Chemistry 122 Exam 2 Fall 2023

• Exam 2 is for Chemistry 122, Fall 2023, and it took place on October 17, 2023.
• Questions 1-17 are graded by Akindi on the bubble sheet and are worth 42.5 points.
• The total possible points for the exam is 67.5.

Instructions

• Cell phones are not allowed outside of your backpack and backpacks should be put at the front or back of the room.
• Only analog watches are allowed, and they must be taken off if they are not analog.
• Only simple scientific calculators are allowed.
• Calculators are not allowed to have internet capabilities.
• The signature sheet must be signed when you turn in the exam.

Multiple Choice

• A salt with the chemical formula X3(PO4)2, X belongs to Group 1A.
• The valence shell electron configuration expected to form an anion is ns2np5.
• An element with the ground-state electron configuration [Kr]5s14d10 is Silver (Ag).
• Sr2+ is isoelectronic with Kr.
• The electron configuration [Ar]3d10 represents Zn2+.
• Arranging C-O bond lengths from shortest to longest: CO < CO2 < CO32-.
• The approximate bond angles a, b, and c in the given molecule are 109.5°, 120°, and 109.5°, respectively.
• The molecular geometry of the carbon centered on bond angle b in the described structure is Linear.
• HCl is a polar bond, with higher electron density around the Cl atom.
• SO2 has a molecular geometry different from its electron geometry.
• A molecule or ion with four bonding domains and one lone pair has a see-saw molecular geometry.
• The charge of iron in FeCO3 is +2.
• The name for a compound with the formula Ca3N2 is Tricalcium dinitride.
• The ion NO2+ has 16 valence electrons.
• The species that is/are linear is I. CO2 and III. BeH2.
• XeF2 has a central atom violating the octet rule.
• S-S is the least polar bond.

Free Response

• Correct number of significant figures required, show work to receive credit.

Electron Configuration

• The full electron configuration for Fe2+ needs to be provided.
• The noble gas notation for Sn needs to be provided.
• The full electron configuration for Cu needs to be provided.

Orbital Box Diagram

• The orbital box diagram for the electron configuration of oxygen needs to be completed, including boxes for 1s, 2s, and 2p orbitals.
• Ions radius order from smallest to largest: Cs+, Xe, and I.
• Equations that show the first two ionizations of a gaseous aluminum atom.
• Lewis dot structures for thiocyanate ion (SCN) needs to be given as well as the formal charge for each atom in each structure and indicate which is most favorable based on formal charge.
• Lewis dot structures for the following molecules or ions: AsF6, NO2, SF4.
• Given the Lewis dot structures, fill in the tables accordingly including Electron Domain Geometry, Molecular Domain Geometry, Bond Angle(s) and if polar or nonpolar.
• Name or provide the formula for various chemical compounds.
• Arrange elements Al, Mg, and O in increasing order of atomic radius (smallest to largest)
• Arrange elements Al, Mg, and O in increasing negativity first electron affinity (less negative to more negative).
• List one elements that qualifies under each of the following categories: Metal, Metalloid, Transition Metal, Halogen, Noble gas, and a Non-metal.