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Question 1To a graduated cylinder containing 10.56 mL of water was added an obj






Question 1To a graduated cylinder containing 10.56 mL of water was added an object with a mass of 1.4436 grams. The final volume reading on the graduated cylinder was 12.13 mL. What is the density of the object?a) 0.92 g/mLb) Not enough informationc) 0.79 g/mLd) 1.08 g/mLe) None of the aboveQuestion 2Seawater is an example ofa) a compoundb) a homogeneous mixturec) an elementd) a heterogeneous mixtureFlag this QuestionQuestion 31 ptsOf the following substances, only ______ has London dispersion forces as its only intermolecular forcea) NH3b) CH4c) CH3OHd) Hale) H2SFlag this QuestionQuestion 41 ptsWhen the following equation is balanced using the smallest possible integers, what is the number in front of the underlined substance?PCl5 + H2O → H3PO4 + HCla) 11b) 5c) 1d) 2e) 3Flag this QuestionQuestion 51 ptsHow many grams of O2 are needed to produce 624.4 g of Fe2O3?4Fe + 3O2  → 2Fe2O3a) 250.2 gb) 187.7 gc) 125.1 gd) 3.910 ge) 375.4 gFlag this QuestionQuestion 61 ptsWhite phosphorous, P4, is prepared by fusing calcium phosphate, Ca3 (PO4)2, with carbon and sand, SiO2, in an electric furnace.2Ca3(PO4)2 (s) + 6 SiO2 (s) + 10 C (s) → P4 + 6 CaSiO3 (s) + 10 COHow many moles of CaSiO3 are produced if 4.4 moles of calcium phosphate react?a) 8.80 molb) 22.0 molc) 2.2 mold) 13.2 mole) 26.4 molFlag this QuestionQuestion 71 ptsCalculate the percent (by mass) of phosphorous in NaH2PO4.a) 53.3%b) 19.2%c) 25.8%d) 12.5%Flag this QuestionQuestion 81 ptsThe reaction, Al2(SO4)3 (aq) + 6 NaOH (aq) → 2 Al (OH)3 (s) + 3 Na2SO4 (aq) is a(n) ______ reaction.a) single replacementb) acid-basec) precipitationd) oxidation-reductionFlag this QuestionQuestion 91 ptsThe correct formula for magnesium nitrite isa) Mg2NO2b) Mg(NO3)2c) MgNO3d) Mg(NO2)2e) Mg2NO3Flag this QuestionQuestion 101 pts(Limiting reactant problem) Reacting 1.23 moles of NaOH and 1.47 mol of Cl2, how many moles of NaClO could be obtained according to the following balanced equation?2NaOH + Cl2 → NaCl + NaClO + H2Oa) 1.47 molb) 1.23 molc) 0.615 mold) 0.735 mole) 2.46 molFlag this QuestionQuestion 111 ptsHow many neutrons are there in an atom of 48Ti?a) 26b) 47c) 69d) 22Flag this QuestionQuestion 121 ptsHow many total electrons are present in a bromine, Br, atom?a) 35b) 40c) 34d) 37e) 36Flag this QuestionQuestion 131 ptsWhat is the electron configuration for the phosphorus atom?a) 1s22s22p63s5b) 1s22s22p63s23p5c) 1s22s22p63s23p3d) 1s22s22p63s23p2Flag this QuestionQuestion 141 ptsWhich of the following does not have 8 valence electrons?a) Arb) Krc) Cld) NeFlag this QuestionQuestion 151 ptsWhich of the following atoms has the smallest atomic radius?a) Brb) Clc) Fd) Gee) NeFlag this QuestionQuestion 161 ptsMetal atoms tend to ______________ electrons and form ______________ ions.a) gain; negativeb) share; neutralc) lose; positived) gain; positivee) lose; negativeFlag this QuestionQuestion 171 ptsChemical bonds formed by the sharing of electrons are calleda) magnetic bondsb) covalent bondsc) coordinate bondsd) ionic bondsFlag this QuestionQuestion 181 ptsWhat is the correct formula for the product of the reaction Al + O2?a) AlO3b) Al3O2c) AlO2d) Al2O3e) AlOFlag this QuestionQuestion 191 ptsWhich element or ion has the electronic configuration, 1s22s22p63s23p63d104s24p5?a) Br -b) Brc) None of thesed) Rb+e) KrFlag this QuestionQuestion 201 ptsEqual masses of hydrogen gas and oxygen gas are reacted to form water. Which substance is in excess?a) Oxygen gas (O2) is in excess.b) Neither gas is in excess.c) Hydrogen gas (H2) is in excess.Flag this QuestionQuestion 211 ptsWhich of the following compounds contains one or more covalent bonds?a) SrF2b) K2Sc) RaCl2d) NH3e) CsBrFlag this QuestionQuestion 221 ptsWhen the equation Al4C3(s) + H2O(l) → CH4(g) + Al(OH)3 (s) is balanced, what is the coefficient for Al(OH)3?a) 1b) 5c) 3d) 2e) 4Flag this QuestionQuestion 231 ptsThe correct name for an aqueous solution of H2SO3a) dihydrogen sulfurous acidb) sulfuric acidc) sulfurous acidd) sulfite acide) sulfate acidFlag this QuestionQuestion 241 ptsAn aqueous solution of potassium sulfate is allowed to react with an aqueous solution of lead(II) nitrate. The net ionic equation would contain which of the following species?a) 2K+(aq)b) Pb2+(aq)c) 2NO3-(aq)d) NO3-(aq)e) 2SO42-(aq)Flag this QuestionQuestion 251 ptsWhat is the molecular formula for C2H4 molar mass = 88 g/mol?a) C4H8O4b) C4H8O2c) C2H4Od) C2H4O2Flag this QuestionQuestion 261 ptsHow many moles of sodium hydroxide are in 0.75 L of a 2.5 M solution of NaOH? (A 2.5 M solution contains 2.5 moles of solute in each liter of solution).a) 1.9 molb) 3.3 molc) 0.75 mold) 2.5 molFlag this QuestionQuestion 271 ptsThe amount of a substance that dissolved in a given quantity of water at a given temperature to give a saturated solution is itsa) solubilityb) supersaturated solutionc) saturated solutiond) unsaturated solutionFlag this QuestionQuestion 281 ptsAn aqueous solution is made from 0.798 g of potassium permanganate, KMnO4. If the volume of a solution is 50.0 mL, what is the molarity of KMnO4 in the solution? (Remember: M stands for molar.)a) 9.90 Mb) 0.05 Mc) 16.0 Md) 0.101 Me) 5.05 x 10-3 MFlag this QuestionQuestion 291 ptsHow many protons are in the nucleus of a Ca atom?a) 20b) 39c) 40d) Variablee) 41Flag this QuestionQuestion 301 ptsClassify the following reaction:BaCl2 (aq) + CuSO4 (aq) → BaSO4 (s) +CuCl2 (aq)a) Acid-baseb) Single displacementc) Double replacementd) Combination or synthesise) PrecipitationFlag this QuestionQuestion 311 ptsHow many atoms of magnesium are present in 28.5 g of magnesium?a) 7.061 x 1023b) 6.022 x 1023c) 2.050 x 10-24d) 1.720 x 1025Flag this QuestionQuestion 321 ptsWhen an electron in the excited state emits energy in the form of light it is said to go to the ____ state.a) Groundb) Ionicc) Stabled) Excitede) AcidicFlag this QuestionQuestion 331 ptsThe compound CrSO4 is nameda) Chromium sulfiteb) Chromium sulfatec) Chromium (II) sulfited) Chromium (II) sulfate