ap07_chemistry_form_b_sgs_final_complete

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Unformatted text preview: added. Both buffer solutions have the same acid to conjugate-base mole ratio in the formula below. [H+] = Ka [HC2H3O2 ] ⎡ C2 H 3 O 2 − ⎤ ⎣ ⎦ One point is earned for the correct answer involving ratio of acid to base in the buffer. Therefore, the buffers have the same [H+] and pH. © 2007 The College Board. All rights reserved. Visit apcentral.collegeboard.com (for AP professionals) and www.collegeboard.com/apstudents (for students and parents). AP® CHEMISTRY 2007 SCORING GUIDELINES (Form B) Question 6 First Ionization Energy (kJ mol−1) 1,251 496 738 1,000 Element 1 Element 2 Element 3 Element 4 Second Ionization Energy (kJ mol−1) 2,300 4,560 1,450 2,250 Third Ionization Energy (kJ mol−1) 3,820 6,910 7,730 3,360 The table above shows the first three ionization energies for atoms of four elements from the third period of the periodic table. The elements are numbered randomly. Use the information in the table to answer the following questions. (a) Which element is most metallic in character?...
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This note was uploaded on 10/01/2009 for the course OC 9876 taught by Professor Dq during the Spring '09 term at UC Merced.

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