IMF
What IMF exist in Formaldehyde? (CH2O)
LDF, DDF
Which has the stronger lattice energy, Gallium Phosphide (GaP) or Potassium Bromide (KBr)?
GaP
Is Sodium Chloride (NaCl(s)) soluble (miscible) in water (H2O(l))? Why?
Yes, because the experience Ion-Dipole attractions between each other.
Is melting exo or endo thermic?
Draw the Lewis structure for SO3
(response on paper)
What IMF exist in Ozone (O3)?
LDF, DDF
Which has the stronger lattice energy, Sodium Phosphate (Na3PO4) or Lithium Nitrate (LiNO3)?
Na3PO4
Is Elemental Iodine (I2(s))soluble (miscible) in Benzene (C6H6)? Why?
Yes, because their only IMF's are LDF for both compounds.
Suppose we have a bottle containing 200 grams of hexane (molar mass = 86.18 g/mol) at room temperature (20oC).
Assuming a standard atmospheric pressure of 1 atm, where the specific heat of liquid hexane is 2.27 J/(g*oC), its boiling point at 68.7oC gas hexane's specific heat is 1.65 J/(g*oC), & the ΔHovap of hexane is 28.9 kJ/mol, how much heat energy would be needed to heat the hexane to 100oC?
ΔT1 = (68.7 - 20)
q1 = 200*2.27*ΔT1
q2 = 28.9*(200/86.18)
ΔT2 = (100 - 68.7)
q3 = 200*1.65*ΔT2
qtot = q1 + q2 + q3
Are resonance structures ever observed in nature? Why?
They themselves are never observed, because they come together to form a hybrid structure in reality.
What IMF exist in Iron metal (Fe)?
LDF, Metallic Bonding
Rank the following ionic compounds based on the strength of their lattice energy, from the weakest to the strongest: Iron (III) Oxide (Fe2O3), Sodium Hypochlorite (NaClO), Zinc (II) Oxide (ZnO), Aluminum Nitride (AlN)
NaClO, ZnO, Fe2O3, AlN
Is Vitamin D soluble (miscible) in water (H2O(l))? Why?
Vitamin D is insoluble (immiscible) in water due to Vitamin D having virtually no Hydrogen Bonding or DDF, therefore being unlike water in its IMF.
What is the name of the physical change of a solid going to a gas? Is it endothermic or exothermic?
sublimation, endothermic
What is the electron configuration of elemental Phosphorous (P)?
[Ne]3s23p3 or 1s22s22p63s23p3
What IMF exist in Cyclohexane?
LDF
Rank the following ionic compounds based off of their lattice energy from the weakest to the strongest: Sodium Acetate (CH3COONa), Iron (III) Phosphate (FePO4), Magnesium Sulfate (MgSO4)
CH3COONa, MgSO4, FePO4,
Is Vitamin C soluble (miscible) in fat? Why?
Vitamin C is insoluble (immiscible) in fat. This is because fat has little to no DDF or Hydrogen bonding, & that is the primary IMF of Vitamin C.
N-butane & tert-butane have the same chemical formula: (C4H10), but they have different structures. N-butane is a long chain, while tert-butane is a more condensed molecule. Which of the 2 will have a higher boiling point? Why?
N-butane will have the higher boiling point, because it has a larger surface area, allowing it to stack easier & it gives it a larger surface area.
What IMF exist in a saline mixture? (NaCl + H2O)
LDF, Hydrogen Bonding, IDF, (Some ionic bonding in the salt itself)
Rank the following ionic compounds based on their lattice energy, from strongest to weakest: Sodium Formate (HCOONa), Potassium Acetate (CH3COOK), Rubidium Propanoate (CH3CH2COORb), Caesium Butyrate (CH3CH2CH2COOCs)
HCOONa, CH3COOK, CH3CH2COORb, CH3CH2CH2COOCs
Is Acetaldehyde (CH3CHO) soluble in Cyclohexane (C6H12)? Why?
Yes, and this is because Acetaldehyde has a prevalent non-polar portion of it's molecule, meaning that this portion of Acetaldehyde only has LDF as its IMF. Cyclohexane also only has IMF.
Gases and Liquids have similar physical properties, but they are not entirely alike. What are some differences between them physically?
Gases are compressible while liquids are not. Liquids do not assume the volume of the container, and they do not expand to fill the container, though they do assume the shape. Liquids also do not diffuse nearly as quickly as gases do.