| 4月28日 第3節 教育研究所乙組 | 誠實是我們珍視的美德， 我們喜愛「拒絕作弊，堅守正直」的你！ |
| 科目：化學 | （共3頁 第1頁） |
| I | 選擇題 (40%) | ||||||||||||
| 1. | An isotope of the element potassium has a mass number of 39 and an atomic number of 19. The number of electrons, protons, and neutrons, respectively, in a neutral atom of this isotope is A) 19, 20, and 19 , B) 19, 39, and 20 , C) 19, 19, and 20 , D) 20, 19, and 19 E) 19, 19, and 39 |
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| 2. | A homogeneous mixture contains two pure compounds dissolved in water. The two compounds could be separated by A) chromatography. , B) addition of acid. , C) addition of base. , D) filtration. E) centrifugation. |
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| 3. | The density of lead is 11.4 g/mL. Express the density in g/m3. A) 1.14 ×106 g/m3 , B) 1.14 ×103 g/m3 , C) 1.14 ×107 g/m3 , D) 1.14 ×10-5 g/m3 E) 1.14 ×104 g/m3 |
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| 4. | A solution was prepared by mixing 50.0 mL of 0.150 M Na2SO4(aq) with 125 mL of 0.262 M Na2SO4(aq). Assuming that the volumes are additive, what is the molarity of Na2SO4(aq) in the final solution?
A) 0.230 M , B) 0.0403 M , C) 0.187 M , D) 0.0429 M , E) 0.460 M |
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| 5. | Consider the following reaction: 2Mn(OH)3(s) + 6H+(aq) + 6I-(aq) a2Mn2+(aq) + 2I3-(aq) + 6H2O(l) In this reaction, A) I-(aq) transfers electrons to manganese in Mn(OH)3(s). B) Mn(OH)3(s) is the reducing agent. C) H+(aq) is the oxidizing agent. D) I-(aq) is the oxidizing agent. E) I-(aq) gains electrons from Mn(OH)3(s). |
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| 6. | Consider the following reaction: NH4+(aq) + NO3-(aq) →N2O(g) + 2H2O(l) Identify the reducing agent. A) H+, B) N2O , C) H2O , D) NO3- E) NH4+ |
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| 7. | How many mL of 0.200 M HCl(aq) are neutralized by 5.00 g of Mg(OH)2(s)?
A) 21.4 mL , B) 2330 mL , C) 857 mL , D) 429 mL , E) 1710 mL |
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| 8. | Consider the following reaction: 4FeS2(s) + 11O2(g) →2Fe2O3(s) + 8SO2(g) How many grams of sulfur dioxide are produced from the reaction of 1.000 kg of FeS2(s)? A) 534.0 g , B) 267.0 g , C) 2136 g , D) 1068 g , E) 4272 g |
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| 9. | Calculate the volume occupied by 10.0 g of nitrogen gas at STP (standard temperature and pressure). A) 8.00 L , B) 22.4 L , C) 8.75 L , D) 16.0 L , E) 4.00 L |
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| 10. | Which gaseous molecules (choose one species) effuse fastest?
A) H2O(g) , B) Ar(g) , C) CO2(g) , D) NO(g) , E) Ne(g) |
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| 11. | If the standard enthalpy of combustion of ethanol, C2H2OH(l), is -1368 kJ -1mol-1, calculate the heat output if 1.00 kg of ethanol is burned.
A) 63.0 ×103 kJ , B) 33.7 ×103 kJ , C) 1.37 ×1033 kJ , D) 29.7 ×103 kJ E) 33.7 kJ |
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| 12. | The standard enthalpies of combustion of CH3OH(l), C(s), and hydrogen gas are -726, -394, and -286 kJ-1mol-1, respectively. What is the standard enthalpy of formation of CH3OH(l)?
A) -620 kJ-1mol-1, B) -240 kJ-1mol-1, C) -484 kJ-1mol-1, D) +620 kJ-1mol-1 E) -240 kJ-1mol-1-1 |
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| 13. | Calculate the wavelength of x-rays of frequency 5.00 ×1017 Hz.
A) 1.20 nm , B) 0.398 nm , C) 0.600 m , D) 1.20 m , E) 0.600 nm |
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| 14. | What is the ground-state electron configuration of a copper atom?
A) [Ar]3d104s1, B) [Ar]3d84s2, C) [Ar]3d94s1, D) [Ar]3d94s2, E) [Ar]3d104s2 |
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| 15. | How many dots should one place around the symbol for phosphorus, P, when writing the Lewis symbol for the atom?
A) 5 , B) 15 , C) 8 , D) 4 , E) 3 |
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| 16. | Which of the following has bonds with the most ionic character? A) KBr , B) NaI , C) NaBr , D) KI , E) RbI |
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| 17. | What is the shape of CO2? A) linear , B) angular , C) trigonal planar , D) T-shaped , E) trigonal bipyramidal |
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| 18. | How many sigma and how many pi bonds are present in CH2=CH-CH=CH-CHO ? A) 9 sigma and 3 pi , B) 8 sigma and 6 pi , C) 10 sigma and 3 pi D) 8 sigma and 4 pi , E) 11 sigma and 3 pi |
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| 19. | Which of the following is most volatile?0
A) CBr3H , B) CCl4, C) CBr2H2, D) CCl3H , E) CBr4 |
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| 20. | Which of the following has the greatest surface tension? A) water , B) HBr , C) benzene , C6H6 D) propane, C3H8, E) NH3 |
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| II | 問答題與計算題 (60%, 每題10分) | ||||||||||||
| 21. | An unknown organic compound was found to have a molar mass of 32.04 g/mol and combustion experiment gives mass percentage of 37.5% C, 12.6% H, and 49.9% O.
i. Draw the possible Lewis structure of the compound ii. Determine the bond angles about the carbon and oxygen atoms. iii. Give the hybridization of the carbon and oxygen atoms. iv. Predict whether the molecule is polar or not ? |
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| 22. | The rate constant k of reaction 2N2O5(g) a 4NO2(g) + O2(g) was recorded at different temperatures, as shown in the table: Please calculate the activation energy Ea for this reaction.
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| 23. | Assume at some temperature, hydrogen gas and iodine gas react to form HI gas, the equilibrium constant is 1.00×102. If at the same condition, we put 5.00×10-1 atm HI, 1.00×10-2 atm H2, and 5.00×10-3 atm I2 in 5.00 L bottle together, what will be the equilibrium gas pressure for all species ? | ||||||||||||
| 24. | Calculate the following aqueous solution, what will be their pH value and pOH value at 25oC?
a. 1.0×10-3 M OH- b. 1.0 M H+ |
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| 25. | Calculate the pH value of 0.1 M NH4Cl aqueous solution. (Kb for NH3 is 1.8×10-5) | ||||||||||||
| 26. | Calculate the molar solubility of silver chloride (AgCl) in 0.10 M NH3(aq), given that Ksp =1.6×10-10 for silver chloride and Kf =1.6 ×107 for the ammonia complex of Ag+ ions, Ag(NH3)2+. | ||||||||||||