Q&A Hero

Q: When the equation__ C5H6N2OS(s) + __ O2(g)→ __ CO2(g) + __ H2O(l) + __ N2(g) + __ SO2(g)is balanced, the sum of all the coefficients (simplest whole number) isA) 19.B) 20.C) 24.D) 18.E) 21.

Q: When the equation__ (CH3)2NNH2+ __ N2O4 → __ N2+ __ H2O + __ CO2is balanced, the sum of all the coefficients (simplest whole number) isA) 13.B) 12.C) 9.D) 10.E) 11.

Q: A reaction occurs between sodium carbonate and hydrochloric acid, producing sodium chloride, carbon dioxide, and water. Which is the correct set of coefficients, respectively, for the balanced reaction? A) 3 6 6 3 4 B) 8 6 5 10 5 C) 5 10 10 5 5 D) 1 2 2 1 1 E) none of these

Q: The complete combustion of pentane yields carbon dioxide and water. When the equation__ C5H12(l) + __ O2(g) → __ CO2(g) + __ H2O(l)is balanced, the ratio of the coefficient of CO2to the coefficient of O2isA) 8:5.B) 8:6.C) 6:5.D) 5:6.E) 5:8.

Q: The complete combustion of phenylhydrazine, C6H5NHNH2, with the oxidizer dinitrogen tetraoxide is shown in the following equation:__ C6H5NHNH2+ __ N2O4 → __ CO2+ __ H2O + __ N2When this equation is balanced, the sum of all the coefficients (using smallest whole numbers) isA) 30.B) 20.C) 25.D) 10.E) 15.

Q: All the following may change during a chemical reaction except A) the total volume of the system. B) the density of the system. C) the temperature of the system. D) the total number of atoms in the system. E) the total number of molecules in the system.

Q: Treatment of sodium borohydride with sulfuric acid is a convenient method for the preparation of diborane:__ NaBH4+ __ H2SO4 → __ B2H6+ __ H2 +__Na2SO4When the equation is balanced, the lowest whole number coefficient for hydrogen isA) 5.B) 2.C) 4.D) 1.E) 3.

Q: Energy from the following reaction provided the lift for the moon lander:__ (CH3)2N2H2+ __ N2O4 →__ N2+ __ H2O + __ CO2When the equation is balanced, the smallest whole-number coefficient of nitrogen isA) 5.B) 4.C) 1.D) 3.E) 2.

Q: The products of the combustion of acetaldehyde with oxygen are shown in the following equation:__ CH3CHO + __ O2 → __ CO2+ __ H2OWhen properly balanced, the equation indicates that ____ molecules of O2 are required to burn 2 molecules of CH3CHO.A) 2B) 6C) 4D) 3E) 5

Q: The complete combustion of butane, C4H10, yields carbon dioxide and water: The smallest whole-number coefficient of oxygen in the balanced equation is A) 12. B) 14. C) 10. D) 11. E) 13.

Q: The complete combustion of propane, C3H8, yields carbon dioxide and water: The smallest whole-number coefficient of oxygen in the balanced equation is A) 6. B) 3. C) 7. D) 4. E) 5.

Q: When the following equation is balanced with lowest whole-number coefficients, what is the coefficient for NO(g)?___NH3(g) + ___O2(g) → ___NO(g) + ___H2O(g)A) 3B) 2C) 5D) 4E) 1

Q: How many of the following statements are true concerning chemical equations? I. Coefficients can be fractions. II. Subscripts can be fractions. III. Coefficients represent the relative masses of the reactants and/or products. IV. Changing the subscripts to balance an equation can be done only once. V. Atoms are conserved when balancing chemical equations. A) 3 B) 4 C) 2 D) 5 E) 1

Q: Sulfuric acid reacts with aqueous sodium hydroxide to produce aqueous sodium sulfate and liquid water. Which is the correct balanced chemical equation for this reaction description?A) H2SO4(aq) + 2NaOH(aq) →Na2S(aq) + 2H2O(l) + 2O2(g)B) H2S(aq) + 2NaOH(aq) →Na2S(aq) + 2H2O(l)C) H2SO4(aq) + NaOH(aq) → NaSO4(aq) + H2O(g)D) H2SO4(aq) + 2NaOH(aq) → Na2SO4(aq) + 2H2O(l)E) H2SO4(aq) + (NaOH)2(aq) → Na2SO4(aq) + 2H2O(l)

Q: Which is a correct balanced chemical equation corresponding to the following description of a chemical reaction?Hydrochloric acid reacts with magnesium metal to produce aqueous magnesium chloride and hydrogen gas.A) 2HCl(aq) + Mg(s) → MgCl2(aq) + 2H(g)B) 2HCl(aq) + Mg(s) → MgCl2(aq) + H2(g)C) 2HCl(aq) + Mg(s) → MgCl(aq) + H2(g)D) 2HCl(aq) + Mg(aq) → MgCl2(s) + H2(g)E) HCl(aq) + Mg(s) → MgCl(aq) + H(g)

Q: In the following chemical equation, what is the reactant?CuSO45H2O(s) → CuO(s) + SO3(g) + 5H2O(l)A) CuSO45H2O(s)B) H2O(l)C) CuO(s)D) SO3(g)E) CuSO4(s)

Q: What is the balanced chemical equation that represents the following reaction?A) 6H + 2N → 2NH3B) 6H + 2N → 2HN3C) 2N + 2H3→2H3ND) 6H + 2N → 2N3HE) 3H2+ N2 →2NH3

Q: For the following balanced chemical equation, which substance represents the catalyst?2CO(g) + 2NO(g) 2CO2(g) + N2(g)A) NO(g)B) CO(g)C) CO2(g)D) N2(g)E) Rh(s)

Q: The oxoanion that comes from nitrous acid isA) N2O3-.B) NO2-.C) HNO3-.D) NO-.E) NO3-.

Q: Which name"formula pair is incorrect? A) hypochlorous acid, HClO2 B) titanium(IV) carbide, TiC C) strontium nitride, Sr3N2 D) magnesium sulfate heptahydrate, MgSO47H2O E) dinitrogen tetroxide, N2O4

Q: Which name"formula pair is incorrect? A) HI, hydroiodic acid B) H2SO3, sulfurous acid C) H2SO4, sulfuric acid D) HClO4, perchloric acid E) HNO3, carbonic acid

Q: The formula for chloric acid is A) HClO2. B) HClO. C) HCl. D) HClO4. E) HClO3.

Q: The chemical name for the binary, non-ionic molecule with the formula PBr5is A) phosphorus pentabromide. B) monophosphorus bromide. C) phosphide pentabromide. D) phosphorus pentabromine. E) monophosphorus pentabromine.

Q: The chemical name for the model is A) dinitrogen tetroxide. B) nitrogen tetroxide. C) nitrogen oxide. D) nitric oxide. E) nitrogen trioxide

Q: The correct name for LiCl is A) monolithium chloride. B) lithium chloride. C) lithium(I) chloride. D) monolithium monochloride. E) lithium monochloride.

Q: What is the formula for the nitride of samarium(III)? A) SmN B) Sm2N3 C) Sm(NO3)2 D) Sm(NO3)3 E) Sm(NO2)3

Q: What is the formula for the chlorate of gadolinium(III)? A) Gd(ClO4)2 B) GdCl2 C) Gd2(ClO3)3 D) GdCl3 E) Gd(ClO3)3

Q: What is the formula for sodium peroxide? A) Na3O2 B) NaO C) Na2O D) NaO2 E) Na2O2

Q: What is the subscript of potassium in the formula for potassium sulfate? A) 2 B) 5 C) 3 D) 4 E) 1

Q: The formula for magnesium nitride is A) Mg2N3. B) Mg3N2. C) MgNO2. D) Mg(NO2)2. E) MgN.

Q: The formula for potassium carbonate is A) P2C. B) K2CO3. C) Po2CO3. D) P2CO3. E) K2C.

Q: The formula for aluminum fluoride is A) AlF3. B) AlF. C) Al2F. D) AlF4. E) AlF2.

Q: Choose the name"formula pair that does not match.A) calcium hydride, CaH2B) ammonium hydrogen carbonate, NH4CO3C) sodium chlorite, NaClO2D) calcium hydroxide, Ca(OH)2E) nitric acid, HNO3

Q: Choose the name"formula pair that does not match.A) calcium fluoride, CaF2B) iron(III) oxide, Fe2O3C) aluminum oxide, Al2O3D) potassium permanganate, K2MnO4E) sodium sulfite, Na2SO3

Q: The formula for copper(II) phosphate is A) Co3(PO4)2. B) CuPO4. C) Co2(PO4)3. D) Cu2(PO4)3. E) Cu3(PO4)2.

Q: The formula for aluminum sulfate is A) Al2(SO3)3. B) Al2S3. C) Al2(SO4)3. D) Al3S2. E) Al3(SO4)2.

Q: The chemical formula for iron(III) sulfide is A) Fe3(SO4)2. B) Fe2S3. C) Fe3(SO3)2. D) Fe2(SO3)3. E) Fe2(SO4)3.

Q: The formula for aluminum bromide is A) AlB. B) AlBr. C) Al2Br3. D) AlBr2. E) AlBr3.

Q: What is the formula of magnesium nitrite? A) Mg(NO2)2 B) Mg3N2 C) Mg2(NO2)2 D) Mg2N3 E) Mg(NO2)3

Q: The formula of magnesium sulfide is A) MgS. B) MgSO2. C) MgSO4. D) MgSO3. E) Mg(SO4)2.

Q: What is the formula for calcium nitride? A) CaNO2 B) Ca(NO3)2 C) Ca(NO2)2 D) Ca3N2 E) Ca2N3

Q: What is the correct name for Sc2O3? A) manganese(III) oxide B) manganese oxide C) dimanganese trioxide D) manganese trioxide E) dimanganese(II) oxide

Q: What is the correct formula for bismuth(III) sulfite? A) BiSO3 B) Bi2SO3 C) Bi3(SO3)2 D) Bi2(SO3)3 E) Bi(SO3)2

Q: What is the formula for the chloride of praseodymium(III)? A) Pr2(ClO2)3 B) Pr(ClO4)2 C) Pr3Cl D) PrCl3 E) Pr(ClO3)3

Q: The correct name for FeO is A) iron(I) oxide. B) iron oxide. C) iron monoxide. D) iron(II) oxide. E) iron(III) oxide.

Q: What is the name of the compound whose formula is Al2(SO4)3? A) aluminum sulfate B) dialuminum tri(sulfur tetraoxygen) C) aluminum sulfide D) aluminum persulfate E) aluminum sulfite

Q: The systematic name for BaH2is A) barium(II) hydrate. B) barium hydride. C) barium dihydrate. D) barium dihydrogen. E) barium dihydride.

Q: The formulas of the carbonate ion, the ammonium ion, and the chlorate ion are represented, respectively, asA) CO32-, NH2-, ClO3-.B) CO32-, NH4+, ClO3-C) CO2-, NH4+, ClO-.D) P3-, NH3+, ClO2-.E) CO32-, NH3+, ClO2-.

Q: All the following ions have the same charge except A) oxide. B) monohydrogen phosphate. C) peroxide. D) permanganate. E) oxalate.

Q: All the following ions have the same charge except A) sulfate. B) dichromate. C) chlorate. D) sulfide. E) sulfite.

Q: The formulas of the hydroxide ion, the nitrate ion, and the phosphate ion are represented, respectively, asA) OH-, NO2-, PO33-.B) OH-, NO2-, PO43-.C) H-, NO2-, P3-.D) H-, NO3-, P3-.E) OH-, NO3-, PO43-.

Q: The formulas of the nitrite, phosphate, and nitrate ions are represented, respectively, asA) N3-, PO33-, NO3-.B) NO-, P5-, NO3-.C) NO2-, P3-, NO3-.D) NO3-, PO2-, N3-.E) NO2-, PO43-, NO3-.

Q: The name of the SO42-ion isA) persulfate.B) thiosulfite.C) sulfite.D) sulfate.E) sulfide.

Q: The formula of the perchlorate ion isA) Cl2O3-.B) ClO2-.C) CN-.D) ClO4-.E) ClO-.

Q: The correct name for Sn2+is A) monotin ion. B) tin(II) ion. C) tin ion. D) tin(I) ion. E) tin.

Q: The formula for the sulfide ion isA) SO42-.B) SO32-.C) S2O32-.D) S2-.E) HSO4-.

Q: Which of the following represents a known ion?A) S2+B) Sc4+C) Sn2+D) P4-E) Na-

Q: Which metals form cations with varying positive charges? A) many transition metals B) Zn and Al C) Group 1 metals D) Group 1 and Group 2 metals E) Group 2 metals

Q: How many electrons does a chloride ion have? A) 17 B) 22 C) 15 D) 18 E) 2

Q: As an ion, sodium has ______ electrons? A) 24 B) 14 C) 11 D) 28 E) 10

Q: Which of the following statements is false?A) A crystal of calcium fluoride has equal numbers of calcium ions and fluoride ions.B) A sodium atom is most likely to ionize to form a cation of charge +1.C) A sulfide ion has a total of 18 e-.D) A potassium ion has a total of 18 e-.E) The charge on a neutral chlorine atom is zero.

Q: How many electrons does a barium ion have? A) 56 B) 8 C) 54 D) 38 E) 2

Q: Which of the following molecules contains the alcohol functional group? A) C6H6 B) CH3OH C) CH4 D) CH3OCH3 E) C2H2

Q: Which of the following molecules contains the carboxylic acid functional group? A) CH3CH2CH2OH B) CH3CH2COCH2CH3 C) CH3NHCH3 D) CH3OCH2CH3 E) CH3CH2CH2COOH

Q: Which of the following molecules contains the ether functional group? A) CH3CH2NH2 B) CH3CH2OCH2CH3 C) CH3CH2OH D) CH3CH2COOH E) H2O

Q: Which of the following molecules is a hydrocarbon? A) H2O B) CH3CH2CH3 C) C6H12O6 D) CH3CH2OH E) CH3OCH3

Q: The empirical formula of a salt consisting of Sr2+and NO2-ions isA) Sr2+NO2-.B) SrNO2.C) Sr2NO2.D) Sr2(NO2)3.E) Sr(NO2)2.

Q: Which statement is incorrect concerning the formation of ionic compounds?A) Halogens tend to form anions with a charge of -1.B) Alkali metals tend to form cations with a charge of +1.C) Metals tend to form cations, while nonmetals tend to form anions.D) Transition metals tend to form cations with a charge of +3.E) Noble gases tend not to form ionic compounds.

Q: What is the ratio of oxygen atoms to hydrogen atoms in the mineral carnotite, K2(UO2)3(VO4)2 - 3H2O?A) 8:6B) 8:3C) 17:3D) 9:6E) 17:6

Q: What is the ratio of oxygen atoms to hydrogen atoms in the compound Fe4(PO4)3(OH)3-12H2O?A) 15:3B) 27:15C) 27:27D) 18:27E) 25:17

Q: How many oxygen atoms are there in a formula unit of UO2(C2H3O2)2 NH4C2H3O2 - 4H2O?A) 4B) 12C) 21D) 8E) 10

Q: The formula of water, H2O, suggests A) there is twice as much mass of hydrogen as oxygen in each molecule. B) there are two oxygen atoms and one hydrogen atom per water molecule. C) there is twice as much mass of oxygen as of hydrogen in each molecule. D) there are two hydrogen atoms and one oxygen atom per water molecule. E) none of these

Q: Which of the following is an ionic compound? A) HOClO B) NH3 C) CH3OH D) N2O3 E) NH4CN

Q: Chemical reactions between nonmetals and nonmetals primarily involve A) sharing of electrons. B) interactions between protons. C) transfer of electrons. D) interactions among protons, electrons, and neutrons. E) interactions between protons and electrons.

Q: Aluminum(III) sulfite is an ionic compound formed from Al3+ and SO32-. What is the correct way to represent the formula? A) AlSO3+ B) Al(SO3)2- C) Al3+SO32- D) Al2(SO3)3 E) Al7(SO3)10.5

Q: Which of the following statements is true about one formula unit of SrBr2?A) It is composed of one Sr atom and one Br2 molecule.B) It is composed of one Sr atom and two Br atoms.C) It is composed of one Sr2+ion and one Br22-ion.D) It is composed of one SrBr2molecule.E) It is composed of one Sr2+ion and two Br"ions.

Q: The species that is formed when a molecule gains or loses an electron is called A) an ion. B) a metalloid. C) an isotope. D) an atom. E) a metal.

Q: The species Au+, Mg2+, and V3+are all A) anions. B) isotopes. C) isoelectronic. D) allotropes. E) cations.

Q: An ion is formed A) by either adding electrons to or subtracting electrons from the atom. B) by either adding protons to or subtracting protons from the atom. C) by either adding neutrons to or subtracting neutrons from the atom. D) All of the above are true. E) Two of the above are true.

Q: A sample of the mineral troegerite, (UO2)3(AsO4)2 - 12H2O, has 1.33 x 1021U atoms. How many arsenic atoms are present in this sample of troegerite?A) 2.00 x 1022B) 1.60 x 1022C) 2.66 x 1021D) 6.65 x 1022E) 8.87 x 1020