chemistry

The Lewis structure of N₂O is shown on the left below with numbers on the corresponding atoms. Choose the correct set of formal charges of the atoms in ascending order of atom number.

#1 = 0, #2 = +1, #3 = -1

The Lewis structure of carbonate (CO₃²⁻) is shown on the left below. What is the formal charge of the highlighted atom?

-1

Based on the bond energies for the reaction below, what is the enthalpy of the reaction? H₂ (g) + N₂ (g) + 2 C (g) → 2 HCN (g)

-1223 kJ

Calculate the lattice energy for MgF₂(s) given the following information:

-2961 kJ/mol

Determine the number of valence electrons in cyanide (CN⁻) and then draw the corresponding Lewis structure. Please place the elements in the order that they are written.

10

Determine the number of valence electrons in N₂H₂ and then draw the corresponding Lewis structure.

12

Draw the Lewis structure of XeF₄ and then choose the appropriate number of valence electrons on the central atom.

12

Determine the number of valence electrons in SO₃ and then draw the corresponding Lewis structure (with minimized formal charges).

24

Determine the number of valence electrons in PCl₃ and then draw the corresponding Lewis structure.

26

Determine the number of valence electrons in SiF₄ and then draw the corresponding Lewis structure.

32

The bond dissociation energy to break 1 hydrogen-carbon bond(s) in 1 mol of HC≡CH molecules is

411 kJ

Draw the Lewis structure for sulfate (SO₄²⁻) with minimized formal charges. How many TOTAL likely resonance structures exist for SO₄²⁻?

6

Which of the following is the correct Lewis symbol for a neutral atom of Mg?

B) see problem image

Which one of the following is the correct set of Lewis Symbols for CaCl₂?

B) see problem image

Based on their positions in the periodic table, which of the following bonds is the most polar?

C - F

Which of the following is the correct Lewis symbol for a neutral atom of Al?

C) see problem image

Which of the following is the correct Lewis symbol for a neutral atom of O?

D) see problem image

A Lewis structure for SO₃ is shown below on the left. Predict whether bonding angle A will be equal to, greater than, or less than the ideal bonding angle according to the VSEPR model.

Equal

Which of the following bonds is a nonpolar covalent bond?

F - F

Which of the following bonds is a polar covalent bond?

H - Cl

Which of the following is an example of an ionic bond?

K - F

Draw the Lewis structure of CH₃F and then determine if the molecule is polar or nonpolar.

Polar

Draw the Lewis structure of PBr₃ and then determine if the molecule is polar or nonpolar.

Polar

Draw the Lewis structure of carbon monoxide (CO) and then determine if the molecule is polar or nonpolar. Please place the elements in the order that they are written.

Polar

Draw the Lewis structure of formaldehyde (H₂CO) and then determine if the molecule is polar or nonpolar.

Polar

Draw the Lewis structure of carbon dioxide (CO₂).

picture.

Single, double, or triple covalent bonds in a carbon atom are formed from

valence electrons

Draw the Lewis structure of CS₂ and then determine the number of nonbonding electron pairs on the central atom.

0

Draw the Lewis structure of ethyne (C₂H₂) and then choose the appropriate pair of molecular geometries of the two central atoms. Your answer choice is independent of the orientation of your drawn structure.

linear / linear

A Lewis structure for sulfate (SO₄²⁻) is shown below, however, its formal charges are not minimized. Starting from this structure, complete the correct structure with minimized formal charges.

picture.

Draw the Lewis structure of acetaldehyde (CH₃CHO) and then choose the appropriate pair of molecular geometries of the two central atoms. Your answer choice is independent of the orientation of your drawn structure.

tetrahedral / trigonal planar

Draw the Lewis structure of PF₅ and then determine its electron domain and molecular geometries.

trigonal bipyramidal / trigonal bipyramidal

The bond dissociation energy to break 2 bond(s) in 1 mole of CO₂ molecules is

1598 kJ

The Lewis structure for ethyne (C₂H₂) shown below is incorrect. Starting from this structure, complete the correct structure.

picture.

In a covalent bond A) two atoms exchange electrons and the ions are attracted to one another. B) two ions come together and form a crystal lattice. C) two atoms share valence electrons and those shared electrons form the chemical bond. D) two elements react and form a new compound.

two atoms share valence electrons and those shared electrons form the chemical bond.

Draw the Lewis structure of O₂.

picture.

The bond dissociation energy to break 4 bond(s) in 1 mole of CH₄ molecules is

1644 kJ

A Lewis structure for bromate (BrO₃⁻) is shown below, however, its formal charges are not minimized. Starting from this structure, complete the correct structure with minimized formal charges.

picture.

Which of the following substances contains MOSTLY ionic bonding?

LiF

A Lewis structure for the nitrate ion (NO₃⁻) is shown on the left below. Draw another equivalent resonance structure of NO₃⁻.

picture.

Draw the Lewis structure of ammonia (NH₃).

picture.

Draw the Lewis structure of formaldehyde (H₂CO).

picture.

Draw the Lewis structure of methane (CH₄)

picture.

Draw the Lewis structure of hydronium (H₃O⁺) and then determine its electron domain and molecular geometries.

tetrahedral / trigonal pyramidal

Draw the Lewis structure of BH₃ and then determine its electron domain and molecular geometries.

trigonal planar / trigonal planar