chem final

Diamond is one form of elemental carbon. An engagement ring contains a diamond weighing 1.25 carats (1 carat = 200 mg). How many atoms are present in the diamond?a.) 1.25 × 10^22 b.) 1.25 × 10^20 c.) 0.250chapter 3Based on the following electron configuration, [Xe]6s2, this element would most likelya.) loss 2 electrons to form a +2 cation and could form an ionic bond with a metal b.) gain 2 electrons to form a +2 cation and could form an ionic bond with a non-metal c.) loss 2 electrons to form a +2 cation and could form an ionic bond with a non-metalWhat is the ground-state electron configuration of a Zn2+ ion?a.) [Ar] 4s^2 3d^9 b.)[Ar] 3d^10 c.)[Ar] 4s^1 3d^9What is the ground-state electron configuration of Mg2+ ?a.) [Ne] b.) [Ne]3s^23p^1 c.) [He]Which of the following sets of quantum numbers (n, l, ml, ms) may describe an electron in a 3d orbital?a.) 3; 2; 0; -1/2 b.) 3; 2; 3; -1/2 c.) 4; 1; 2; 1/2Which of the following correctly describes the Bohr model of atom?A. Electrons are embedded in a positively charged substrate B. Electrons orbit nucleus in orbits that have set sizes and quantized energies. C. All matter is composed of very small indivisible particles, called atoms.Which one of these compounds is an ionic compound?a) C6H12O6 b) NO2 c) Li2OChapter 4Select the correct name—formula pair.a) carbon tetrachlorine; CCl4 b) trisilicon octabromide; Si3Br8 c) oxygen difluorine; OF2Among the molecules CH4, NH3, SiF4, SO3, and BF3, select all that are nonpolar.a) CH4, SiF4, SO3, and BF3 b) CH4, NH3, SiF4, and BF3 c) CH4, SO3, NH3,and BF3Which of the following naming is incorrect?a.) FeSO4 iron(III) sulfate b.) Fe2(SO3)3 iron(III) sulfite c.) Fe2(SO4)3 iron(III) sulfateList the following bonds in order of decreasing polarity : P-H, S-H, Cl-H.a) P-H, S-H, Cl-H b) P-H, Cl-H, S-H c) Cl-H, S-H, P-HWhat are the molecular shape and bond angles in PF3?a) trigonal pyramidal, 110° b) octahedral, 90° c) octahedral, 90°chapter 5What is the hybridization of the central atom in BeH2 ?a) sp b) sp3d2 c) sp3What is the hybridization of the central atom in SF6 ?a) sp^3d^2 b) sp^2 c) sp^3dWhat is the hybridization of the central atom in PO4^3- ?a) sp^3d b) sp^3 c) sp^2What is the hybridization of the central atom in XeF4 ?a) sp^3d^2 b) sp^3 c) sp^3dWhat is the hybridization of the central atom in PCl5 ?a) sp^2 b) sp^3d c) spPredict the molecular geometry of SO3 molecule by VSEPR.a) trigonal planar b) bent c) tetrahedralchapter 6A compound of carbon and hydrogen contains 84.1% C and 15.9% Hand has a molar mass of 114.2 g/mol. What is its molecular formula?a) CH4 b) C8H18 c) C6H6An unknown hydrocarbon compound was analyzed for hydrogen by elemental analysis and results show that it contains 15.88 % H. What is the empirical formula?a) C4H9 b) C8H18 c) C12H27Calculate the mass percent of nitrogen, N% , of ammonium carbonate, (NH4)2CO3a) 29.16% b) 12.50% c) 49.95%If 1.600 moles of a solute are dissolved in enough water to make 400.0 mL of solution, what is the molarity?a) 4.000 b) 0.2500 c) 0.004000How many moles of iron(II) sulfate are contained in 4 .657 g FeSO4 ?a) 0.03066 b) 0.4657 c) 1.245Chapter 7Which of the following is a precipitation reaction?a) NaI(aq) + AgNO3(aq) → AgI(s) + NaNO3(aq) b) HBr(aq) + LiOH(aq) → LiBr(aq) + H2O(l) c) 2.1 gc) 2.1 g O3 O3What is the net ionic equation for the following molecular equation?BaCl2(aq) + Na2SO4(aq) → BaSO4(s)+ 2NaCl(aq)a) Ba2+(aq) + SO42—(aq) → BaSO4(s) b) BaCl2(aq) + Na2SO4(aq) → BaSO4(s)+ 2NaCl(aq) c) Ba2+(aq) + 2Cl—(aq) + 2Na+(aq) + SO42—(aq) → Ba2+(aq) + 2Cl—(aq) + 2Na+(aq) + SO42—(aq)Considering the limiting reactant concept, calculate the number of moles of CO2 produced from 2.80 moles of O2 and 0.700 moles of C2H6 by the following reaction. 2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(g)a) 1.40 b) 2.50 c) 1.50Consider the following balanced reaction: 2Fe(s) + 3 Cl2(g) → 2FeCl3(s)Starting with 10.0g of Cl2 and excess Fe, determine the theoretical yield of FeCl3 (MM FeCl3= 162.2 g/mol)a) 15.3 g b) 47.7 g c) 12.0 gWhich of the following is a precipitation reaction?a) 2NaOH(aq) + MgCl2(aq) → 2 NaCl(aq) + Mg(OH)2(s b) H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + 2H2O(l) c) Ca(s) + 2HCl(aq) → CaCl2(aq) + H2(g)Which is the correct coefficient for O2 in the following equation after balancing?__C5H10 + __O2 → __CO2 + __H2Oa) 15 b) 4 c) 7Chapter 8Calculate the final volume of SO3 gas if it occupies 10.0 L at 5.0 °C, and is heated to 75.0 °C at the same pressure.a) 12.5 L b) 7.99L c) 2.05 LConsider the following reaction: 2C2H6(g) + 7O2(g) → 4CO2(g) + 6 H2O(g) Calculate the volume of CO2 produced when 25.0 L of C2H6 completely reacts with excess O2 at STP.a) 25.0 L b) 50.0 L c) 5.00 LGases have no definite shape, instead, assume the shape of container.a) Gases won't mix uniformly. b) Gas particles are in constant, rapid motion. c) Gases have no definite shape, instead, assume the shape of container.What pressure is exerted on a 20.0L container with 15.9 g of SO2(s) at a temperature of 25.0 °C ?a) 0.303 atm b) 6.07 atm c) 0.28 atmChapter 9a) b) c)A reaction where the products are higher in energy than the reactants is an example of an _____.a) endothermic process b) exothermic process c) exergonic processUsing the data provided below, calculate the standard enthalpy change for the following reaction:a) -164.2 kJ b) 164.2 kJ c) 135.5 kJHow much heat is produced by combustion of 125 g of methanol under standard state conditions? CH3OH + 3/2 O2 → CO2 + 2H2O ∆Hc = -726.1 kJa) 2833 kJ b) 1089 kJ c) 1452 kJChapter 10a) b) c)a) b) c)Which of the following halogens would have stronger intermolecular forces?a) Cl2 b) Br2 c) I2Which of the following molecules would have the weakest intermolecular forces?a) F2 b) H2O c) NH3Which region of the heating curve as shown below represents ∆Hfusion ?a) b) c)Which region of the following phase diagram represents solid? Which curve represents the vaporization-condensation process?CB

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