【文章內(nèi)容簡介】 an the H2O(l) freezes. (2) The H2O(l) freezes faster than the H2O(s) melts. (3) The mass of H2O(s) must equal the mass of H2O(l). (4) The mass of H2O(l) and the mass of H2O(s) each remain constant. ? 21 A molecule of an anic pound contains at least one atom of (1) carbon (3) nitrogen (2) chlorine (4) oxygen ? 22 In a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is equal to the (1) activation energy (2) entropy of the system (3) heat of fusion (4) heat of reaction Q 20 deals phase equilibrium。 Q 21 based on definition of anic pounds and Q 23 deals with thermodynamics (Items 120 amp。 Table I title) ? Q20 Given the equation representing a phase change at equilibrium: H2O(s) H2O(l) Which statement describes this equilibrium? (1) The H2O(s) melts faster than the H2O(l) freezes. (2) The H2O(l) freezes faster than the H2O(s) melts. (3) The mass of H2O(s) must equal the mass of H2O(l). (4) The mass of H2O(l) and the mass of H2O(s) each remain constant. ? Q21 A molecule of an anic pound contains at least one atom of (1) carbon (3) nitrogen (2) chlorine (4) oxygen ? Q22 In a chemical reaction, the difference between the potential energy of the products and the potential energy of the reactants is equal to the (1) activation energy (2) entropy of the system (3) heat of fusion (4) heat of reaction Q 20 deals phase equilibrium。 Q 21 based on definition of anic pounds and Q 23 deals with thermodynamics (Items 120 amp。 Table I title) ? Q23 A carboncarbon triple bond is found in a molecule of (1) butane (3) butene (2) butanone (4) butyne ? Q24 Which statement describes one characteristic of an operating electrolytic cell? (1) It produces electrical energy. (2) It requires an external energy source. (3) It uses radioactive nuclides. (4) It undergoes a spontaneous redox reaction. ? Q25 Which pound when dissolved in water is an Arrhenius acid? (1) CH3OH (3) NaCl (2) HCl (4) NaOH Q 23 deals with anic hydrocarbons (Table Q)。 Q 24 is based on electrochemistry (Items 142143)。 Q 25 is based on Acids and Bases (Table K) ? 26 An acid can be defined as an (1) H+ acceptor (3) OH acceptor (2) H+ donor (4) OH donor ? 27 Which nuclear emission has no charge and no mass? (1) alpha particle (3) gamma ray (2) beta particle (4) positron ? 28 During which process can milliliters of a M HCl(aq) solution be used to determine the unknown concentration of a given volume of NaOH(aq) solution? (1) evaporation (3) filtration (2) distillation (4) titration Q 26, 28 deal with acids and bases (items 144155 : Q 27 deals with nuclear chemistry (item: 178178 and reference table ) Q 2930: deal with nuclear reactions (Items 178189。 Use Table N for Q 29)) 30 Which reaction is acpanied by the release of the greatest amount of energy? (1) bustion of 10. g of propane (2) electrolysis of 10. g of water (3) nuclear fission of 10. g of uranium (4) oxidation of 10. g of iron Q 31: deal with atoms, subatomic particles and isotopes (Items 69) Q 32 deals with Lewis Dot Structures of Atoms (Items 89 and 90) Q 33 : deal with Bonding (Items). Q 34 is a sig figures Question (Item 23) ? Q33 Which element forms a pound with chlorine with the general formula MCl? (1) Rb (3) Re (2) Ra (4) Rn ? Q34 A sample of an element has a mass of grams and a volume of cubic centimeters. To which number of significant figures should the calculated density of the sample be expressed? (1) 5 (3) 3 (2) 2 (4) 4 Q 35 : deal with periodic Trends (Items 7287). ? Q 35 Which characteristics both generally decrease when the elements in Period 3 on the Periodic Table are considered in order from left to right? (1) nonmetallic properties and atomic radius (2) nonmetallic properties and ionization energy (3) metallic properties and atomic radius (4) metallic properties and ionization energy Q 36 are on Bonding. Q 36 – definition。 Q 37 valence electrons and octet rule ? 36 Which formula is both a molecular and an empirical formula? (1) C6H12O6 (3) C3H8O (2) C2H4O2 (4) C4H8 ? 37 An atom of argon in the ground state tends not to bond with an atom of a d