sg_chemistry_00

sg_chemistry_00 - AP Chemistry 2000 Scoring Guidelines The...

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AP Chemistry 2000 Scoring Guidelines These materials were produced by Educational Testing Service (ETS), which develops and administers the examinations of the Advanced Placement Program for the College Board. The College Board and Educational Testing Service (ETS) are dedicated to the principle of equal opportunity, and their programs, services, and employment policies are guided by that principle. The College Board is a national nonprofit membership association dedicated to preparing, inspiring, and connecting students to college and opportunity. Founded in 1900, the association is composed of more than 3,900 schools, colleges, universities, and other educational organizations. Each year, the College Board serves over three million students and their parents, 22,000 high schools, and 3,500 colleges, through major programs and services in college admission, guidance, assessment, financial aid, enrollment, and teaching and learning. Among its best-known programs are the SAT ® , the PSAT/NMSQT™, the Advanced Placement Program ® (AP ® ), and Pacesetter ® . The College Board is committed to the principles of equity and excellence, and that commitment is embodied in all of its programs, services, activities, and concerns. Copyright © 2001 by College Entrance Examination Board. All rights reserved. College Board, Advanced Placement Program, AP, and the acorn logo are registered trademarks of the College Entrance Examination Board. The materials included in these files are intended for non-commercial use by AP teachers for course and exam preparation; permission for any other use must be sought from the Advanced Placement Program. Teachers may reproduce them, in whole or in part, in limited quantities, for face-to-face teaching purposes but may not mass distribute the materials, electronically or otherwise. These materials and any copies made of them may not be resold, and the copyright notices must be retained as they appear here. This permission does not apply to any third-party copyrights contained herein.
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AP ® Chemistry 2000 Scoring Standards Copyright © 2000 College Entrance Examination Board and Educational Testing Service. All rights reserved. AP is a registered trademark of the College Entrance Examination Board. Question 1 (10 points) (a) K c = 2 2 2 2 2 ] S H [ ] S [ ] H [ or K c = 2 2 2 2 2 S) (H ) (S ) (H 1 pt. No point earned for a K p expression or if an exponent is incorrectly used (b) (i) [H 2 ] = 2 [S 2 ] = L 25 . 1 ) mol 10 72 . 3 )( 0 . 2 ( 2 × = 5.95 × 10 2 M 1 pt. (ii) [H 2 S] = L 25 . 1 ) mol 10 72 . 3 )( 0 . 2 ( mol 10 . 0 2 × = 2.05 × 10 2 M 2 pts. or [H 2 S] = 0.0800 M 0.0595 M = 0.0205 M Notes: One point is earned for getting the correct number of moles of H 2 S ; second point is earned for dividing by 1.25 L and getting a consistent answer. Although not correct, one point may be earned for calculating the initial [H 2 S] (see below) and using that value as the equilibrium H 2 S concentration.
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sg_chemistry_00 - AP Chemistry 2000 Scoring Guidelines The...

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