12YT
Ch. 7.10 - Prob. 7.13YTCh. 7.10 - Prob. 7.14YTCh. 7.11 - Skill Building Metal Refining (Smelting) The...Ch. 7.11 - You Decide Could Metals Become Extinct? In 2015,...Ch. 7.11 - Prob. 7.17YTCh. 7 - You Decide The Baghdad Battery Alessandro Volta is...Ch. 7 - Prob. 1QCh. 7 - Prob. 2QCh. 7 - Which chemical species gets oxidized and which...Ch. 7 - What is the difference between a galvanic cell and...Ch. 7 - Two common units associated with electricity are...Ch. 7 - Consider the galvanic cell pictured. A coating of...Ch. 7 - Prob. 7QCh. 7 - a. How does the voltage from a tiny AAA alkaline...Ch. 7 - Identify the type of galvanic cell commonly used...Ch. 7 - The mercury battery has been used extensively in...Ch. 7 - Prob. 12QCh. 7 - During the conversion of O2(g) to H2O(l) in a fuel...Ch. 7 - How does the reaction between hydrogen and oxygen...Ch. 7 - This diagram represents the hydrogen fuel cell...Ch. 7 - What is a PEM fuel cell? How does it differ from...Ch. 7 - How do PEM fuel cells allow H2 and O2 to combine...Ch. 7 - In addition to hydrogen, methane also has been...Ch. 7 - Prob. 19QCh. 7 - Potassium and lithium both are reactive Group 1...Ch. 7 - What challenges keep hydrogen fuel cells from...Ch. 7 - Explain the concept of energy density of a battery...Ch. 7 - Describe how a normal AA battery stores and...Ch. 7 - Prob. 24QCh. 7 - What is the difference between an electrolytic...Ch. 7 - Provide some differences between a leadacid...Ch. 7 - Describe the importance of a separator in primary...Ch. 7 - The company ZPower is promoting its silverzinc...Ch. 7 - Prob. 29QCh. 7 - Prob. 30QCh. 7 - Describe some advantages and disadvantages of...Ch. 7 - You never need to plug in Toyotas gasolinebattery...Ch. 7 - Prob. 33QCh. 7 - Hydrogen is considered an environmentally friendly...Ch. 7 - Fuel cells were invented in 1839 but never...Ch. 7 - Hydrogen and methane both can react with oxygen in...Ch. 7 - Engineers have developed a prototype fuel cell...Ch. 7 - Prob. 38QCh. 7 - Describe some similarities and differences between...Ch. 7 - Prob. 40QCh. 7 - Prob. 41QCh. 7 - Prob. 42QCh. 7 - Small quantities of hydrogen gas can be prepared...Ch. 7 - Prob. 44QCh. 7 - Although Alessandro Volta is credited with the...Ch. 7 - Prob. 46QCh. 7 - Prob. 47QCh. 7 - What is the tragedy of the commons? How does this...Ch. 7 - How can the principles of green chemistry be...Ch. 7 - If all of todays technology presently based on...Ch. 7 - Consider these three sources of light: a candle, a...Ch. 7 - Prob. 52Q
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