Chemistry Lesson 5 examination study guide 2022, Exams of Nursing

Download Chemistry Lesson 5 examination study guide 2022 and more Exams Nursing in PDF only on Docsity! LESSON 5 QUIZ Question 1 of 25 4.0/ 4.0 Points Each of the three resonance structures of NO3 – has how many lone pairs of electrons? A. 8 B. 10 C. 13 D. 7 E. 9 Feedback: See Chapter 8 Question 2 of 25 4.0/ 4.0 Points When comparing Be2 and H2: I. Be2 is more stable because it contains both bonding and antibonding valence electrons. II. H2 has a higher bond order than Be2. III. H2 is more stable because it only contains 1s electrons. IV. H2 is more stable because it is diamagnetic, whereas Be2 is paramagnetic. A. II, III B. III, IV C. I, II D. II, III, IV E. III only Feedback: See Chapter 8 Question 3 of 25 4.0/ 4.0 Points Nitrous oxide (N2O) is sometimes called “laughing gas”. What is the formal charge on the central nitrogen atom in the most favorable Lewis structure for nitrous oxide based on minimizing formal charge overall? The atom connectivity is N–N–O. A. +2 B. +1 C. -2 D. -1 This study source was downloaded by 100000838393008 from CourseHero.com on 10-29-2022 14:04:04 GMT -05:00 https://www.coursehero.com/file/32632580/CHEM-LESSON-5-QUIZdocx/ E. 0 Feedback: See Chapter 8 Question 4 of 25 0.0/ 4.0 Points What is the bond order of He2 +? A. 1.0 B. 1.5 C. 0.0 D. 0.5 E. 2.0 Feedback: See Chapter 8 Question 5 of 25 4.0/ 4.0 Points BeF4 2– is called the fluoberyllate ion. The formal charge on the beryllium atom in this ion is A. -2 B. -1 C. +2 D. +1 E. 0 Feedback: See Chapter 8 Question 6 of 25 0.0/ 4.0 Points The configuration (σ2s)2(σ2s*)2(π2p)2 is the molecular orbital electron configuration for the ground state of: A. Be2 B. C2 C. B2 2– D. Li2 + E. B2 Feedback: See Chapter 8 Question 7 of 25 4.0/ 4.0 Points How many double and single bonds are in the resonance form for SO2 in which the formal charges on each atom are zero? This study source was downloaded by 100000838393008 from CourseHero.com on 10-29-2022 14:04:04 GMT -05:00 https://www.coursehero.com/file/32632580/CHEM-LESSON-5-QUIZdocx/ Feedback: Compounds likely to be soluble in solvents are of similar polarities; "like dissolve like". Question 15 of 25 4.0/ 4.0 Points Geometrically trigonal planar means that the electron groups have what angle? A. 90° B. 120° C. 180° D. 109.5° Feedback: VSEPR theory predicts molecular geometry by minimizing electrostatic repulsion of the valence electrons around a central atom. Question 16 of 25 4.0/ 4.0 Points We learned in this lesson that there are different types of bonds based on electronegativity. One bond type is known as non-polar covalent. Which choice below has this bond type? A. NaCl B. H2O C. all of the compounds D. H2 Feedback: Covalent bonds typically occur between two nonmetals whereas ionic bonds typically occur between a metal and a nonmetal. Question 17 of 25 4.0/ 4.0 Points When we consider that within a bond, the charge can be located on opposite ends of the bond, which term below best describes that? A. polar covalent B. coulombic attraction C. electronegativity D. dipole moment E. nonpolar covalent Feedback: Polarity is also determined by the shape of a molecule. Molecules that are symmetrical tend to be nonpolar. Molecules that are asymmetrical tend to be polar. Question 18 of 25 4.0/ 4.0 Points Regarding Lewis structures, which of these is NOT a true statement? This study source was downloaded by 100000838393008 from CourseHero.com on 10-29-2022 14:04:04 GMT -05:00 https://www.coursehero.com/file/32632580/CHEM-LESSON-5-QUIZdocx/ A. transferring electrons is called ionic bonding B. 8 electrons in the valance shell is known as an octet C. the sharing of electrons is called covalent bonding D. He is stable with just a duet of electrons E. All of the above statements are true. Feedback: Lewis dot structures are diagrams that show the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule. Question 19 of 25 4.0/ 4.0 Points Geometrically tetrahedral means that the electron groups have what angle? A. 109.5° B. 90° C. 180° D. 120° Feedback: VSEPR theory predicts molecular geometry by minimizing electrostatic repulsion of the valence electrons around a central atom. Question 20 of 25 4.0/ 4.0 Points Draw the Lewis structure for the carbonate polyatomic ion. How many valence electrons does it have? A. 26 B. 24 C. 23 D. 18 E. 22 Feedback: Lewis dot structures are diagrams that show the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule. Question 21 of 25 4.0/ 4.0 Points Use Lewis theory to draw the structure of the compound containing 1 carbon and 4 chlorine atoms. What would you find surrounding the central atom of this ion? A. 1 triple bond. B. 1 double bond. C. 2 double bonds. D. no double bonds. This study source was downloaded by 100000838393008 from CourseHero.com on 10-29-2022 14:04:04 GMT -05:00 https://www.coursehero.com/file/32632580/CHEM-LESSON-5-QUIZdocx/ Feedback: Lewis dot structures are diagrams that show the bonding between atoms of a molecule and the lone pairs of electrons that may exist in the molecule. Question 22 of 25 0.0/ 4.0 Points What is the electronic geometry around the central atom of the ammonium ion according to VSEPR theory? A. bent B. trigonal pyramidal C. tetrahedral D. linear Feedback: VESPR theory predicts molecular geometry by minimizing electrostatic repulsion of the valence electrons around a central atom. Question 23 of 25 4.0/ 4.0 Points If the center atom has three groups of electrons around it, what type of electron geometry is present? A. tetrahedral B. trigonal planar C. trigonal bipyramidal D. linear Feedback: VSEPR theory predicts molecular geometry by minimizing electrostatic repulsion of the valence electrons around a central atom. Question 24 of 25 4.0/ 4.0 Points In this lesson we discuss the difference between polar and nonpolar molecules, and how to use Lewis structures and geometry to determine the polarity. One, all, or none of these compounds below are polar. Which one(s)? A. NH4 + B. none of these are polar C. Cl2O D. all of these are polar E. SiCl4 Feedback: Polarity is also determined by the shape of a molecule. Molecules that are symmetrical tend to be nonpolar. Molecules that are asymmetrical tend to be polar. Question 25 of 25 4.0/ 4.0 Points This study source was downloaded by 100000838393008 from CourseHero.com on 10-29-2022 14:04:04 GMT -05:00 https://www.coursehero.com/file/32632580/CHEM-LESSON-5-QUIZdocx/