Chemistry & Chemical Reactivity
9th Edition
ISBN: 9781305176461
Author: Kotz
Publisher: Cengage
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Textbook Question
Chapter 2, Problem 136GQ
Stibnite, Sb2S3, is a dark gray mineral from which antimony metal is obtained. What is the mass percent of antimony in the sulfide? If you have 1.00 kg of an ore that contains 10.6% antimony, what mass of Sb2S3 (in grams) is in the ore?
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Part I. Problem solving. Include all necessary calculations 13 provide plots and graphs.
Complexation wl diphenyl carbazide (OPC) in acidic media is another type of sensitive photometric method used for the analysis of aqueous.
hexavalent chromium. At 540nm the cherry-red complex as a result of DPC reaction w/ chromium can be photometrically measured.
at this wavelength.
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a 25mL
The UV-vis analysis for the determination of nexavalent chromium in ground water sample is given below. The experiment was based
on external calibration method w/ each measurement sample prepared are as follows
lab sample analysis contained the standard
100 ppb croy cor groundwater sample, volumes used as indicated below), 12.50 mL of 0.02 M H2Soy and 5.50 ml of 100 ppm DPC (wi
water to adjust final volume to 25-ml). The main stripping method was square wave voltammetry, following the conditions set
in the main ASV experiment.
Standard 100
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H2SO4 0.20 M,
flask
Sample, mL
ppb CrO4*,
100…
Chapter 2 Solutions
Chemistry & Chemical Reactivity
Ch. 2.2 - 1. What is the mass of an iron atom with 30...Ch. 2.2 - 1. The mass of an atom of manganese is 54.9380 u....Ch. 2.2 - An atom contains 12 neutrons and has a mass number...Ch. 2.3 - 1. Silver has two isotopes, one with 60 neutrons...Ch. 2.3 - 2. A naturally occurring sample of argon contains...Ch. 2.4 - Verify that the atomic weight of chlorine is...Ch. 2.4 - Neon has three stable isotopes, one with a small...Ch. 2.4 - 1. Which is the more abundant isotope of copper,...Ch. 2.4 - 2. Which of the following is closest to the...Ch. 2.4 - Prob. 3RC
Ch. 2.5 - Prob. 1QCh. 2.5 - Prob. 2QCh. 2.5 - Which of the following elements is a metalloid?...Ch. 2.5 - Prob. 2RCCh. 2.5 - Prob. 3RCCh. 2.5 - Prob. 4RCCh. 2.6 - Prob. 1RCCh. 2.7 - Give the number and identity of the constituent...Ch. 2.7 - (a) Write the formulas of all neutral ionic...Ch. 2.7 - Prob. 1RCCh. 2.7 - Prob. 2RCCh. 2.7 - Prob. 3RCCh. 2.7 - The formula of barium acetate is (a) Ba(CH3CO2)2...Ch. 2.7 - 5. The name of the compound with the formula V2O3...Ch. 2.7 - Which should have the higher melting point, MgO or...Ch. 2.8 - Prob. 1RCCh. 2.8 - Prob. 2RCCh. 2.8 - Prob. 3RCCh. 2.8 - Prob. 4RCCh. 2.9 - The density of gold, Au, is 19.32 g/cm3. What is...Ch. 2.9 - If you have 454 g of citric acid (H3C6H5O7), what...Ch. 2.9 - Prob. 1RCCh. 2.9 - Which of the following contains the largest number...Ch. 2.9 - Which of the following has the largest mass? (a)...Ch. 2.9 - Prob. 4RCCh. 2.9 - Prob. 5RCCh. 2.10 - 1. Express the composition of ammonium carbonate,...Ch. 2.10 - 1. What is the empirical formula of naphthalene,...Ch. 2.10 - Gallium oxide, GaxOy forms when gallium is combine...Ch. 2.10 - Hydrated nickel(II) chloride is a beautiful green,...Ch. 2.10 - Prob. 1QCh. 2.10 - Salvarsan was long thought to be a single...Ch. 2.10 - To determine the density of atmospheric nitrogen....Ch. 2.10 - The density of a mixture of gases may be...Ch. 2.10 - Atmospheric argon is a mixture of three stable...Ch. 2.10 - Given that the density of argon is 1.78 g/L under...Ch. 2.10 - 1. Which of the following hydrocarbons has the...Ch. 2.10 - 2. An organic compound has an empirical formula...Ch. 2.10 - Eugenol is the major component in oil of cloves....Ch. 2.10 - 4. Epsom salt is MgSO4 · 7H2O. When heated to 70...Ch. 2 - Prob. 1PSCh. 2 - Define mass number. What is the difference between...Ch. 2 - An atom has a very small nucleus surrounded by an...Ch. 2 - A gold atom has a radius of 145 pm. If you could...Ch. 2 - Give the complete symbol(ZAX), including atomic...Ch. 2 - Give the complete symbol(ZAX), including atomic...Ch. 2 - Prob. 7PSCh. 2 - Atomic structure. (a) The synthetic radioactive...Ch. 2 - Prob. 9PSCh. 2 - In 1886 Eugene Goldstein observed positively...Ch. 2 - Marie Curie was born in Poland but studied and...Ch. 2 - Prob. 12PSCh. 2 - The mass of an 16 O atom is 15.995 u. What is its...Ch. 2 - What is the mass of one 16O atom, in grams? (The...Ch. 2 - Cobalt has three radioactive isotopes used in...Ch. 2 - Naturally occurring silver exists as two isotopes...Ch. 2 - Name and describe the composition of the three...Ch. 2 - Which of the following are isotopes of element X,...Ch. 2 - Thallium has two stable isotopes, 203TIand 205Tl....Ch. 2 - Strontium has four stable isotopes. Strontium-84...Ch. 2 - Verify that the atomic weight of lithium is 6.94,...Ch. 2 - Verify that the atomic weight of magnesium is...Ch. 2 - Gallium has two naturally occurring isotopes, 69Ga...Ch. 2 - Europium has two stable isotopes, 151Eu and 153Eu,...Ch. 2 - Titanium and thallium have symbols that are easily...Ch. 2 - In Groups 4A-6A, there are several elements whose...Ch. 2 - How many periods of the periodic table have 8...Ch. 2 - Prob. 28PSCh. 2 - Prob. 29PSCh. 2 - Prob. 30PSCh. 2 - Classify the following elements as metals,...Ch. 2 - Prob. 32PSCh. 2 - Prob. 33PSCh. 2 - Prob. 34PSCh. 2 - What is the charge on the common monatomic ions of...Ch. 2 - What is the charge on the common monatomic ions of...Ch. 2 - Prob. 37PSCh. 2 - Prob. 38PSCh. 2 - When a potassium atom becomes a monatomic ion, how...Ch. 2 - When oxygen and sulfur atoms become monatomic...Ch. 2 - Prob. 41PSCh. 2 - Prob. 42PSCh. 2 - Give the formula and the number of each ion that...Ch. 2 - Give the formula and the number of each ion that...Ch. 2 - Prob. 45PSCh. 2 - Prob. 46PSCh. 2 - Prob. 47PSCh. 2 - Prob. 48PSCh. 2 - Prob. 49PSCh. 2 - Prob. 50PSCh. 2 - Prob. 51PSCh. 2 - Prob. 52PSCh. 2 - Write the formulas for the four ionic compounds...Ch. 2 - Write the formulas for the four ionic compounds...Ch. 2 - Sodium ions, Na+, form ionic compounds with...Ch. 2 - Consider the two ionic compounds NaCl and CaO. In...Ch. 2 - Prob. 57PSCh. 2 - Name each of the following binary, nonionic...Ch. 2 - Prob. 59PSCh. 2 - Prob. 60PSCh. 2 - Calculate the mass, in grams, of each the...Ch. 2 - Calculate the mass, in grams, of each the...Ch. 2 - Calculate the amount (moles) represented by each...Ch. 2 - Calculate the amount (moles) represented by each...Ch. 2 - You are given 1.0-g samples of He, Fe, Li, Si, and...Ch. 2 - You are given 0.10-g samples of K, Mo, Cr, and Al....Ch. 2 - Analysis of a 10.0-g sample of apatite (a major...Ch. 2 - A semiconducting material is composed of 52 g of...Ch. 2 - Calculate the molar mass of each of the following...Ch. 2 - Calculate the molar mass of each of the following...Ch. 2 - Calculate the molar mass of each hydrated...Ch. 2 - Prob. 72PSCh. 2 - What mass is represented by 0.0255 mol of each of...Ch. 2 - Assume you have 0.123 mol of each of the following...Ch. 2 - Sulfur trioxide, SO3, is made industrially in...Ch. 2 - How many ammonium ions and how many sulfate ions...Ch. 2 - Acetaminophen, whose structure is drawn below, is...Ch. 2 - An Alka-Seltzer tablet contains 324 mg of aspirin...Ch. 2 - Calculate the mass percent of each element in the...Ch. 2 - Calculate the mass percent of each element in the...Ch. 2 - Calculate the mass percent of copper in CuS,...Ch. 2 - Calculate the mass percent of titanium in the...Ch. 2 - Succinic acid occurs in fungi and lichens. Its...Ch. 2 - An organic compound has the empirical formula...Ch. 2 - Prob. 85PSCh. 2 - Complete the following table:Ch. 2 - Acetylene is a colorless gas used as a fuel in...Ch. 2 - A large family of boron-hydrogen compounds has the...Ch. 2 - Cumene, a hydrocarbon, is a compound composed only...Ch. 2 - In 2006, a Russian team discovered an interesting...Ch. 2 - Mandelic acid is an organic acid composed of...Ch. 2 - Nicotine, a poisonous compound found in tobacco...Ch. 2 - A compound containing xenon and fluorine was...Ch. 2 - Elemental sulfur (1.256 g) is combined with...Ch. 2 - Epsom salt is used in tanning leather and in...Ch. 2 - You combine 1.25 g of germanium, Ge, with excess...Ch. 2 - Fill in the blanks in the table (one column per...Ch. 2 - Potassium has three naturally occurring isotopes...Ch. 2 - Crossword Puzzle: In the 2 2 box shown here, each...Ch. 2 - The following chart shows a general decline in...Ch. 2 - Copper atoms. (a) What is the average mass of one...Ch. 2 - Prob. 102GQCh. 2 - Prob. 103GQCh. 2 - Identify two nonmetallic elements that have...Ch. 2 - Prob. 105GQCh. 2 - Prob. 106GQCh. 2 - Prob. 107GQCh. 2 - When a sample of phosphorus burns in air, the...Ch. 2 - Although carbon-12 is now used as the standard for...Ch. 2 - A reagent occasionally used in chemical synthesis...Ch. 2 - Prob. 111GQCh. 2 - Prob. 112GQCh. 2 - Which of the following compounds has the highest...Ch. 2 - Which of the following samples has the largest...Ch. 2 - The structure of one of the bases in DNA, adenine,...Ch. 2 - Prob. 116GQCh. 2 - A drop of water has a volume of about 0.050 mL....Ch. 2 - Capsaicin, the compound that gives the hot taste...Ch. 2 - Prob. 119GQCh. 2 - Write the molecular formula and calculate the...Ch. 2 - Malic acid, an organic acid found in apples,...Ch. 2 - Your doctor has diagnosed you as being anemicthat...Ch. 2 - A compound composed of iron and carbon monoxide,...Ch. 2 - Ma huang, an extract from the ephedra species of...Ch. 2 - Saccharin, a molecular model of which is shown...Ch. 2 - Prob. 126GQCh. 2 - Write the formula for each of the following pounds...Ch. 2 - Complete the table by placing symbols, formulas,...Ch. 2 - Empirical and molecular formulas. (a)...Ch. 2 - Cacodyl, a compound containing arsenic, was...Ch. 2 - The action of bacteria on meat and fish produces a...Ch. 2 - In the laboratory you combine 0.125 g of nickel...Ch. 2 - A compound called MMT was once used to boost the...Ch. 2 - Elemental phosphorus is made by heating calcium...Ch. 2 - Chromium is obtained by heating chromium(III)...Ch. 2 - Stibnite, Sb2S3, is a dark gray mineral from which...Ch. 2 - Direct reaction of iodine (I2) and chlorine (Cl2)...Ch. 2 - In a reaction, 2.04 g of vanadium combined with...Ch. 2 - Iron pyrite, often called fools gold, has the...Ch. 2 - Which of the following statements about 57.1 g of...Ch. 2 - The formula of barium molybdate is BaMoO4. Which...Ch. 2 - A metal M forms a compound with the formula MCl4....Ch. 2 - Pepto-Bismol, which can help provide relief for an...Ch. 2 - The weight percent of oxygen in an oxide that has...Ch. 2 - The mass of 2.50 mol of a compound with the...Ch. 2 - The elements A and Z combine to produce two...Ch. 2 - Polystyrene can be prepared by heating styrene...Ch. 2 - A sample of hemoglobin is found to be 0.335% iron....Ch. 2 - Consider an atom of 64Zn. (a) Calculate the...Ch. 2 - Estimating the radius of a lead atom. (a) You are...Ch. 2 - A piece of nickel foil, 0.550 mm thick and 1.25 cm...Ch. 2 - Uranium is used as a fuel, primarily in the form...Ch. 2 - In an experiment, you need 0.125 mol of sodium...Ch. 2 - Mass spectrometric analysis showed that there are...Ch. 2 - The mass spectrum of CH3Cl is illustrated here....Ch. 2 - Prob. 156GQCh. 2 - If Epsom salt, MgSO4 x H2O, is heated to 250 C,...Ch. 2 - The alum used in cooking is potassium aluminum...Ch. 2 - Tin metal (Sn) and purple iodine (I2) combine to...Ch. 2 - When analyzed, an unknown compound gave these...Ch. 2 - Two general chemistry students working together in...Ch. 2 - To find the empirical formula of tin oxide, you...Ch. 2 - Prob. 163SCQCh. 2 - Prob. 164SCQCh. 2 - The photo here depicts what happens when a coil of...Ch. 2 - A jar contains some number of jelly beans. To find...
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