A 360. mg sample of aspirin, C9H8O4, (molar mass 180. g), is dissolved in enough water to produce 200. mL of solution. Represents an atom that is chemically unreactive, The substance is at its normal freezing point at time. One holds 0.50 gram of hydrogen and the other holds 8.0 grams of oxygen. The safest and most effective emergency procedure to treat an acid splash on skin is to do which of the following immediately? Which of the following represents a pair of isotopes? Adding a weighed quantity of solid acid to a titration flask wet with distilled water. The vapor pressure of the acetone is, the same in both because the temperature is the same, Has the greatest rate of effusion through a pinhole, 2 MnO4-(aq) + 10 Br -(aq) + 16 H+(aq) 2 Mn2+(aq) + 5 Br2(aq) + 8 H2O(l). The recorded measurements are shown in the table above. Given that there are only two naturally occurring isotopes of copper, 63Cu and 65Cu, the natural abundance of the 65Cu isotope must be approximately. (R = 0.0821 liter-atm / mole-K), As the temperature is raised from 20 ° C to 40 ° C, the average kinetic energy of neon atoms changes by a factor of, What number of moles of O2 is needed to produce 14.2 grams of P4O10 from P? Find the training resources you need for all your activities. Appropriate uses of a visible-light spectrophotometer include which of the following? If the pressure remains unchanged, the final temperature of the gas is. The volume of hydrogen gas produced at standard temperature and pressure is. A 27.0-gram sample of an unknown hydrocarbon was burned in excess oxygen to form 88.0 grams of carbon dioxide and 27.0 grams of water. The product is a colorless solution and colorless gas bubbles. When the equation for this reaction is correctly balanced and all coefficients are reduced to their lowest whole-number term, the coefficient for O2 is, 10 HI + 2 KMnO4 + 3 H2SO4 5 I2 + 2 MnSO4 + K2SO4 + 8 H2O. HCl (aq) + Na2CO3 (aq) ( H2O (l) + CO2 (g) + ?? Find the training resources you need for all your activities. Which of the following aqueous solutions has the highest boiling point? Given that a solution is 5 percent sucrose by mass, what additional information is necessary to calculate the molarity of the solution? Represents an atom that has four valence electrons. (Assume that AgCl is insoluble.). Assume that you have an "unknown" consisting of an aqueous solution of a salt that contains one of the ions listed below. A 2 L container will hold about 4 g of which of the following gases at 0oC and 1 atm? ...CrO2¯ + ...OH¯ ... CrO42¯ + ... H2O + ... e¯ When the equation for the half-reaction above is balanced, what is the ratio of the coefficients OH¯ / CrO2¯ ? Which ions must be absent on the basis of each of the following observations of the "unknown"? . Which of the following statements accounts for this increase? What is the partial pressure of He if the total pressure in the container is 6 atm? Which of the following molecules has a dipole moment of zero? In which of the following groups are the three species isoelectronic; i.e., have the same number of electrons? In which of the following processes are covalent bonds broken? If the temperature of the system remains constant, which of the following statements about the partial pressure of gas X is correct? A sample of 9.00 grams of aluminum metal is added to an excess of hydrochloric acid. The total pressure of the gases in the flask is 800 mm Hg. By calculating ∆S, ∆Ssurroundings and ∆Stotal , verify that this transformation is spontaneous at –2.25ºC. How many grams of calcium nitrate, Ca(NO3)2, contains 24 grams of oxygen atoms? The pressure, in atm, exerted by 1.85 mol of an ideal gas placed in a 3.00 L container at 35.0ºC is given by which of the following expressions? What mass of Au is produced when 0.0500 mol of Au2S3 is reduced completely with excess H2? To ensure the best experience, please update your browser. .....Mg(s) + .....NO3¯(aq) +.....H+(aq) --->......Mg2+(aq) + ....NH4+(aq) + ....H2O(l), The system shown above is at equilibrium at 28 °C. The pipette was not rinsed with the HCl solution. When a sample of oxygen gas in a closed container of constant volume is heated until its absolute temperature is doubled, which of the following is also doubled? Equal masses of three different ideal gases, X, Y, and Z, are mixed in a sealed rigid container. The correct value for the percentage of water in the hydrate is 51 percent. Each sample was then titrated with a sodium hydroxide solution to the appearance of the first permanent faint pink color. Of the following pure substances, which has the highest melting point? the molality of the solution remains unchanged. (The molar mass of C2H5OH is 46 g; the molar mass of H2O is 18 g.), ___C10H12O4S (s) + ___O2 (g) ___CO2 (g) + ___SO2 (g) + ___H2O (g). A flask contains 0.25 mole of SO2(g), 0.50 mole of CH4(g), and 0.50 mole of O2(g). What is the molar concentration of OH-(aq) in the resulting solution? What is a possible molecular formula of the hydrocarbon? When hafnium metal is heated in an atmosphere of chlorine gas, the product of the reaction is found to contain 62.2 percent Hf by mass and 37.4 percent Cl by mass. H2Se (g) + 4 O2F2 (g) SeF6 (g) + 2 HF (g) + 4 O2 (g), the oxidation number of Se changes from -2 to +6, Lattice of positive and negative ions held together by electrostatic forces. ...H+(aq) + ...NO2-(aq) + ... Cr2O72-(aq) ...Cr3+(aq) + ...NO3-(aq) + ...H2O(l). The formula of the hydrate is, CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l); H = - 889.1 kJ, The net ionic equation for the reaction between silver carbonate and hydrochloric acid is, 2 Ag+ + CO32¯ + 2 H+ + 2 Cl¯ --> 2 AgCl(s) + H2O + CO2(g), The geometry of the SO3 molecule is best described as. General Chemistry Problems FIFTH EDITION. Explanations for this observation include which of the following? A possible atomic weight of Q is, Is used to explain the fact that the four bonds in methane are equivalent, The simplest formula for an oxide of nitrogen that is 36.8 percent nitrogen by weight is. Which element exhibits the greatest number of different oxidation states? Strong multiple covalent bonds (including p-bonds) with weak intermolecular forces. The sample starts as a gas, and heat is removed at a constant rate. Get all of Hollywood.com's best Celebrities lists, news, and more. Molecules that have planar configurations include which of the following? The alkenes are compounds of carbon and hydrogen with the general formula CnH2n. What is the final concentration of barium ions, [Ba2+], in solution when 100. mL of 0.10 M BaCl2(aq) is mixed with 100. mL of 0.050 M H2SO4(aq)?What is the final concentration of barium ions, [Ba2+], in solution when 100. mL of 0.10 M BaCl2(aq) is mixed with 100. mL of 0.050 M H2SO4(aq)? The freezing temperature of water at this pressure is 0.00ºC. 3 Cu(s) + 8 H+(aq) + 2 NO3-(aq) 3 Cu2+(aq) + 2 NO(g) + 4 H2O(l). At 25 °C and 1 atm, has molecules with a pyramidal shape. What is the hybridization of the carbon atom in a molecule of ethyne, represented above? Represents an atom of a transition metal. This fractional crystalization is possible because substances X and Y have different, The net ionic equation for the reaction that occurs during the titration of nitrous aicd with sodium hydroxide is, A solution is known to contain an inorganic salt of one of the following elements. An oxidation-reduction reaction that is also a synthesis reaction. At 25°C and 1 atm, is a strong electrolyte in aqueous solution. A hot-air balloon rises. What is the molarity of aspirin in a 50. mL sample of this solution? The Lewis dot structure of which of the following molecules shows only one unshared pair of valence electron? Which of the following ions has the same number of electrons as Br? Which of the following applies to the gas in the tank when additional oxygen is added at constant temperature? just pick the picture that has 2NH3 and 2H2. If 0.40 mol of H2 and 0.15 mol of O2 were to react completely as possible to produce H2O, what mass of reactant would remain? The elements in which of the following have most nearly the same atomic radius? H2O and different impurities of a neutral salt consumed 18.9 ml of 0.5 N NaOH solution. Conway Pierce Late of University of California Riverside. Can be used to predict that a gaseous carbon atom in its ground state is paramagnetic, Hund's rule (principle of maximum multiplicity), The ground-state configuration of a negative ion of a halogen, 5 Fe2+ + MnO4¯ + 8 H+ 5 Fe3+ + Mn2+ + 4 H2O, When 70. milliliter of 3.0-molar Na2CO3 is added to 30. milliliters of 1.0-molar NaHCO3 the resulting concentration of Na+ is, The mass of element Q found in 1.00 mole of each of four different compounds is 38.0 grams, 57.0 grams, 76.0 grams, and 114 grams, respectively. 42.8 grams of KIO3 and add 2.00 kilograms of H2O d. 42.8 grams of KIO3 and add 2.00 liters of H2O b. Which of the following molecules contains only single bonds? H3AsO3(aq) + . . Equal masses of He and Ne are placed in a sealed container. Is used to explain why the boiling point of HF is greater than the boiling point of HBr. . At 0oC and 1 atm pressure, what volume of H2 gas can be obtained? An excess of Mg(s) is added to 100. mL of 0.400 M HCl. The cooling curve above shows how the temperature of a sample varies with time as the sample goes through phase changes. Which of the following molecules has an angular (bent) geometry that is commonly represented as a resonance hybrid of two or more electron-dot structures? CH3CH2OH boils at 78 °C and CH3OCH3 boils at - 24 °C, although both compounds have the same composition. Barium carbonate precipitates. OH¯ . The molecule that has trigonal pyramidal geometry. Which of the following measure of concentration changes with temperature? Of the following molecules, which has the largest dipole moment? F- has a larger nuclear charge than O2- has. . 2 H2O(l) + 4 MnO4-(aq) + 3 ClO2-(aq) 4 MnO2(s) + 3 ClO4-(aq) + 4 OH-(aq). The metal calcium reacts with molecular hydrogen to form a compound. Hydrogen bonds between H2O molecules are broken. If the rock contained no carbonate other than CaCO3 , what was the percent of CaCO3 by mass in the limestone? Which of the following molecules has the shortest bond length? What is the maximum mass of SO2 that could be removed by 1,000 liters of the KOH solution? The mole fraction of CH3OH in this solution is closest to which of the following? How many carbon atoms are contained in 2.8 g of C2H4? ...Fe(OH)2 + ... O2 + ... H2O ... Fe(OH)3, Pi bonding occurs in each of the following species EXCEPT. On the basis of this information, to how many significant figures should the density of the liquid be reported? H2O. BRILLIANT PUBLIC SCHOOL, SITAMARHI (Affiliated up to +2 level to C.B.S.E., New Delhi) Class-XI IIT-JEE Advanced Chemistry Study Package Session: 2014-15 Office: Rajopatti, Dumra Road, Sitamarhi (Bihar), Pin-843301 Ph.06226-252314 , Mobile:9431636758, 9931610902 Website: www.brilliantpublicschool.com; E-mail: [email protected][email protected] the positive charge of an atom is concentrated in a small region. Flush the affected area with water and then with a dilute NaHCO3 solution, Ionization Energies for the element X (kJ mol-1). It depends on the relative molecular masses of X, Y, and Z. A 20.0-milliliter sample of 0.200-molar K2CO3 solution is added to 30.0 milliliters of 0.400-molar Ba(NO3)2 solution. The SbCl5 molecule has trigonal bipyramid structure. A mixture of reactants and product at 1400 K contains 0.035 M H2O… In which of the following compounds is the mass ratio of chromium to oxygen closest to 1.62 to 1.00 ? How many mL of 10.0 M HCl are needed to prepare 500. mL of 2.00 M HCl? Which of the following shows the correct number of protons, neutrons, and electrons in a neutral cesium-134 atom? Samples of F2 gas and Xe gas are mixed in a container of fixed volume. A student measure the mass of a clean, dry 25.00 mL volumetric flask, filled the flask to its calibration mark with the liquid, and then measured the mass of the flask and the liquid. If 87 g of K2SO4 (molar mass 174 g) is dissolved in enough water to make 250 mL of solution, what are the concentrations of potassium and sulfate ion respectively? Which of the following oxides is a gas at 25oC and 1 atm? Substances X and Y that were in a solution were separated in the laboratory using the technique of fractional crystalization. A rigid metal tank contains oxygen gas. What is the mole fraction of ethanol, C2H5OH, in an aqueous solution that is 46% ethanol by mass? We would like to show you a description here but the site won’t allow us. Which of the following pieces of laboratory glassware should be used to most accurately measure out a 25.00 mL sample of a solution, Are the most difficult to iodize in a given period of the periodic table. The relatively high boiling point of HF can be correctly explained by which of the following? The solution contains a salt of. Which of the following could explain why the student obtained a molar mass that was too LARGE? The dehydrated sample absorbed moisture after heating. The ground-state configuration of a common ion of an alkaline earth element, Indicates that an atomic orbital can hold no more than two electrons. . Types of hybridization exhibited by the C atoms in propene, CH3CHCH2, include which of the following? The following measurements were made. On the basis of the solubility curves shown above, the greatest percentage of which compound can be recovered by cooling a saturated solution of that compound from 90o to 30o? According to the VSEPR model, the progressive decrease in the bond angles in the series of molecules CH4, NH3, and H2O is best accounted for by the, increasing the number of unshared pairs of electrons, At standard temperature and pressure, a 0.50 mol sample of H2 gas and a separate 1.0 mol sample of O2 gas have the same, ___Li3N (s) + ___H2O (l) ___Li+ (aq) + ___OH- (aq) + ___NH3 (g), The best explanation for the fact that diamond is extremely hard is that diamond crystals, are giant molecules in which each atom forms strong covalent bonds with all of its neighboring atoms.
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