SAT II Chemistry摸底卷.docVIP

Questions 1-3 refer to the following pieces of laboratory equipment.(A) Condenser（冷凝器）(B) Funnel（漏斗）(C) Pipet（移液管）(D) Balance（天平）(E) Barometer（气压计）1. Commonly used to transfer an exact volume of liquid from one container to another2. Commonly used in a distillation（蒸馏） setup3. Commonly used in a filtration（过滤） setup Question 4-6 refer to the following informationNa2CrO4, a soluble yellow solidPbCrO4, an insoluble yellow solid NaNO3, a soluble white solidPb(NO3)2, a soluble white solid(A) Yellow solid and colorless solution(B) Yellow solid and yellow solution(C) White solid and colorless solution(D) No solid and yellow solution(E) No solid and colorless solution4. Observed when 1.0 mol of Na2CrO4 and 2.0 mol of Pb(NO3)2 are mixed with 1L of water5. Observed when 3.0 mol of Na2CrO4 and 1.0 mol of Pb(NO3)2 are mixed with 1L of water6. Observed when 1.0 mol of NaNO3 and 1.0 mol of Pb(NO3)2 are mixed with 1L of water.Questions 7-10 refer to the following pairs of substances.(A) NH3 and N2H4(B) 16O and 17O(C) NH4Cl and NH4NO3(D) CH3OCH3 and CH3CH2OH(E) O2 and O37. Are isotopes（同位素）8. Have both ionic（离子键） and covalent bonds（共价键）9. Are allotropes（同素异形体）10. Are strong electrolytes（电解质） in aqueous solutionQuestion 11-13 refer to the following gases(A) O3(B) O2(C) CO(D) Cl2(E) SO211. Contributes to acid rain12. In the stratosphere（平流层）, screens out a large fraction of ultraviolet rays（紫外线） from the Sun13. Is a product of the incomplete combustion（燃烧） of hydrocarbonsQuestions 14-17 refer to the lettered solutions in the laboratory schemes represented below14. Has a hydroxide ion（氢氧根离子） concentration（浓度） of 10-7 M at 298K15. Has the highest pH at 298K16. Has a pH greater than 7, but less than 13 at 298K17. Has a pH greater than 2, but less than 7 at 298KIII101.Carbon is a nonmetalBECAUSECarbon atoms can bond with each other103 Covalent bonds must be broken for a liquid to boilBECAUSEHeat must be released for a liquid to change into a gas 105As ice absorbs heat and begins to melt, its temperature remains constantBECAUSEThe absorbed heat is consumed by the breaking of intermolecular interactions（分子间的相互作用）107The rate of a reaction is accelerated by increasing temperatureBECAUSEA large equilibrium constant favors the formation of product.108Hydrofluoric acid, HF(aq), is a weaker electrolyte than hydrochloric acid, HCl(aq),BECAUSEFluorine has a lower electronegativity than chlorine.109A nonpolar（非极性） molecule can have polar（极性） bondsBECAUSEPolar bonds can be symmetrically arranged（对称排列） in a molecule so that there are no net poles110The electrolysis of potassium iodide, KI, produces electrical energyBECAUSEElectrons flow from the anode to the cathode.111.C2H2 and C6H6 have the same chemical and physical propertiesBECAUSEC2H2 and C6H6 have the same percentages by mass of hydrogen112.The melting of ice is an exothermic（放热）processBECAUSEWater has a relatively high specific heat capacity（热容）113.A 2g sample of nitrogen（N2）and 2g sample of oxygen contain the same number of moleculesBECAUSEEqual masses of gaseous substances contain the same number of molecules.114.When an atom absorbs a photon of visible light, one of its electrons is promoted to a higher energy stateBECAUSEAn electron has a negative charge115.A 1 mol sample of electrons is required to reduce 0.5 mol of chlorine gas（氯气） to chloride ions（氯离子）BECAUSEChlorine molecules are diatomic（双原子） and the charge on the chloride ion is -1.C4H10(g)+ .O2(g) .CO2(g)+ .H2O(l)18. When the above equation is balanced using the lowest whole-number terms, the coefficient（化学计量数） of CO2 is (A) 2(B) 4(C) 8(D) 10(E) 13 19. If two atoms that differ in electronegativity（电负性） combine by chemical reaction and share electrons（电子）, the bond that joins them will be(A) metallic（金属键）(B) ionic（离子键）(C) a hydrogen bond（氢键）(D) nonpolar covalent（非极性共价键）(E) polar covalent（极性共价键）NH3(aq)+ H2CO3(aq) NH4+(aq)+ HCO3-(aq)20. In the reaction represented above, NH4+ acts as a(n)(A) indicator（指示剂） (B) hydrate（水合物）(C) acid（酸）(D) base（碱）(E) salt（盐）21. A 600-milliliter container holds 2 moles of O2(g), 3 moles of H2(g), and 1 mole of He(g). Total pressure within the container is 760 torr. What is the partial pressure of O2?(A) 127 torr(B) 253 torr(C) 380 torr(D) 507 torr(E) 760 torr22. Sodium peroxide, Na2O2, and water react in the flask at 25 according to the equation and in the diagram above. If water levels are equal inside and outside the beaker, the gas pressure（气压） inside the beaker is equal to the (A) Pressure of oxygen gas collected(B) vapor pressure of water at 25(C) vapor pressure of oxygen gas collected and atmospheric pressure(D) sum of vapor pressure of water at 25 and atmospheric pressure(E) sum of pressure of oxygen gas collected and vapor pressure of water at 25. Al(s) +.O2(g) .Al2O3(s)23. When the equation representing the reaction shown above is completed and balanced and all coefficients are reduced to lowest whole-number terms, the coefficient of O2(g) is (A) 1(B) 2(C) 3(D) 4(E) 624. Elements H and J lie in the same period. If the atoms of H are smaller than the atoms of J, then compared to atoms of J, atoms of H are most likely to (A) exist in a greater number of isotopes（同位素）(B) exist in a lesser number of isotopes(C) exist in a greater number of oxidation states（氧化态）(D) have a greater positive charge in their nuclei （原子核）(E) have a lesser positive charge in their nuclei.NF3(g)+.H2O(g).HF(g)+.NO(g)+.NO2(g)25. When the equation for the reaction above is balanced, how many moles of NF3 would be required to react completely with 6 moles of H2O?(A) 0.5 mole(B) 1 mole(C) 2 mole(D) 3 mole(E) 4 mole26. A compound with a molecular weight of 56 amu has an empirical formula（经验式） of CH2. What is its molecular formula（分子式）?(A) C2H2(B) C2H4(C) C4H8(D) C4H10(E) C6H1229. In 12.4 hours, a 100 gram sample of an element decays so that its mass is 25 grams. What is the approximate half-life（半衰期） of this radioactive substance（放射性物质）?(A) 1.6 hours(B) 3.1 hours(C) 6.2 hours(D) 24.8 hours(E) 49.6 hours30. Of the following, which is an example of an oxidation-reduction reaction（氧化还原反应）?(A) Fe(s)+ Sn2+(aq) Sn(s)+ Fe2+(aq)(B) HCO3-(aq)+OH-(aq) CO32-(aq)+ H2O(l)(C) Pb2+(aq)+ 2I-(aq) PbI2(s)(D) HCl(g)+ NH3(g) NH4Cl(s)27. When two colorless liquid reagents are mixed, which of the following observations would suggest that a chemical reactio