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國立臺北教育大學 105 學年度碩士班招生入學考試 自然科學教育學系碩士班 化學 科試題
共十題，每題 10 分
1. A gaseous binary compound (which is known to contain nitrogen) has a density 1.94 times that of oxygen gas (at the same temperature and pressure). When 1.31 g of the compound is completely burned in excess oxygen, 1.21 g of water is formed.
Determine the formula of the compound.
2. At a particular temperature, a 3.0L flask contains 2.4 moles of Cl2, 1.0 mole of NOCl, and 4.5x10-3 mole of NO. Calculate K at this temperature for the following reaction:
3. Gold (atomic mass = 197 g/mol) is plated from a solution of chlorauric acid, HAuCl4; it deposits on the cathode. Calculate the time it takes to deposit 0.65 g of gold, passing a current of 0.14 amperes. (1 faraday = 96,485 coulombs)
4. Calculate the pH of 5.0 X 10-4 M HCN. (Ka = 6.2 X 10-10)
5. A 140.0-g sample of water at 25.0°C is mixed with 100.0 g of a certain metal at 100.0°C. After thermal equilibrium is established, the (final) temperature of the mixture is 29.6°C. What is the heat capacity of the metal, assuming it is constant over the temperature range concerned?
6. On the basis of molecular orbitals, predict the bond order of NO- ,NO and NO+ , and provide a brief explanation.
7. Using the Slater’s rules, determine effective nuclear charge Z* for a 3p electron in P and Cl.
8. Name each of the following compounds:
a. CsF b. NaNO2 c. MnO2 d. P2S5 e. NH4NO3
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9. A sample of a monatomic ideal gas at 1.00 atm and 25 expands adiabatically and reversibly from 5.00 L to 12.5 L. Calculate the final temperature and pressure of the gas, the work associated with this process, and the change in internal energy.
10. A first-order reaction is 75.0% complete in 320 second. How long does it take for 90.0% completion?
