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ap16_chemistry_q1.pdf
Preview of Sample Responses Q1
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📊 Size: 1.77 MB
👤 Author: The College Board
⬇️ Downloads: 75

Summary

A student investigates the enthalpy of solution for LiCl and NaCl, using a calorimeter, balance, and thermometer. To measure ΔHsoln for LiCl, 100.0 g of water and 10.0 g of LiCl are mixed, resulting in a temperature increase from 15.0°C to 35.6°C. The heat absorbed by the solution is calculated as q = mcΔT = 9,470 J = 9.47 kJ. The ΔHsoln for LiCl is then determined as -40.1 kJ/molrxn. The student also investigates factors affecting ΔHsoln, including ionic radius and lattice enthalpy, and collects data on Li+ and Na+ ions. The complete electron configuration for Na+ is 1s2 2s2 2p6. The Na+ ion is larger than Li+ due to its valence electrons being in a higher principal energy level. LiCl has a greater lattice enthalpy than NaCl due to stronger Coulombic attractions between ions. The dissolution of LiCl in water is exothermic due to ion-dipole interactions between Li+/Cl- ions and polar water molecules.

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Description

A student investigates the enthalpy of solution for LiCl and NaCl, using a calorimeter, balance, and thermometer.

Technical Information

  • File Format: PDF
  • File Size: 1.77 MB
  • Pages: 8
  • Language: EN
  • Author: The College Board
  • Total Downloads: 75
  • Last Updated: 3 weeks ago

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