test_III_red - Name: Class: I Date: ID: IB CHEM 1211 Test...

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Unformatted text preview: Name: Class: I Date: ID: IB CHEM 1211 Test III Multiple Choice 7 t - Identify the letter of the choice that best completes the statement or answers the question. 1. Which of the following chemical equations does not correspond to a standard molar enthalpy of fonnation? a. H2(g) + 1/2 02(g) —.> H200) , b. Ca(s) + C(s) + 3/2 02(g) —-> CaC03(s) 0» N2(g) + 2 02(8) —> N204(g) 302(g) + 1/2 02c) a Sosa e. C(s)+ 1/2 02(g)->CO(S) 2. What is the maximum number of electrons that can occupy the n = 75 shell? a. 14 b. 10 c. _ 25 , so e. 5 3. The thermochemical equation for the combustion of hexane is shown heliow. CaHl4(g) + 19/2 01(g) —> 6 C02(g) + 7 H20(g) AH" = -4163 kl What is the enthalpy change for the combustion of 2.50 g Cal-114? a. —l.43 x 105 id , b. —1.04 x104kl ® -121 k] d. -3.59 x 105 k} e. -1.66 x 103 k]- __ 4. Which of the following atoms is diamagnetic? a. Cu ' ‘ b. C c. F e. Rh 5. Which of the following statements is CORRECT? a. If a reaction occurs at constant volume, w = AE. b. If a reaction occurs at constant volume, AE > AH. c. If a reaction occurs at constant pressure, q = NS. d. If a reaction occurs at constant pressure, w = AE. ® If a reaction occurs at constant pressure, :1 = AH. 6. Place the following atoms in order of increasing atomic radii: Se, 0, S, and As. 0 < S < Se < As ' b. O < S < As > Se c. As < Se < S < 0' - (1. Se < As < S < 0 e. S < As < O < Sc ' Name: ' 1]): B 7. Hund's rule states that the most stable arrangement of electrons (for a ground state electron configuration) a. has two electrons per orbital, each with identical spins. ' b. has a filled valence shell of electrons. , c. has two electrons per orbital, each with opposing spins. d. has m; values greater than or equal to zero. has the maximum number of unpaired electrons, all with the same spin. _ 8. A silicon atom has ____ valence electrons. 'a. 6 b. 2 c. 0 Q1) 4 e. 10 _. 9. Rank K, Li, and Cs in” order of increasing first ionization energy. a. K < Cs < Li ' 1:. Li < K < Cs c. Li < Cs.< K Cs < K < Li e. - Cs < Li < K Which of the following diagrams represent p-orbitals‘? (I) 01) (m) (N) a (11) only i . only c. (IV) only d. (Ill) only 7 e. (I) and (H) 11. A chemical reaction in a bomb calorimeter evolves 5.17 k3 of-heat. If the heat capacity of the calorimeter is 1.08 kJ/°C, what is the temperature change of the calorimeter?- ' a. 5.58 °c 4.79 T c. 6.25 0c d. 0.209 T e'. 409°C - 12. Which of the following statements is INCORRECT? a. Electrons have both wave and particle properties. b. The behavior of an atom‘s electrons can be described by standing waves. ' c. The energies of an atom's electrons are quantized. ® The location and the energy of an eleCtron in an atom can be simultaneously known with little or no uncertainty. e. Quantum numbers define the energy states and the orbitals available to an electron. Name: ‘ 1]): B 13. What is the total number of valence electrons in a carbonate ion? a. 22 b. 26 c. 30 24 e. 20 _ 14. Use VSEPR theory to predict the molecular geometry of H30+. a. linear b. trigonal-planar c. bent trigonal-pyramidal e. T-shaped 15. Which of the following elements is an s—block element? m @Cs 1). C c. Cd d. Cf 6. C1 16. The Schrodinger wave equation a is used to calculate the velocity of an electron. b incorrectly predicts circular orbits of electrons around nuclei. calculates the position and momentum of an electron at any given time. d proves that energy is equal to mass times the speed of light squared. can be solved to determine the probability of finding an electron in a region of space. c. 17. The Pauli exclusion principle states that _ electrons with opposing spins are attracted to each other. electrons can have either :t% spins. no two electrons in an atom can have the same spin. a. b. C. d. atoms with no unpaired electrons are diamagnetic. no two electrons in an atom can have the same four quantum numbers. 18. Which of the following sets of quantum numbers refers to a 4p orbital? ‘ n=4,l=l,m;=0 . "=4,l=2,m[=- c. n=l,l=2,ny=- d._ n=4,l=3,m;=+2 e. n=.l,l=l,m;=- 19. Which of the following elements is most likely to form a molecular structure that disobeys the octet rule? Name: . 7 ID: B 20. Which of the following properties is associated with the value of the I quantum number? a. the energy of an orbital b. the number of electrons in an orbital c. r the orientation in space of an orbital _ d. the size of an orbital the shape of an orbital 21. What type of orbital is'designated n = 3, 1= 2, m;= —l? a. 3p b. 2d @ 3d d. 2f e. 35 22. How many lone-pair electrons are on the carbon atom in C02? 3.. 2 b. 4 c. 1 d. 3 0 . 23. Which element has the electron configuration 1s22322p‘3323p“? a. Se 13. Mg _ 0. Si (1. Ga 5 24. What shell contains a total of 9 orbitals? m n=3 4 2 5 1 II b. n c. n d. n n e. 25. Iftwo or more species have the same number of electrons resulting in similar Lewis structures, they are said to be ‘ , a. symmetric iso'electronic c. resonant structures d. covalent e neutral Test 111 - B (5 points) Give the grounds state electron configurations for the following atoms: Arsenic (As) 1529 39" 3: 3.0% 31%? ’9 [Air 4.» MWF’ Rubidium (Rb) 15" 25‘ a0" 3:” V 75" Mp?" 5" 2 [Kr—J 55’ (10 points) Give the Lewis structul'e for the following molecules or ions: NH: i u—v AM} i )J SF5 ‘- -— ,p; _. I 2 -F\I /—E (10 points) Determine the enthalpy change for the following reaction: . ' P4(S) + 6 C12(g) 9 4 PC1140) r I Using the following data: P4(s) + 10 C12(g) —) 4PCls(s) AH°=-1774.0kJ ,m L! ( PC13(1) + C12(g) —) PC1568 AH°=-123.8kJ V . .4” p965) l IDU’JQ"? ('1 P050) “1774.0 (<3 L/( pCPS—(sj»—> £30356) 1' CDJfi) -§/(u/33‘g )5) I 7 AN ‘07 7— ’Dwi— “'9 (iow “7779.016? was. »-——-=P 9ij r em: I ,1, 495. 1210' F; kwq [MI—Poga achvgr ya; 4% Bi 4‘ (owl #9 LIPCP3 -12 733K5- // ...
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test_III_red - Name: Class: I Date: ID: IB CHEM 1211 Test...

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