Q&A Hero

Q: Which of the following elements is an inner transition metal? A) Eu B) Fe C) Ru D) Sc

Q: Which is a third transition series element? A) Al B) Mg C) Pr D) Pt

Q: In which blocks of the periodic table are the transition series and inner transition series elements found? A) d, p B) d,f C) s, d D) s, p

Q: The number of transition series is A) one B) two C) four D) seven

Q: Which of these molecules is most likely to contain good overlap of p orbitals, as shown in figure (a), rather than poor overlap of p orbitals, as shown in figure (b)?A) Cl2B) N2C) P4D) S8

Q: Which of these molecules is most likely to contain good overlap of p orbitals, as shown in figure (a), rather than poor π overlap of p orbitals, as shown in figure (b)?A) Cl2B) O2C) P4D) S8

Q: Which of the elements indicated on the above periodic table is a group 4A element that forms the strongest bonds?A) element AB) element BC) element CD) element D

Q: Which of the elements indicated on the above periodic table is a group 4A element that is a semiconductor? A) element A B) element B C) element C D) element D

Q: Which of the elements indicated on the above periodic table is the group 7A element with the largest atomic radius? A) element A B) element B C) element C D) element D

Q: Which of the elements indicated on the above periodic table is the group 5A element with the smallest atomic radius? A) element A B) element B C) element C D) element D

Q: Which of the elements indicated on the above periodic table is least electronegative? A) element A B) element B C) element C D) element D

Q: Which of the elements indicated on the above periodic table has the highest ionization energy? A) element A B) element B C) element C D) element D

Q: The elements indicated by the shaded area in the following periodic table are all A) main-group elements. B) main-group metals. C) nonmetals. D) semimetals.

Q: The elements indicated by the shaded area in the following periodic table are all A) main-group metals. B) nonmetals. C) p-block elements. D) semimetals.

Q: The elements indicated by the shaded area in the following periodic table are all A) main-group elements. B) p-block elements. C) s-block elements. D) transition elements.

Q: The elements indicated by the shaded area in the following periodic table are all A) metals. B) nonmetals. C) p-block elements. D) s-block elements.

Q: The elements indicated by the shaded area in the following periodic table are all A) metals. B) nonmetals. C) p-block elements. D) s-block elements.

Q: The elements indicated by the shaded area in the following periodic table are all A) gases. B) metals. C) nonmetals. D) semimetals.

Q: How would one synthesize a perchlorate salt? A) Electrolytic oxidation of a solution of chorate salt. B) Electrolytic oxidation of a solution of chorite salt. C) Electrolytic oxidation of a solution of hypochlorite salt. D) Oxidation of a solution of chlorate salt by a perbromate salt.

Q: What are the products of the reaction of chlorine gas with hot aqueous sodium hydroxide? A) Cl- and H2O B) ClO3- and H2O C) Cl- and ClO3- D) Cl-, ClO3- and H2O

Q: Given that hypohalous acids form by the following reactionX2(aq) + H2O(l) HOX(aq) + H+(aq) + X-(aq)which of the following changes will increase the yield of HOX?A) add waterB) add X-C) decrease the pHD) increase the pH

Q: Using principles discussed in chapters 15 and 19, determine which of the following is the strongest acid. A) HClO2 B) HClO3 C) HBrO3 D) HIO3

Q: Using principles discussed in chapters 15 and 19, determine which of the following is the strongest acid. A) HClO B) HClO2 C) HClO3 D) HClO4

Q: A 0.01 M aqueous solution of which of the following is the most basic? A) NaClO B) NaClO2 C) NaClO3 D) NaClO4

Q: Which of the halogens forms more than one perhalic acid? A) F B) Cl C) Br D) I

Q: What is the structure of sulfuric acid? A) 1 B) 2 C) 3 D) 4

Q: What is the name of the commercial process for the preparation of sulfuric acid? A) Contact process B) Haber process C) Mond process D) Ostwald process

Q: What is the anhydride of sulfuric acid? A) SO2 B) SO3 C) S2O3 D) S2O5

Q: What is a convenient synthetic method for the preparation of SO2?A) 2 SO3(g) + heat -> 2 SO2(g) + O2(g)B) S8(s) + 8 O2(g) + heat -> 8 SO2(g)C) H2SO3(aq) H2O(l) + SO2(aq)D) FeSO3(s) + heat -> FeO(s) + SO2(g)

Q: What statement is not representative of the chemistry of H2S? A) It has a linear geometry. B) It is an extremely toxic substance. C) It is a weak diprotic acid. D) It is a weak reducing agent.

Q: The increased viscosity of molten sulfur at 160-195C is due to the A) melting of S8 to give discrete S8 units. B) merging of the S8 rings to give interlocking S8 rings. C) opening of the S8 rings to give smaller S units. D) opening of the S8 rings which then polymerize into long chains.

Q: Describe the color changes when sulfur (melting point 113C, boiling point 445C) is heated from 25C to 500C? It turns from a yellow solid to a A) dark reddish brown liquid and then boils. B) reddish brown solid and then into reddish brown liquid and then boils. C) straw colored liquid which turns dark reddish brown and then it boils. D) yellow liquid and then it boils.

Q: What are appropriate methods for the generation of H2S?Reaction 1: FeS(s) + 2 H+(aq) -> H2S(g) + Fe2+(aq)Reaction 2: CH3C(CS)NH2(aq) + H2O(l) + heat -> CH3(CO)NH2(aq) + H2S(aq)Reaction 3: 3 S(g) + 2 H2O(g) -> SO2(g) + 2 H2S(g)Reaction 4: 2 SO2(g) + 2 H2O(g) -> 2 H2S(g) + 3 O2(g)A) Reactions 1 and 2B) Reactions 1 and 3C) Reactions 2 and 3D) Reactions 2 and 4

Q: What is the structure of rhombic sulfur? A) crown shaped S8 molecules B) discrete S atoms C) discrete S2 molecules D) polymeric Sn chains

Q: What is the chemical formula of "fool's gold"?A) cinnabar, HgSB) galena, PbSC) gypsum, CaSO4 ->2H2OD) pyrite, FeS2

Q: Which elements of group 6A are oxidizing agents and which are reducing agents? A) O and S are oxidizing agents while Se and Te are reducing agents. B) O and Se are oxidizing agents while S and Te are reducing agents. C) O and S are reducing agents while Se and Te are oxidizing agents. D) O and Se are reducing agents while S and Te are reducing agents.

Q: Which element of group 6A has the highest boiling point? A) S B) Se C) Te D) Po

Q: Which element of group 6A has the highest melting point? A) S B) Se C) Te D) Po

Q: What statement is not characteristic about group 6A elements? A) Oxygen, sulfur, and selenium are typical nonmetals while tellurium is a semi-metal. B) Oxygen is a powerful oxidizing agent but H2Se and H2Te are good reducing agents. C) S, Se, and Te are much less electronegative than oxygen and commonly have positive oxidation states. D) The favored oxidation state of Te and Po is +2.

Q: Which group 6A element is naturally radioactive? A) S B) Se C) Te D) Po

Q: Which group 6A element has the most negative electron affinity? A) O B) S C) Se D) Te

Q: What are the molecular structures of orthophosphoric acid and pyrophosphoric acid? A) 1 and 2 B) 1 and 3 C) 2 and 3 D) 3 and 4

Q: What is the molecular structure of phosphorous acid? A) 1 B) 2 C) 3 D) 4

Q: What is the most acidic oxide of phosphorus? A) PO2 B) PO3 C) P4O6 D) P4O10

Q: What is an appropriate method for the synthesis of phosphorus?A) 2 Ca3(PO4)2(s) + 10 C(s) + 6 SiO2(s) + heat -> P4(g) + 10 CO(g) + 6 CaSiO3(l)B) 4 PCl5(s) + heat -> P4(g) + 10 Cl2(g)C) 4 PH3(g) + heat -> P4(g) + 6 H2(g)D) P4O6(s) + heat -> P4(g) + 3 O2(g)

Q: What is not an appropriate method of making phosphoric acid?A) PH3(g) + 2 O2(g) -> H3PO4(l)B) PCl5(s) + 4 H2O(l) -> H3PO4(aq) + 5 HCl(aq)C) P4O10(s) + 6 H2O(l) -> 4 H3PO4(aq)D) P4(s) + 16 H2O(l) -> 4 H3PO4(aq) + 2 H2(g)

Q: In which compound is phosphorus in its lowest oxidation state? A) P4O6 B) PCl3 C) PH3 D) PCl5

Q: What is not a characteristic of white phosphorus? A) At temperatures less than 0C it is converted to red phosphorus. B) It bursts into flames when exposed to air, thus it is stored under water. C) It has a low melting point (44C). D) It is soluble in nonpolar solvent such as carbon disulfide CS2.

Q: What is the structure of white phosphorus? A) cage system of Px molecules B) discrete P atoms C) discrete P4 molecules D) polymeric chain-like structure

Q: A 0.010 M solution of which of the following would have the highest pH? A) CH3NH2 (Kb = 3.7 10-4) B) (CH3)2NH (Kb = 5.4 10-4) C) (CH3)3N (Kb = 1.8 10-5) D) NH3 (Kb = 6.5 10-5)

Q: A 0.010 M solution of which of the following would have the lowest pH? A) CH3NH2 (Kb = 3.7 10-4) B) NH2OH (Kb = 9.1 10-9) C) NH3 (Kb = 1.8 10-5) D) N2H4 (Kb = 8.0 10-7)

Q: What are the signs are expected for the entropy change S and free energy change G for the reaction below?N2H4(l) + N2O4(l) -> 3 N2(g) + 4 H2O(g) H = -1049 kJA) S = + and G = +B) S = + and G = -C) S = - and G = +D) S = - and G = -

Q: What statement about nitric acid is not true? A) It is a strong oxidizing agent. B) It is one of the more common strong acids and is essentially 100% dissociated in water. C) It often has a yellow color due to the formation of NO2. D) Its anhydride is N2O3.

Q: What is responsible for the brownish colored gas when copper dissolves in nitric acid?A) 2 NO(g) + O2(g) -> 2 NO2(g)B) 2 N2(g) + O2(g) -> 2 NO(g)C) NH4NO3(l) -> N2O(g) + 2 H2O(g)D) 2 NO2(g) -> N2O4(g)

Q: Why does Cu dissolve in concentrated nitric acid but not in concentrated hydrochloric acid? A) The chloride ion is a stronger oxidizing agent than the nitrate ion. B) The hydrochloric acid is not as strong as nitric acid. C) The hydrochloric acid produces insufficient hydronium ion to react with the copper. D) The nitrate ion is a stronger oxidizing agent than the hydronium ion.

Q: What is not a key step in the production of nitric acid by the Ostwald process?A) 4 NH3(g) + 5 O2(g) -> 4 NO(g) + 6 H2O(l)B) 2 NO(g) + O2(g) -> 2 NO2(g)C) 3 NO2(g) + H2O(l) -> 2 HNO3(aq) + NO(g)D) N2(g) + O2(g) -> 2 NO(g)

Q: If the anhydride of nitrous acid (HNO2) is N2O3 then what is the anhydride of nitric acid (HNO3)? A) NO2 B) NO3 C) N2O3 D) N2O5

Q: What is one method of making "laughing gas"?A) NH4NO3(s) + heat -> N2O(g) + 2 H2O(l)B) 3 Cu(s) + 2 NO3-(aq) + 8 H+(aq) -> 3 Cu2+(aq) + 2 NO(g) + 4 H2O(l)C) Cu(s) + 2 NO3-(aq) + 4 H+(aq) -> Cu2+(aq) + 2 NO2(g) + 2 H2O(l)D) 2 NO(g) + O2(g) -> 2 NO2(g)

Q: What is the chemical equation for the production of hydrazine?A) N2(g) + 3 H2(g) -> 2 NH3(g)B) 2 NH3(aq) + OCl-(aq) -> N2H4(aq) + H2O(l) + Cl-(aq)C) 4 NH3(g) + 5 O2(g) -> 4 NO(g) + 6 H2O(l)D) Au(s) + 3 NO3-(aq) + 6 H+(aq) + 4 Cl-(aq) -> AuCl4-(aq) + 3 NO2(g) + H2O(l)

Q: What is the Haber process? A) the isolation of N2 from the atmosphere B) the synthesis of ammonia, NH3 C) the synthesis of nitric acid, HNO3 D) the synthesis of hydrazine, N2H4

Q: In which compound is nitrogen in its lowest possible oxidation state? A) NH3 B) N2H4 C) HNO2 D) HNO3

Q: In which compound is nitrogen in its highest possible oxidation state? A) NH3 B) N2H4 C) HNO2 D) HNO3

Q: What statement about nitrogen is not consistent with its chemistry? A) It is a colorless, odorless, tasteless gas. B) It makes up 78% of the earth's atmosphere by volume. C) It is the most volatile component of liquid air with a boiling point of -196C. D) It readily reacts with hydrogen to form NH3 that is used in fertilizers.

Q: What is the most stable oxidation state for Bi in bismuth compounds? A) -3 B) 0 C) +3 D) +5

Q: Which element of group 5A has the most basic oxide? A) N B) P C) As D) Bi

Q: Which element of group 5A has the highest melting point? A) nitrogen B) white phosphorus C) antimony D) bismuth

Q: Which of the following species has its N atom or atoms in the -1 oxidation state? A) N2H4 B) NH2OH C) N2O D) HONO

Q: What is the range of oxidation states that are exhibited by P? A) from -3 to 0 B) from -3 to +3 C) from -3 to +5 D) from 0 to +5

Q: Mica cleaves into thin sheets because at the molecular level its structure is ________. A) one dimensional B) two dimensional C) three dimensional D) None of these

Q: What is the charge, n, in the ion Si4O10n that is found in talc?A) 2 -B) 4 -C) 8 -D) 10 -

Q: Which one of the following has a two-dimensional layer structure? A) silica, SiO2 B) zircon, ZrSiO4 C) talc, Mg3(OH)2(Si4O10) D) tremolite asbestos, Ca2Mg5(Si4O11)(OH)2

Q: SiO2 can be classified as a(n) A) amorphous solid. B) covalent network solid. C) ionic solid. D) molecular solid.

Q: What is the basic building block of all silicates? A) Si2O64- B) Si C) SiO2 D) SiO44-

Q: Approximately 90% of the Earth's crust is composed of what type of compounds? A) carbonates B) oxides C) silicates D) sulfides

Q: Which statement is most inconsistent with the chemistry of silicon? A) In nature, it is generally found combined with oxygen in SiO2 and in various silicate minerals. B) It crystallizes in a diamond-like structure and does not form the graphite-like allotrope. C) It is a hard, gray, semiconducting solid that melts at 1410C. D) It is obtained by oxidation of silica sand with coke.

Q: What is the oxidation number of carbon in CaC2?A) + 4B) + 1C) - 1D) - 2

Q: Which compound has carbon with a negative oxidation number? A) CO2 B) CaC2 C) HCN D) Na2CO3

Q: Which one of the following carbides is most likely to be nonstoichiometric? A) CaC2 B) Fe3C C) SiC D) None of these

Q: Which one of the following is a pseudohalide? A) CO32- B) OH- C) CN- D) SO42-

Q: What is not a reaction commonly associated with cyanide ion?A) H+(aq) + CN-(aq) -> HCN(aq)B) Ag+(aq) + CN-(aq) -> AgCN(s)C) 4 Au(s) + 8 CN-(aq) + O2(g) + 2 H2O(l) -> 4 Au(CN)2-(aq) + 4 OH-(aq)D) CN-(aq) + H2(g) -> HCN(aq) + H-(aq)