Molecular Geometry and Lewis Structures Quiz

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Questions and Answers

Draw the Lewis structure for CO.

The most stable structure for CO (carbon monoxide) allows for the octet of each atom to be complete without introducing a formal charge.

A molecule with the formula AB3 has a trigonal planar geometry. How many electron groups are on the central atom?

3 (correct)

Determine the electron geometry for each molecule: CS2, SBr2, CHCl3, PF3

Linear: CS2, Tetrahedral: SBr2, CHCl3, PF3

Determine the molecular geometry of SCl4. Choose the correct sketch of SCl4.

seesaw Signup and view all the answers

Make a sketch of the following molecule: C2H2. Determine the molecular geometry about each interior carbon atom of this molecule.

linear Signup and view all the answers

Determine whether each of the following molecules or ions is polar or nonpolar: SCl2, PO4^3-, IF5

nonpolar Signup and view all the answers

The valence electron configurations of several atoms are shown. How many bonds can each atom make without hybridization?

Si: 2 bonds, P: 3 bonds, S: 2 bonds Signup and view all the answers

Which of the following hybridization schemes allows the formation of at least one π bond?

sp^2 Signup and view all the answers

Draw the Lewis structure for the CCl4. Select the correct hybridization for the central atom based on the electron geometry CCl4.

sp^3 Signup and view all the answers

Use the drawing of MO energy diagram to predict the bond order of Be2+. Use the drawing of MO energy diagram to predict the bond order of Be2−.

1/2 Signup and view all the answers

According to MO theory, which of the following has the highest bond order?

C2- Signup and view all the answers

Use the drawing of MO energy diagram for CO to predict the bond order.

3 Signup and view all the answers

Classify each of the following changes as physical or chemical.

Physical Change: liquid propane in a gas grill evaporates because the valve was left open. Chemical Change: natural gas burns in stove Signup and view all the answers

Classify each of the following properties as physical or chemical.

Chemical Signup and view all the answers

Write a balanced chemical equation for the reaction: sulfuric acid is a component of acid rain formed when gaseous sulfur dioxide pollutant reacts with gaseous oxygen and liquid water to form aqueous sulfuric acid.

2SO2(g)+O2(g)+2H2O(l)→2H2SO4(aq) Signup and view all the answers

Study Notes

Lewis Structures and Molecular Geometry

Carbon monoxide (CO) has a Lewis structure with a total of 10 electrons, enabling both atoms to complete their octets, resulting in formal charges.
Molecule AB3 exhibits trigonal planar geometry with 3 electron groups around the central atom.

Molecular and Electron Geometry

For CS2: Linear molecular and electron geometry with 180° bond angles.
For SBr2: Bent molecular geometry, tetrahedral electron geometry, and idealized bond angles of approximately 109.5°.
PF3 exhibits trigonal pyramidal molecular geometry and tetrahedral electron geometry with expected deviations from idealized angles.

Specific Molecular Geometries

SCl4 exhibits seesaw molecular geometry.
ClF3 has a T-shaped geometry.
BrF2− displays linear molecular geometry.
ClF4− is square planar in structure.

Hydrocarbon Geometries

C2H2 is linear, C2H4 is trigonal planar, and C2H6 is tetrahedral around each carbon atom.

Polarity of Molecules

SCl2 and IF5 are polar, while PO4^3− is nonpolar.

Valence Electrons and Bonding

Silicon (Si) can form 2 bonds without hybridization, phosphorus (P) can form 3, and sulfur (S) can form 2.
Hybridization sp^2 enables the formation of π bonds.

Lewis Structures and Hybridization

CCl4 has sp^3 hybridization; NH3, OF2, and CO2 also correspond to sp^3 and sp hybridization, respectively.
COCl2 has sp^2 hybridization, and BrF5 has sp^3d^2 hybridization.

Nitrogen-Based Compounds

Lewis structure for N2H2 indicates sp^2 hybridization on both nitrogen atoms.
In N2H4, both nitrogen atoms are sp^3 hybridized.
CH3NH2 has carbon atom sp^3 and nitrogen atom sp^3 hybridization.

Amino Acids and Hybridization

Alanine's interior atoms show varying hybridization configurations: sp^2 and sp^3.

Molecular Orbital (MO) Theory

Be2+ and Be2− have a predicted bond order of 1/2.
Species Be2+, Be2− are predicted to exist in the gas phase.
C2 has the highest bond order among C2, C+2, and C−2.

Chemical Reactions and Equations

Balanced equation for acid rain: 2SO2(g) + O2(g) + 2H2O(l) → 2H2SO4(aq).
Sodium reacts with water: 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g).
Aqueous sodium sulfide reacts with copper(II) nitrate to form solid copper(II) sulfide.
Reactions involving cobalt(III) oxide and various acids are provided with balanced equations.

Changes in Matter

Physical changes involve state changes like liquid evaporation, while chemical changes include combustion and rusting.
Properties such as shine and odor are classified as physical, while flammability is chemical.

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Description

Test your knowledge on Lewis structures and the various geometries of molecules. This quiz covers topics such as molecular and electron geometries, including specific examples like CO, CS2, and C2H6. Assess your understanding of the shapes and polarities of different molecular compounds.