Chemistry: The Central Science (14th Edition)

14th Edition

ISBN: 9780134414232

Author: Theodore E. Brown, H. Eugene LeMay, Bruce E. Bursten, Catherine Murphy, Patrick Woodward, Matthew E. Stoltzfus

Publisher: PEARSON

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Textbook Question

Chapter 3, Problem 91AE

Very small semiconductor crystals, composed of approximately 1000 to 10,000 atoms, are palled quantum dots. Quantum dots made of the semiconductor CdSe are now being used in electronic reader and tablet displays because they emit light efficiently and in multiple colors, depending on dot size. The density of CdSe is 5.82 g/cm³

a. What is the mass of one 2.5-nm CdSe quantum dot?

b. CdSe quantum dots that are 2.5 nm in diameter emit blue light upon stimulation. Assuming
that the dot is a perfect sphere and that the empty space in the dot can be neglected,
calculate how many Cd atoms are in one quantum dot of this size.

c. What is the mass of one 6.5-nm CdSe quantum dot?

d. CdSe quantum dots that are 6.5 nm in diameter emit red light upon stimulation. Assuming that
the dot is a perfect sphere, calculate how many Cd atoms are in one quantum dot of this size.

e. If you wanted to make one 6.5-nm dot from multiple 2.5-hm dots, how many 2.5-nm dots
would you need, and how many CdSe formula units would be left over, if any?

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Chapter 3, Problem 90AE

Chapter 3, Problem 92AE

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Chapter 3 Solutions

Chemistry: The Central Science (14th Edition)

Ch. 3.1 - In the following diagram, the white spheres...Ch. 3.1 - In the following digram, the white spheres...Ch. 3.1 - The unbalanced equation for the reaction between...Ch. 3.1 - Balance these equations by providing the missing...Ch. 3.2 - Which of the following reactions is the balanced...Ch. 3.2 - Write a balanced equation for (a) solid...Ch. 3.2 - Write the balanced equation for the reaction that...Ch. 3.2 - Prob. 3.4.2PE Ch. 3.3 - Which of the following is the correct formula...Ch. 3.3 - Prob. 3.5.2PE

Ch. 3.3 - What is the percentage of nitrogen, by mass, in...Ch. 3.3 - Calculate the percentage of potassium by mass in...Ch. 3.4 - Which of the following samples contains the fewest...Ch. 3.4 - Without using a calculator, arrange these samples...Ch. 3.4 - How many sulfur are in (a) 0.45 mol BaSo4 and (b)...Ch. 3.4 - How many oxygen atoms are in (a) 0.25 mol...Ch. 3.4 - A sample of an ionic compound containing iron and...Ch. 3.4 - Calculate the molar mass of Ca(NO3)2 Ch. 3.4 - A 508-g sample of sodium bicarbonate (NaHCO3)...Ch. 3.4 - Prob. 3.10.2PE Ch. 3.4 - What is the mass, in grams, of 6.33 mol of NaHC03...Ch. 3.4 - What is the mass, in grams, of (a) 0.50 mol of...Ch. 3.4 - How many chlorine atoms are in 12.2 g of CCL4? a....Ch. 3.4 - a. How many nitric acid molecules are in 4.20 g...Ch. 3.5 - A 2.144-g sample of phosgene, a compound used as a...Ch. 3.5 - A 5.325-g sample of methyl benzoate, a compound...Ch. 3.5 - Cyclohexane a commonly used organic solvent, is...Ch. 3.5 - Prob. 3.14.2PE Ch. 3.5 - The compound dioxane, which is used as a solvent...Ch. 3.5 - a. Caproic acid, responsible for the odor of...Ch. 3.6 - Sodium hydroxide reacts with carbon dioxide to...Ch. 3.6 - Decomposition of KCIO3 is sometimes used to...Ch. 3.6 - Propane, C3 H8 (Figure 3.8), is a common fuel used...Ch. 3.6 - Methanol, CH3OH, reacts with oxygen from air in a...Ch. 3.7 - When 24 mol of methanol and 15 mol of oxygen...Ch. 3.7 - a. When 1.50 mol of Al and 3.00 mol of Cl2 combine...Ch. 3.7 - Molten gallium reacts with arsenic to form the...Ch. 3.7 - When a 2.00-g strip of zinc metal is placed in...Ch. 3.7 - If 3.00 g of titanium metal is reacted with 6.00 g...Ch. 3.7 - Imagine you are working on ways to improve the...Ch. 3 - The reaction between reactant A (blue spheres) and...Ch. 3 - The following diagram shows the combination...Ch. 3 - 3.3 The following diagram represents the...Ch. 3 - 3.4 The following diagram represents the...Ch. 3 - Glycine, an amino acid used by organisms to make...Ch. 3 - The following diagram represents a...Ch. 3 - 3.7 Nitrogen (N2) and hydrogen (H2) react to form...Ch. 3 - 3.8 Nitrogen monoxide and oxygen react to form...Ch. 3 - Write "true" or "false" for each statement. a. We...Ch. 3 - A key step in balancing chemical equations is...Ch. 3 - Balance the following equations: a. CO(g)...Ch. 3 - Balance the following equations 3. Li(s) + N2(g)...Ch. 3 - 3.13 Balance the following equations: A14C3(s) +...Ch. 3 - 3.14 Balance the following equations: a. Ca3P2(s)...Ch. 3 - 3.15 Write balanced chemical equations...Ch. 3 - Prob. 16E Ch. 3 - Prob. 17E Ch. 3 - 318 a. When a compound containing C, H, and O is...Ch. 3 - Write a balanced chemical equation for the...Ch. 3 - 3.20 Write a balanced chemical equation for the...Ch. 3 - Balance the following equations and indicate...Ch. 3 - Balance the following equations and indicate...Ch. 3 - Determine the formula weights of each of the...Ch. 3 - 3.24 Determine the formula weights of each of the...Ch. 3 - Calculate the percentage by mass of oxygen in the...Ch. 3 - Calculate the percentage by mass of the indicated...Ch. 3 - Based on the following structural formulas,...Ch. 3 - Calculate the percentage of carbon by mass In each...Ch. 3 - Write "true' or 'Yalse' for each statement a- A...Ch. 3 - a. What is the mass, in grams, of one mole of 12C?...Ch. 3 - Without doing any detailed calculations (but using...Ch. 3 - Without doing any detailed calculations {but using...Ch. 3 - What is the mass, m Iqlograms, of an Avogadro“s...Ch. 3 - If Avogadro’s number of pennies is divided equally...Ch. 3 - Calculate the following quantities: a. mass, in...Ch. 3 - Calculate the following quantities: a. mass, in...Ch. 3 - a. What is the mass, in grams, of 2.50 x 10-3 mol...Ch. 3 - a. What is the mass, in grams, of 1.223 mol of...Ch. 3 - 339 The molecular formula of allicin, the...Ch. 3 - 3.40 The molecular formula of aspartame, the...Ch. 3 - 3.41 A sample of glucose, C6H12O6, contains 1.250...Ch. 3 - A sample of the male sex hormone testosterone,...Ch. 3 - 343 The allowable concentration level of vinyl...Ch. 3 - At least 25 g oftetrahydrocannabinol (THC), the...Ch. 3 - Give the empirical formula of each of the...Ch. 3 - Determine the empirical formula of each of the...Ch. 3 - Determine the empirical formulas of the compounds...Ch. 3 - Determine the empirical formulas of the compounds...Ch. 3 - 3.49 A compound whose empirical formula is XF3...Ch. 3 - The compound XCL4contains 75.0% CI by mass What is...Ch. 3 - 3.51 What is the molecular formula of each of the...Ch. 3 - What is the molecular formula of each of the...Ch. 3 - Determine the empirical and molecular formulas of...Ch. 3 - Determine the empirical and molecular formulas of...Ch. 3 - a. Combustion analysis of toluene, a common...Ch. 3 - a. The characteristic odor of pineapple is due to...Ch. 3 - 3.57 Valproic acid, used to treat seizures and...Ch. 3 - Propenoic acid, C3H4O2, is a reactive organic...Ch. 3 - 3.59 Washing soda, a compound used to prepare...Ch. 3 - 3.60 Epsom salts, a strong laxative used in...Ch. 3 - f 3461 Hydrofluoric acid, HF(aq), cannot be stored...Ch. 3 - The reaction between potassium superoxide, KO2,...Ch. 3 - 3,63 Several brands of antacids use Al(OH)3 to...Ch. 3 - 3.64 An iron ore sample contains Fe2O3 together...Ch. 3 - Aluminum sulfides reacts with water to form...Ch. 3 - Calcium hydride reacts with water to form calcium...Ch. 3 - 3.67 Automotive air bags infilate when sodium...Ch. 3 - The complete combustion of octane, Cngs, a...Ch. 3 - 3.69 A piece of aluminum foil 1.00 cm2 and...Ch. 3 - Detonation of nitroglycerin proceeds as follows:...Ch. 3 - 3.71 The combustion of one mole of liquid...Ch. 3 - The combustion of one mole of liquid octane,...Ch. 3 - a. Define the terms limiting reactant and excess...Ch. 3 - Define the terms theoretical yield, actual yield,...Ch. 3 - 3-75 Consider the mixture of ethanol, C2H5OH, and...Ch. 3 - Consider the mixture of propane, C3H8, and O2...Ch. 3 - 3-77 Sodium hydroxide reacts with carbon doxidc...Ch. 3 - 3.78 Aluminum hydroxide reacts with sulfuric acid...Ch. 3 - The fizz produced when an Alka-Seltzer tablet is...Ch. 3 - One of the steps in the commercial procas for...Ch. 3 - Solutions of sodium carbonate and silver nitrate...Ch. 3 - Solutions of sulfuric acid and Iead (ll) acetate...Ch. 3 - When benzene (C6H6) reacts with bromine (Br2),...Ch. 3 - When ethane (C6H6) reacts with chlorine (Cl2), the...Ch. 3 - 3.85 Hydrogen sulfide is an impurity in natural...Ch. 3 - 386 When hydrogen sulfide gas is bubbled into a...Ch. 3 - 387 Write the balanced chemical equations for a....Ch. 3 - If 1.5 mol C2H5OH, 1.5 mol C3H8, and 1.5 mol...Ch. 3 - 3.89 The effectiveness of nitrogen fertilizers...Ch. 3 - 3.90 a. The molecular formula of acetylsalicylic...Ch. 3 - Very small semiconductor crystals, composed of...Ch. 3 - a. One molecule of the antibiotic penicillin G has...Ch. 3 - Serotonin is a compound that conducts nerve...Ch. 3 - 3.94 The koala dines exclusively on eucalyptus...Ch. 3 - 3.95 Vanillin, the dominant flavoring in vanilla,...Ch. 3 - 3.96 An organic compound was found to contain...Ch. 3 - 3.97 A compound, KBrO,, where x is unknown, is...Ch. 3 - 398 An element X forms an iodide (X13) and a...Ch. 3 - A method used by the U.S. Environmental Protection...Ch. 3 - 3.100 A chemical plant uses electrical energy to...Ch. 3 - The fat stored in a camel’s hump is a source of...Ch. 3 - 3.102 When hydrocarbons are burned in a limited...Ch. 3 - 3.103 A mixture of N2(g) and H2(g) reacts in a...Ch. 3 - 3.104 A mixture containing KClO3, K2CO3, KHCO3,...Ch. 3 - When a mixture of 10.0 g of acetylene (C2H2) and...Ch. 3 - 3.106 The semiconductor gallium arsenide, GaAs,...Ch. 3 - 3.107 Paclitaxel, C47H51NO14, is an anticancer...Ch. 3 - 3.108 Consider a sample of calcium carbonate in...Ch. 3 - 3.109 a. You are given a cube of silver metal...Ch. 3 - 3.110 a. If an automobile travels 225 mi with a...Ch. 3 - Prob. 111IE Ch. 3 - 3.112 A particular coal contains 2.596 sulfur by...Ch. 3 - Hydrogen cyanide, HCN, is a poisonous gas. The...Ch. 3 - 3.114 The source of oxygen that drives he...Ch. 3 - 3.115 The therrnite reaction, Fe2O3 +Al Al2O3 +...Ch. 3 - 3.116 One of the most bizarre reactions in...

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