Oganic Lab
Chemistry 1211 Prof. Dan Schwartz
Exam #2
Thursday, 3/13/2003 7:00 – 8:30 P.M.
There is a single correct choice for each question. Answer all questions on the Scantron sheet by filling in the proper bubble with a #2 pencil. If you change an answer, erase the undesired mark thoroughly. Be sure to fill in the boxes for your student number, name and lab section; then correctly fill in the corresponding bubbles beneath them. A periodic table and other useful information are attached to the back of the exam. There are 4 exam pages and 26 questions. Check to be sure you have answered them all! 1. (zero points) Which version of the exam do you have? (a) A (b) B
2. (5 points) Which two ions have the same electron configuration in the ground state? (a) Rb+ and Cs+ (b) Ba2+ and I– (c) Se2– and I– (d) Fe2+ and Fe3+
3. (5 points) List the elements Na, Ca, Rb, Cl, He in order of decreasing first ionization energy. (a) He > Cl > Ca > Na > Rb (b) He > Na > Ca > Cl > Rb (c) He > Na > Cl > Ca > Rb (d) Rb > Ca > Cl > Na > He
4. (5 points) Which ionic compound would be expected to have the highest lattice energy? (a) NaCl (b) MgO (c) AlF3 (d) Al2O3
5. (5 points) Which element, indicated by letter on the periodic table below, has a 2+ ion with electron configuration [Ar]3d10 ? (a) A (b) B (c) C (d) D
Exam #2
Page 1
6. (5 points) Element A has an electronegativity of 0.8 and element B has an electronegativity of 3.0. Which statement best describes the bonding in A3B? (a) The AB bond is largely covalent with a d– charge on A. (b) The AB bond is largely covalent with a d+ charge on A. (c) The AB bond is largely ionic with A as the cation. (d) The AB bond is largely ionic with A as the anion.
7. (5 points) Which is the most acceptable electron dot structure for N2H2? .. .. (a) H—N—N—H .. .. .. .. (b) H—N N—H (c) H—N N—H .. .. (d) H—N N—H
8. (5 points) Given that the electronegativity is 2.5 for both C and S, which is the best electron dot structure for
Exam #2
Thursday, 3/13/2003 7:00 – 8:30 P.M.
There is a single correct choice for each question. Answer all questions on the Scantron sheet by filling in the proper bubble with a #2 pencil. If you change an answer, erase the undesired mark thoroughly. Be sure to fill in the boxes for your student number, name and lab section; then correctly fill in the corresponding bubbles beneath them. A periodic table and other useful information are attached to the back of the exam. There are 4 exam pages and 26 questions. Check to be sure you have answered them all! 1. (zero points) Which version of the exam do you have? (a) A (b) B
2. (5 points) Which two ions have the same electron configuration in the ground state? (a) Rb+ and Cs+ (b) Ba2+ and I– (c) Se2– and I– (d) Fe2+ and Fe3+
3. (5 points) List the elements Na, Ca, Rb, Cl, He in order of decreasing first ionization energy. (a) He > Cl > Ca > Na > Rb (b) He > Na > Ca > Cl > Rb (c) He > Na > Cl > Ca > Rb (d) Rb > Ca > Cl > Na > He
4. (5 points) Which ionic compound would be expected to have the highest lattice energy? (a) NaCl (b) MgO (c) AlF3 (d) Al2O3
5. (5 points) Which element, indicated by letter on the periodic table below, has a 2+ ion with electron configuration [Ar]3d10 ? (a) A (b) B (c) C (d) D
Exam #2
Page 1
6. (5 points) Element A has an electronegativity of 0.8 and element B has an electronegativity of 3.0. Which statement best describes the bonding in A3B? (a) The AB bond is largely covalent with a d– charge on A. (b) The AB bond is largely covalent with a d+ charge on A. (c) The AB bond is largely ionic with A as the cation. (d) The AB bond is largely ionic with A as the anion.
7. (5 points) Which is the most acceptable electron dot structure for N2H2? .. .. (a) H—N—N—H .. .. .. .. (b) H—N N—H (c) H—N N—H .. .. (d) H—N N—H
8. (5 points) Given that the electronegativity is 2.5 for both C and S, which is the best electron dot structure for