Chemistry 9th Edition

Consider the reaction between Mg(s) and HCl(aq) to produce aqueous magnesium chloride and hydrogen gas. How many liters of hydrogen gas at STP will be produced when 12.15 g of magnesium reacts with an excess of hydrochloric acid? A)1.00 L B)2.00 L C)5.60 L D)11.2 L E)22.4 L Answer: D Answer: D Answer: D Select the correct electron configuration

Select the correct molecular structure for the given species from the choices below: SiH4 A)pyramidal B)tetrahedral C)square planar D)octahedral E)none of these Answer: B Answer: B Answer: B Referring to the structures below, which statement is true? A) I and II have different molecular formulas. B) I and III are structural isomers of each other. C) II and III are stereoisomers of

Determine (a) the rate equation and (b) the rate constant for the hypothetical reaction A+B-->C given the following initial concentrations and initial rate data. Answer: a) rate = k[A]2[B](b) 1.8 x102L2/mol2s a) Use method of initial rates to solve for exponents:4 = [2]n; n = 22 = [2]m; m = 1Therefore

When ignited, solid ammonium dichromate decomposes in a fiery display. This is the reaction for a "volcano" demonstration. The decomposition produces nitrogen gas, water vapor, and chromium(III) oxide. The temperature is constant at 25C Determine Suniv (in kJ/mol K). A) 7.66 B) 6.39 C) 84.3 D) 5.22 E) 6.03 Answer: A Answer: A Answer: A Calculate the [H+] in a

The following questions refer to the hypothetical reaction A + B --> products. The kinetics data given can be analyzed to answer the questions. What form will the pseudo-rate law have? A)Rate = k'[A]x B)Rate = k'[B]y C)Rate = k'[A]x[B]y D)Rate = kk'[A]x E)Rate = kk'[B]y Answer: A Answer: A Answer: A

The bond order in the NO molecule is A)1 B) C)2 D) E)3 Answer: D Answer: D Answer: D The bond angles about the carbon atom in the formaldehyde molecule, H2C=O, are about: A)120 B)60 C)109 D)180 E)90 Answer: A Answer: A Answer: A The standard temperature for gases is A)100C B)0C C)32C D)212F E)0F Answer: B Answer: B Answer: B The following questions refer to the hypothetical reaction A + B --> products. The kinetics data

A sample of a gas occupies a volume of 2.62 liters at 25 C and 1.00 atm. What will be the volume at 50.0 C and 2.00 atm? A)1.42 liters B)2.62 liters C)4.83 liters D)5.68 liters E)10.5 liters Answer: A Answer: A Answer: A Use the molecules below to answer the next three questions. Which molecule(s) have at least one

Consider the following information about the diprotic acid, ascorbic acid. (H2As for short, molar mass 176.1) H2As HAs-+ H+pKa= 4.10 (Ka= 7.9x10-5) HAs- As2-+ H+pKa= 11.79 (Ka= 1.6x10-12) The titration curve for disodium ascorbate, Na2As, with standard HCl is shown below: What is the pH at point I (V1/2 HCl added)? A) 4.10 B)

For each group of compounds listed, which is the strongest acid? I. HIO2, HIO3, HIO4 II. H2Se, H2S, H3As III. HPO2, HClO2, HBrO2 A) I. HIO2, H2Se, HBrO2 B) I. HIO4, H2Se, HBrO2 C) I. HIO2, H3As, HPO2 D) I. HIO3, H3As, HClO2 E) I. HIO4, H2Se, HClO2 Answer: E Answer: E Answer:

Which has these types of electromagnetic radiation arranged in order of decreasing energy? A)visible, ultraviolet, x-ray B)radiowaves, visible, ultraviolet C)ultraviolet, visible, infrared D)x-ray, visible, ultraviolet E)none of these Answer: C Answer: C Answer: C The following data were obtained for the reaction of NO with O2. Concentrations are in molecules/cm3and rates are in molecules/cm3's. What is the rate law? A)Rate = k[NO][O2] B)Rate

The Lewis structure for H3BO3is A) B) C) D) E) Answer: D Answer: D Answer: D Which of the following electron distributions among the molecular orbitals best describes the NO molecule? A)2 2 4 2 4 2 B)2 2 4 2 4 1 C)2 2 4 1 3 0 D)2 2 4 2 2 0 E)2 2 4 2 1 0 Answer: E Answer: E Answer:

What is the overall reaction for the production of hydrogen from methane and water? A) CH4(g) + H2O(g) --> CO(g) + 3 H2(g) B) CO(g) + H2O(g) --> CO2(g) + H2(g) C) CH4(g) + 2 H2O(g) --> CO2(g) + 4 H2(g) D) 2 CH4(g) + 3 H2O(g) --> CO(g) + CO2(g)

A sample of nitrous oxide, N2O, occupies 16,500 mL at STP. What is the mass of the sample? A)18.9 B)22.1 C)22.8 D)32.4 E)46.0 Answer: D Answer: D Answer: D Tetracyanoethylene has the skeleton shown below: From its Lewis structure determine the following: How many of the atoms are sp hybridized? A)2 B)4 C)6 D)8 E)10 Answer: D Answer: D Answer: D Which has these types of electromagnetic radiation arranged in

Determine the value of k (without units) for the reaction: C2H4Br2+ 3KI --> C2H4+ 2KBr +KI3, given the initial rate data below? A)0.149 B)0.538 C)0.0830 D)0.299 E)0.598 Answer: D Answer: D Answer: D The following data were collected for the decay of HO2radicals: Which of the following best describes the reaction? A)The decay of HO2occurs by a

What is the bond order of Ne2? A)0 B) C)1 D) E)2 Answer: A Answer: A Answer: A Using the following thermochemical data, calculate DHf of Tm2O3(s). 2TmCl3(s) + 3H2O(l) --> Tm2O3(s) + 6HCl(g)DH = 388.1 kJ/mol 2Tm(s) + 3Cl2(g) --> 2TmCl3(s)DH = -1973.2 kJ/mol 4HCl(g) + O2(g) --> 2Cl2(g) + 2H2O(l)DH = -202.4 kJ/mol A)-1888.7 kJ/mol B)-1787.5 kJ/mol C)2563.7 kJ/mol D)-2158.9 kJ/mol E)1382.7 kJ/mol Answer:

For each of the following solutions, describe the deviation with respect to Raoult's Law. acetone (C3H6O) and water A)relatively ideal B)positive deviation C)negative deviation D)more information needed E)none of these Answer: C Answer: C Answer: C How many of the following molecules or ions are linear? NH3OF2HCNCO2NO2 A)0 B)1 C)2 D)3 E)4 Answer: C Answer: C Answer: C What is the pH for a buffer that consists of 0.45

Which metal, Al or Ni could reduce Zn2+to Zn(s) if placed in a Zn2+(aq) solution? A) Al B) Ni C) Both Al and Ni would work. D) Neither Al nor Ni would work. E) Cannot be determined. Answer: A Answer: A Answer: A Which of the following compounds is expected to have the LOWEST melting

Consider the following data concerning the equation: The average value for the rate constant k (without units) is A)2710 B)2.74 x104 C)137 D)108 E)none of these Answer: A Answer: A Answer: A Using the following electronegativity values: C2.5Cl3.0 H2.1O3.5 select from the following group the molecule that fits the given statement: a)CH3CHO b)CO2 c)CH3Cl d)C2H6 e)none This molecule shows the smallest number of

For a reaction in which A and B react to form C, the following initial rate data were obtained: What is the rate law? A)Rate = k[A][B] B)Rate = k[A]2[B] C)Rate = k[A][B]2 D)Rate = k[A]2[B]2 E)Rate = k[A]3 Answer: C Answer: C Answer: C Select the answer that best describes an aqueous

Using the following bond energies: BondBond Energy (kJ/mol) CC839 CH413 O=O495 C=O799 OH467 estimate the heat of combustion for one mole of acetylene: C2H2(g) + O2(g) --> 2CO2(g) + H2O(g) A)1228 kJ B)1228 kJ C)447 kJ D)+447 kJ E)+365 kJ Answer: B Answer: B Answer: B Using the following electronegativity values: C2.5Cl3.0 H2.1O3.5 select from the following group the molecule that fits the given statement: a)CH3CHO b)CO2 c)CH3Cl d)C2H6 e)none This molecule contains

Given the following information: Br2bond energy = 193 kJ/mol F2bond energy = 154 kJ/mol Br2(g) + F2(g) --> BrF3(g)DH = 384 kJ/mol calculate the Br-F bond energy. A)244 kJ/mol B)237 kJ/mol C)712 kJ/mol D)128 kJ/mol E)none of these Answer: B Answer: B Answer: B Describe the relationship between hexane and 2-methylpentane A) optical isomers B) structural isomers C) geometric isomers D) not isomers but

For the complete combustion of 1.000 mole of methane gas at 298 K and 1 atm pressure, DH = -890.4 kJ/mol. What will be the heat released when 1.85 g of methane is combusted under these conditions? A)-103 kJ B)103 kJ C)-7701 kJ D)7701 kJ E)none of these Answer: B Answer: B Answer: B Elemental sulfur exists in two

Which 1strow transition metal demonstrates the most oxidation states? A) Fe B) Ti C) Cr D) V E) Mn Answer: E Answer: E Answer: E Select the correct molecular structure for the given species from the choices below: XeF6 A)pyramidal B)tetrahedral C)square planar D)octahedral E)none of these Answer: E Answer: E Answer: E Under certain conditions the reaction H2O2 + 3I- + 2H+ --> I3 - + 2H2O

The questions below refer to the following system: When cobalt(II) chloride is added to pure water, the Co2+ions hydrate. The hydrated form then reacts with the Cl-ions to set up the equilibrium shown here. Which statement below describes the change that the system will undergo if water is added? A) More chloride

Which of the following 0.01 M solutions has the highest pH? A) HOAc B) NaOAc C) Na2CO3 D) H2CO3 E) NaHCO3 Answer: C Answer: C Answer: C The oxidation of Cr3+ to CrO4 2- can be accomplished using Ce4+ in a buffered solution. The following data were obtained: Determine the order in the rate law of the

Consider the molecule: Specify the hybridization of each carbon atom. C-1C-2C-3C-4C-5 A)sp2sp2sp2sp3sp B)sp2sp2sp2sp3sp3 C)sp2sp2sp3sp3sp2 D)sp2sp2sp3sp3sp3 E)sp2sp sp sp2sp Answer: A Answer: A Answer: A How many of the following apply to fibrous proteins? A) 1 B) 2 C) 3 D) 4 E) 5 Answer: B Answer: B Answer: B In which direction do electrons flow in the external circuit? A) left to right B) right to left C) no current

Which represents the ground state for N? A)option a B)option b C)option c D)option d E)option e Answer: A Answer: A Answer: A Choose the member of each set that best matches the label. More metallicBe or Ba More covalentN2O(g), MgO(s) Highest electronegativityO, S, Br A)Be, N2O, O B)Ba, MgO, Br C)Ba, N2O, S D)Be, MgO, O E)Ba, N2O, O Answer: E Answer: E Answer: E Which of the following contains

Consider the compound crotonaldehyde, whose skeleton is: How many nonbonding electrons appear in the Lewis structure of this molecule? A)2 B)4 C)6 D)8 E)10 Answer: B Answer: B Answer: B Determine the units of k for the reaction: C2H4Br2+ 3KI --> C2H4+ 2KBr +KI3, given the initial rate data below? A)mol/L B)mol/Ls C)1/s D)L/mols E)L2/mol2s Answer: D Answer: D Answer: D Solid KF has a lattice

Phosphorus, P4, can be prepared from calcium phosphate by the reaction The molar mass for each reactant is shown below the reactant, and the mass of each reactant for this problem is given above. Which reactant is the limiting reagent? A)C B)SiO2 C)Ca3(PO4)2 D)P4 E)More information is needed. Answer: B Answer: B Answer: B What is the

The mass of 1.12 liters of gas Y at STP is found to be 6.23 g. The molar mass of gas Y is A)56.0 g/mol B)89.0 g/mol C)125 g/mol D) g/mol E)157 g/mol Answer: C Answer: C Answer: C Consider the freezing of liquid water at -10C. For this process what are the signs for DH, DS, and DG? A)

Select the correct molecular structure for the given species from the choices below: PF6 A)pyramidal B)tetrahedral C)square planar D)octahedral E)none of these Answer: DAnswer: Answer: DAnswer: Answer: D Answer: Of the following, which form compounds? A) I, II B) II, III C) I, II, III D) II, III, IV E) III, IV Answer: D Answer: D Answer: D Consider the set of isoelectronic atoms and ions

How many places on the ligand EDTA can simultaneously bind to a single metal atom? A) 1 B) 2 C) 3 D) 4 E) 6 Answer: E Answer: E Answer: E Which Group 3A element has the most stable +1 oxidation state? A) B B) Al C) Ga D) In E) Tl Answer: E Answer: E Answer: E The reduction potential to the metal of Ba2+is -1.57 V

You discover that the complex decomposes in water. You dissolve 0.1000 g of the complex in H2O and add excess NaHg(SCN)4, which precipitates Co(II) as CoHg(SCN)4(s). After the precipitate is washed and dried, its mass is 0.1102 g. How many grams of cobalt are contained in 0.1000 g of the

Which of the following nuclides would be most expected to undergo a-decay? A) 86As B) 127I C) 252Es D) 9C E) 171Ir Answer: C Answer: C Answer: C In the reaction: CaO(s) + SO2(g) --> CaSO3(s) A) Ca2+acts as a Lewis acid and SO3 2-acts as a Lewis base. B) O2-acts as a Lewis base and SO2acts