Chemistry Exam 4 Study Guide
Chemistry Exam 4 Study Guide CHE 106 - M001
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CHE 106 - M001
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This 6 page Study Guide was uploaded by Andrea Scota on Sunday November 29, 2015. The Study Guide belongs to CHE 106 - M001 at Syracuse University taught by R. Doyle in Fall 2015. Since its upload, it has received 73 views. For similar materials see General Chemistry Lecture I in Chemistry at Syracuse University.
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Date Created: 11/29/15
Chem Exam 4 Study Guide Chapters 7 8 and 9 30 multiple choice questions 1 An electron in the highest occupied energy level of an atom is called an a Outer electron b Valence electron c Bonding electron d Lone electron 2 True or false The effective nuclear charge of an atom depends on the screening of core electrons and on electronelectron repulsions a True b False 3 Which of the following elements has the greatest effective nuclear charge Li Ra As P O a Li b O c P d As 4 Cations are than their parent atoms because a Smaller electrons are added to their valence shells b Larger electrons are added to their valence shells c Larger electrons are taken from their valence shells d Smaller electrons are taken from their valence shells 5 Which of the following atoms has the largest bonding atomic radius a F b At c Mg d Ca 6 Ionization energy is a The energy required to crystalize an atom b The energy of a single atom c The minimum energy required to remove an electron from an atom at its ground state d The maximum energy required to remove an electron from an atom at its ground state 7 True or false Each time you remove an electron from at atom it becomes easier to remove the next electron from the atom a True b False 8 Which atom has the highest ionization energy Cl Br Sb Na a Cl b Br c Sb d Na 9 Electron affinity is a b C d 10 The energy required to remove one electron from an atom The energy change upon adding an electron to an atom The willingness of an atom to accept an electron Both B and C are correct You are given an unknown element and asked to categorize it as a metal a metalloid or a nonmetal Through observation and experiments you know the element is a solid a good conductor of heat be 9065 11 F7 12 13 and reacts with acid to form salt and water The element must Nonmetal Metalloid Metal The answer cannot be determined with the information provided Ionic bonds Are those formed by sharing electrons Are those formed by electrons that are relatively free to move throughout metals Are those formed by the transfer of electrons from one atom to another Are very weak True or false the formation of ionic compounds is endothermic a True b False True or false Lattice energy increases with the increasing size of ions and decreases with decreasing size of ions a b 14 16 True False Covalent bonds a Are those formed by sharing electrons b Are those formed by electrons that are relatively free to move throughout metals Are those formed by the transfer of electrons from one atom to another Are very strong Which of the following statements about electronegativity is Electronegativity is the ability of an atom in a molecule to attract electron density towards itself The numerical values for electronegativity have no units Electronegativity is the same thing as electron affinity Fluorine is the most electronegative element True or false The greater the electronegative difference in a molecule the more nonpolar the bond a b True False 17 A polar molecule is A molecule that whose atoms are shared equally A molecule in which electrons are taken from one atom and given to another A molecule that has no special properties A molecule that has a distinctly positive and negative side 18 When two atoms share electrons unequally it forms a Nonpolar bond Shift in atoms within the molecules A bond dipole Ionic bond 19 These Lewis structures of a nitrate ion are OO O O O O W 6 ITI 6 lell 0 O O Resonance structures Unequal Each different in how they react The same 20 Using table 84 in your textbook estimate AH for the reaction H2g Br2l gt 2HBrg 32 1 kJ 103 kJ 103 kJ 321 kJ 21 True or false Boron compounds are frequent exceptions to the octet rule because they have too few electrons surrounding the boron a True b False 22 True or false The Si in SiH4 does not follow the octet rule because hydrogen is in an unusual oxidation state a True b False 23 An AB2 molecule is described as linear and the A B bond length is known Does this information completely describe the geometry of the molecule a There isn t enough information to fully determine the molecular geometry b No c Yes 24 In which of these molecules or ions does the presence of nonbonding electron pairs produce an effect on molecular shape a b PE 90 65 9065 90 tr new C HBr d 80 e Both B and D are correct 25 What is the electron domain and molecular geometry of a P136 molecule a Linear linear b Tetrahedral trigonal pyramidal c Trigonal bipyramidal trigonal pyramidal d Octahedral octahedral 26 True or false Dipole moments and bond dipoles are the same thing a True b False 27 Indicate the hybridization of the central atom in AlCl4 Sp sp2 sp3 None of these answers are correct 28 True or false The VSEPR theory states that the repulsion between electron pairs causes molecular shapes to adjust so that the valenceelectron pairs stay as far apart as they can from the unshared P PFTP pairs a True b False 29 When is a sigma bond formed a When two atomic orbitals combine to form a molecular orbital that is symmetrical around the axis connecting the two atomic nuclei b When 2 atomic orbitals combine When p orbitals overlap When two atomic orbitals combine to form a molecular orbital in which the electron density lies above and below the internuclear was 30 A triple bond has how many sigma and pi bonds One one One two One none One three as 9065 ANSWER KEY 1 B 2 A 3 B 4 D 5 D 6 C 7 B 8 A 9 D 10 11 12 13 14 15 16 17 18 19 20 21 22 WDgtUDgtOUWUDgtDgtWOO 23 24 25 26 27 28 29 30 WDgtDgtOWUFHO
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