Chem 101 Chap 7 study guide
Which atom in the Br-F molecule has a partial negative charge (δ⁻)?
A) F
Which of the following substances contains MOSTLY ionic bonding?
A) LiF
Which one of the following trends appears when considering lattice energies?
A) The higher the charge on the ions, the higher the lattice energy.
Xenon is a noble gas that is capable of forming compounds. One of these compounds is XeBr₂Cl₂. If the molecule has a octahedral geometry and only 4 bonding domains, what is the molecular geometry (shape) for XeBr₂Cl₂?
A) square planar (X-shape)
The reason an ionic bond forms can best be described as
A) the energy change for electron transfer results in a large gain in stability when the ionic bond forms.
Water is a polar molecule because
A) water is a bent molecule and oxygen is more electronegative than hydrogen.
A lattice energy is
B) the amount of energy that must be supplied to break an ionic solid into its individual gaseous ions.
Single, double, or triple covalent bonds in a carbon atom are formed from
B) valence electrons.
Xenon is a noble gas that is capable of forming compounds. One of these compounds is XeBr₂Cl₂. Is the molecule polar?
C) Depending on how the atoms are connected, the molecule can be polar or nonpolar.
A bond dissociation energy is
C) The energy required to break a covalent bond.
In a covalent bond
C) two atoms share valence electrons and those shared electrons form the chemical bond.
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.
E) #1 = 0, #2 = +1, #3 = -1
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 is an ionic bond because the difference in electronegativity is greater than 1.5 and it is between a metal and a nonmetal.
A Lewis structure for the hydronium ion (H₃O⁺) 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. Correct!
Less than
Which of the following ionic compounds has the largest lattice energy; that is, which has the lattice energy most favorable to a stable lattice?
MgO
A Lewis structure with placeholder elements is shown below. If the formal charge of the central atom is 0, choose the possible identities of the central atom.
S or Se
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)
-1222
Calculate the lattice energy for MgF₂(s) given the following information:
-2961
Determine the number of valence electrons in acetone (CH₃C(O)CH₃) and then draw the corresponding Lewis structure.
24
Xenon is a noble gas that is capable of forming compounds. One of these compounds is XeBr₂Cl₂. What is the total number of valence electrons in the molecule?
36
Draw the Lewis structure for sulfate (SO₄²⁻) with minimized formal charges. How many TOTAL likely resonance structures exist for SO₄²⁻?
6
Xenon is a noble gas that is capable of forming compounds. One of these compounds is XeBr₂Cl₂. Use your Lewis structure from part b. How many electron domains are on the central atom?
6
Which of the following is the correct Lewis symbol for a neutral atom of Al?
A neutral atom of Al has 3 valence electrons. Al with 3 dots.
Which of the following is the correct Lewis symbol for a neutral atom of O?
A neutral atom of O has 6 valence electrons.
