Quiz7KEY

Quiz7KEY - Chem 6A 2011 (Sailor) Name: Student ID Number:...

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Unformatted text preview: Chem 6A 2011 (Sailor) Name: Student ID Number: Section Number: QUIZ #7 VERSION A KEY Some useful constants and relationships: Specific heat capacities (in J/g.K): H2O(l) = 4.184; Al(s) = 0.900; Cu(s) = 0.387; Steel(s) = 0.45 1 atm = 760 Torr 1J = 1kg.m2/s2 1 eV = 1.6022 x 10-19J 101.325 J = 1 L.atm . . -1 . -1 . -1 . -1 R = Ideal gas constant: 0.08206 L atm mol K = 8.31451 J mol K Avogadro constant: 6.022 x 1023 mole-1 Planck's constant = h = 6.6261 x 10-34 J.s 8 RH = 1.097 x 10-2 nm-1 c = speed of light: 3.00 x 10 m/s -2 . C2 = second radiation constant = 1.44 x 10 K m q = C pm Δ T 1 Emitted power (W) Tλmax = C2 = (cons tan t )T 4 e = mc 2 c = λν 5 Surface area (m2 ) ⎛ྎ 1 ⎛ྎ Z 2 ⎞ྏ 1 ⎞ྏ hc 1 = R H ⎜ྎ 2 − 2 ⎟ྏ E= E (in Joules) = −2.18 × 10−18 ⎜ྎ 2 ⎟ྏ E = hν λ λ ⎝ྎ n ⎠ྏ ⎝ྎ n1 n 2 ⎠ྏ € Chem 6A 2011 (Sailor) QUIZ #7 1. Rank each set of elements in order of decreasing size. The first one is done for you as an example. (10 pts) (a) Li, Na, K K > Na > Li (b) Sr, Ba, Ca Ba > Sr > Ca (5 pts if correct, all or nothing) (c) O, O-, O2- O2- > O- > O (5 pts if correct, all or nothing) 2. Fill in the electrons in the valence level orbital diagrams below to provide a ground state electron configuration for each gas phase atom or ion that is consistent with the magnetic property given and label the valence s, d, and p shells with the correct principle quantum number. The first one is done as an example. (20 pts) Paramagnetic Br ↑↓ ↑↓ ↑↓ ↑↓ Diamagnetic Cd2+ € € € € ↑↓ ↑↓ € € € ↑↓ ↑↓ € ↑↓ € ↑↓ ↑ € € ↑↓ 4d Paramagnetic Cu € € 4s ↑↓ 4p ↑↓ 5s ↑ ↑↓ 3d 4s € ↑↓ 5p € ↑↓ ↑↓ 3d ↑↓ 4p 2 pts for correct quantum shell numbers, all or nothing. 8 points for correct electron € € € € € configuration, all or nothing This was homework problem 8.61 in the book. 3. Identify each element from the given electron configuration for its neutral atom. Indicate the number of unpaired electrons in each. The first one is done as an example. (20 pts) This was homework problem 8.30 in the book. element Electron configuration # unpaired electrons P [Ne] 3s23p3 3 Sr (3 pts) Si (3 pts) N e(3 pts) Fe (3 pts) [Kr] 5s 2 0 (2 pts) [Ne] 3s23p2 2 (2 pts) [He] 2s22p6 0 (2 pts) [Ar] 4s23d6 4 (2 pts) Chem 6A 2011 (Sailor) Name: Student ID Number: Section Number: QUIZ #7 VERSION B KEY Some useful constants and relationships: Specific heat capacities (in J/g.K): H2O(l) = 4.184; Al(s) = 0.900; Cu(s) = 0.387; Steel(s) = 0.45 1 atm = 760 Torr 1J = 1kg.m2/s2 1 eV = 1.6022 x 10-19J 101.325 J = 1 L.atm . . -1 . -1 . -1 . -1 R = Ideal gas constant: 0.08206 L atm mol K = 8.31451 J mol K Avogadro constant: 6.022 x 1023 mole-1 Planck's constant = h = 6.6261 x 10-34 J.s 8 RH = 1.097 x 10-2 nm-1 c = speed of light: 3.00 x 10 m/s -2 . C2 = second radiation constant = 1.44 x 10 K m q = C pm Δ T 1 Emitted power (W) Tλmax = C2 = (cons tan t )T 4 e = mc 2 c = λν 5 Surface area (m2 ) ⎛ྎ 1 ⎛ྎ Z 2 ⎞ྏ 1 ⎞ྏ hc 1 = R H ⎜ྎ 2 − 2 ⎟ྏ E= E (in Joules) = −2.18 × 10−18 ⎜ྎ 2 ⎟ྏ E = hν λ λ ⎝ྎ n ⎠ྏ ⎝ྎ n1 n 2 ⎠ྏ € Chem 6A 2011 (Sailor) QUIZ #7 1. Rank each set of elements in order of decreasing size. The first one is done for you as an example. (10 pts) (a) Li, Na, K K > Na > Li (b) N, As, P As > P > N (5 pts if correct, all or nothing) (c) S, S-, S2- S2- > S- > S (5 pts if correct, all or nothing) 2. Fill in the electrons in the valence level orbital diagrams below to provide a ground state electron configuration for each gas phase atom or ion that is consistent with the magnetic property given and label the valence s, d, and p shells with the correct principle quantum number. The first one is done as an example. (20 pts) Paramagnetic Br ↑↓ ↑↓ ↑↓ ↑↓ Paramagnetic Ru2+€ € € ↑↓ € ↑ 5s € ↑↓ ↑↓ ↑↓ € ↑↓ € € ↑ € ↑↓ ↑ 4p ↑ € € ↑ 4d Paramagnetic Ge € € ↑↓ ↑↓ 3d 4s € ↑↓ 5p € ↑↓ ↑↓ ↑ ↑ 4s 3d 4p 2 pts for correct quantum shell numbers, all or nothing. 8 points for correct electron configuration, all€ nothing € or € € € € € This was homework problem 8.61 in the book. 3. Identify each element from the given electron configuration for its neutral atom. Indicate the number of unpaired electrons in each. The first one is done as an example. (20 pts) This was homework problem 8.30 in the book. element Electron configuration # unpaired electrons P [Ne] 3s23p3 3 Rb (3 pts) Al (3 pts) Cl (3 pts) Co (3 pts) [Kr] 5s1 1 (2 pts) [Ne] 3s23p1 1 (2 pts) [Ne] 3s23p5 1 (2 pts) [Ar] 4s23d7 3 (2 pts) Chem 6A 2011 (Sailor) Name: Student ID Number: Section Number: QUIZ #7 VERSION C KEY Some useful constants and relationships: Specific heat capacities (in J/g.K): H2O(l) = 4.184; Al(s) = 0.900; Cu(s) = 0.387; Steel(s) = 0.45 1 atm = 760 Torr 1J = 1kg.m2/s2 1 eV = 1.6022 x 10-19J 101.325 J = 1 L.atm . . -1 . -1 . -1 . -1 R = Ideal gas constant: 0.08206 L atm mol K = 8.31451 J mol K Avogadro constant: 6.022 x 1023 mole-1 Planck's constant = h = 6.6261 x 10-34 J.s 8 RH = 1.097 x 10-2 nm-1 c = speed of light: 3.00 x 10 m/s -2 . C2 = second radiation constant = 1.44 x 10 K m q = C pm Δ T 1 Emitted power (W) Tλmax = C2 = (cons tan t )T 4 e = mc 2 c = λν 5 Surface area (m2 ) ⎛ྎ 1 ⎛ྎ Z 2 ⎞ྏ 1 ⎞ྏ hc 1 = R H ⎜ྎ 2 − 2 ⎟ྏ E= E (in Joules) = −2.18 × 10−18 ⎜ྎ 2 ⎟ྏ E = hν λ λ ⎝ྎ n ⎠ྏ ⎝ྎ n1 n 2 ⎠ྏ € Chem 6A 2011 (Sailor) QUIZ #7 1. Rank each set of elements in order of decreasing size. The first one is done for you as an example. (10 pts) (a) Li, Na, K K > Na > Li (b) Mg, Be, Ca Ca > Mg > Be (5 pts if correct, all or nothing) (c) Se, Se-, Se2- Se2- > Se- > Se (5 pts if correct, all or nothing) 2. Fill in the electrons in the valence level orbital diagrams below to provide a ground state electron configuration for each gas phase atom or ion that is consistent with the magnetic property given and label the valence s, d, and p shells with the correct principle quantum number. The first one is done as an example. (20 pts) Paramagnetic Br ↑↓ ↑↓ ↑↓ ↑↓ Paramagnetic Se € € ↑↓ € € ↑↓ ↑↓ ↑↓ ↑↓ € € ↑↓ ↑↓ € € ↑↓ ↑ 3d Paramagnetic Mo2+ € € € ↑ € ↑ ↑ 4p ↑↓ 4s € ↑↓ 3d 4s € ↑↓ ↑ 4p € ↑ € € € ↑ 5s 4d 5p 2 pts for correct quantum shell numbers, all or nothing. 8 points for correct electron configuration, all € nothing or € € € This was homework problem 8.61 in the book. 3. Identify each element from the given electron configuration for its neutral atom. Indicate the number of unpaired electrons in each. The first one is done as an example. (20 pts) This was homework problem 8.30 in the book. element Electron configuration # unpaired electrons P [Ne] 3s23p3 3 K (3 pts) S (3 pts) I (3 pts) Ni (3 pts) [Ar] 4s1 1 (2 pts) [Ne] 3s23p4 2 (2 pts) [Kr] 5s24d105p5 1 (2 pts) [Ar] 4s23d8 2 (2 pts) ...
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This note was uploaded on 11/16/2011 for the course CHEM 6A taught by Professor Pomeroy during the Spring '08 term at UCSD.

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