VSEPR and MO Theory
What is the purpose of the VSEPR model?
To identify the geometry of molecules and minimize the electron repulsions.
How many moles of compound are in 78.25 g of CO₂?
1.78 moles
Balance the following chemical equation: Cr + S₈ → Cr₂S₈.
2Cr + S₈ → Cr₂S₈
Which of the following products will produce a precipitate; Hg₂SO₄, KOH, HNO₃?
Hg₂SO₄
Assign oxidation numbers to each of the atoms in Ca(NO₃)₂.
Ca= +2
N= +5
O= -2
Predict the molecular geometry for the following molecule, including bond angles: TeF₄.
Tetrahedral, 109.5 degrees
How many hydrogen atoms are present in 76.45 g of ammonium sulfate?
2.79E24 atoms
How many moles of solid copper can be formed by the reaction of 4.59 g of CuO and 2.73 g of C in the following reaction? CuO + C → Cu + CO₂
0.058 moles Cu
What volume of 1.75 M HCl should be used to prepare a 3.5 L solution of 0.55 M HCL?
1.1 L
Identify the oxidizing and reducing agents in the redox reaction below. Cu + 2Ag⁺ → 2Ag + Cu²⁺
Reducing agent: Cu, Oxidizing agent: Ag⁺
Which of the following molecules contains a dipole moment? BF₃, CF₄, or NF₃
NF₃
A compound that contains only carbon, hydrogen, and oxygen is 48.64% C and 8.16% H by mass. What is the empirical formula of this substance?
C₃H₆O₂
Calculate the molarity of a 5.623 g sample of NaHCO₃ that is dissolved in water to create 250 mL of solution.
0.2677 M
Name three strong bases and three strong acids.
Strong acids: HCl, HBr, HI, HNO₃, H₂SO₄, HClO₄
Strong bases: LiOH, NaOH, KOH, Ca(OH)₂, Sr(OH)₂, Ba(OH)₂
Balance the following redox reaction: Zn + H₂SO₄ -> ZnSO₄ + H₂
Zn + H₂SO₄ -> ZnSO₄ + H₂
Name all of the hybrid orbitals and how many bonding groups they are associated with
Sp: 2 bonding groups, Sp²: 3 bonding groups, Sp³: 4 bonding groups, Dsp³: 5 bonding groups, D²sp³: 6 bonding groups
Which of the following compounds has a greater mass percent of carbon: C₁₂H₂₂O₁₁ or C₈H₁₀N₄O₂?
C₈H₁₀N₄O₂
Calculate the concentrations of all ions in 0.100 moles of Ca(NO₃)₂ in 100 mL of solution.
M Ca²⁺= 1.00 M, M NO₃⁻=2.00 M
A 25.00-mL sample of hydrochloric acid solution requires 24.16 mL of 0.106M sodium hydroxide for complete neutralization. What is the concentration of the original hydrochloric acid solution?
0.102 M
Balance the following redox reaction: PbO + NH₃→ N₂ + H₂O + Pb
3PbO + 2NH₃→ N₂ + 3H₂O + 3Pb
What is the bond order of XeF⁻? Is it paramagnetic or diamagnetic?
0, diamagnetic
A given sample of a xenon fluoride compound contains molecules of the type XeFₙ, where N is some whole number. Given that 9.033 x 10²⁰ molecules of XeFₙ weigh 0.368 g, determine the value for N in the formula.
6
DAILY DOUBLE
Basic
What volume of 0.0521 M Ba(OH)₂ is required to neutralize exactly 14.20 mL of 0.141 M H₃PO₄?
57.6 mL or 0.0576 L
Balance the following redox reaction in acidic/aqueous conditions: Cr₂O₇²⁻ + C₂H₅OH →Cr³⁺ + CO₂
16H⁺ + 2Cr₂O₇²⁻ + C₂H₅OH → 4Cr³⁺ + 2CO₂ + 11H₂O