2016 AP Chemistry化學真題系列之簡答題免費下載

歷年AP Chemistry化學系列

真題與答案下載

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2016 AP Chemistry Free-Response Questions Free Download

2016 AP 化學簡答題部分免費下載

考試時會提供花常用的等式與常量

以及化學元素周期表

此套Section II試卷共7題

每道大題含有不同數量的小題

共計時1小時45分鐘

其中1-3題各需23分鐘，每題10分

4-7題各需9分鐘，每題4分

完整版下載鏈接見文末

部分真題預覽：

1）A student investigates the enthalpy of solution, ΔH_soln, for two alkali metal halides, LiCl and NaCl. In addition to the salts, the student has access to a calorimeter, a balance with a precision of?±0.1g, and a thermometer with a precision of ±0.1°C.

1. To measure? ΔH_soln for LiCl, the student adds 100.0g of water initially at 15.0°C?to a calorimeter and adds 10.0g of LiCl(s), stirring to dissolve. After the LiCl dissolves completely, the maximum temperature reached by the solution is 35.6°C.
   1. Calculate the magnitude of the heat absorbed by the solution during the dissolution process, assuming that the specific heat capacity of the solution is4.18 J/(g.°C)?. Include units with your answer.
   2. Determine the value of delta ΔH_soln for LiCl in kJ/mol_rxn.

To explain why ΔH_soln?for?NaCl is different than that for LiCl, the student investigates factors that affect ΔH_soln??and finds that ionic radius and lattice enthalpy (which can be defined as the?ΔH associated with the separation of a solid crystal into gaseous ions) contribute to the process. The student consults references and collects the data shown in the table below.

(b) Write the complete electron configuration for the Na⁺?ion in the ground state.

(c) Using principles of atomic structure, explain why the Na⁺?ion?is larger than the Li⁺?ion.

(d) Which salt, LiCl?or NaCl, has the greater lattice enthalpy? Justify your answer.

(e) Below is a representation of a portion of a crystal of LiCl. Identify the ions in the representation by writing the appropriate formulas ( Li⁺ or Cl^-)?in the boxes below.

(f) The lattice enthalpy of LiCl is positive, indicating that it takes energy to break the ions apart in LiCl. However, the dissolution of LiCl in water is an exothermic process. Identify all particle-particle interactions that contribute significantly to the dissolution process being exothermic. For each interaction, include the particles that interact and the specific type of intermolecular force between those particles.

完整版真題資料可以底部二維碼免費領取↓↓↓

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