Intermolecular Forces and Properties
What is the energy change called that occurs when a chemical bond is formed?
Exothermic
Kinetic energy
Endothermic
Activation energy
What effect would increasing temperature have on saturation level?
At higher temperatures, saturation concentration universally declines for all types of solutions.
Temperature has no influence over gaseous solutions but affects liquids exclusively.
Saturation concentration remains constant regardless of temperature changes.
It tends to increase saturation concentration for most solid solutes but decrease gas solubility.
When comparing two liquids, one being an unsaturated hydrocarbon and the other a halogenated hydrocarbon containing the same number of carbons, which one would you predict to have a high evaporation rate under identical conditions?
Molecules structurally similar with atomic charge distribution resulting in nearly equal rates of evaporation
The unsaturated hydrocarbon due to less effective London dispersion forces than those present in the halogenated counterpart
The halogenated hydrocarbon since polarizability of atoms increases strength of dispersion forces between molecules
Both liquids will evaporate similarly fast because their molecular mass impacting volatility
Which of the following substances would have the highest boiling point, assuming all are at standard atmospheric pressure?
London dispersion force dominant liquid, such as bromine (Br2)
Dipole-dipole interacting liquid, such as chloroform (CHCl3)
Hydrogen bond forming liquid, such as water (H2O)
Nonpolar molecular solid, such as iodine (I2)
If water is the solvent in an aqueous solution, what most likely stays constant when more salt is dissolved?
The density of the water since it becomes less dense with more dissolved salt.
The boiling point remains static as it will not shift until salting-out occurs.
The mass of water specifically allocated to solvating each ion of salt.
The intrinsic hydrogen bonding between water molecules.
Why does road salt (typically NaCl or CaCl₂) effectively lower the freezing point of water on icy roads during winter months?
It absorbs heat from surroundings raising roads' temperature above freezing point.
It chemically reacts with ice forming compounds that melt at higher temperatures than pure ice.
It disrupts hydrogen bonding between water molecules, lowering its freezing temperature (freezing point depression).
Salt provides nucleation points for ice crystals preventing their formation even below normal freezing point of water.
How many solute particles are in 100.0 mL of a 0.100 M NaCl solution?
1.20 x 10^22 particles
0.100 particles
6.02 x 10^23 particles
6.02 x 10^21 particles

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Considering Le Chatelier's Principle, what happens when salt is added into saturated solution?
More solvent molecules interact with salt ions, quickly dissolving additional salt.
No new salt dissolves, the added amount settles out.
Salt concentration decreases causing more solvent particles to evaporate.
Added salt immediately precipitates without interacting with solution.
When NaCl dissolves in water, aqueous Na+ and Cl- form. The attraction between Na+ and water is called a ____?
LDF
dipole-dipole
ion-dipole
hydrogen bond
How would you classify a mixture with uniform composition throughout?
Composite material
Chemical compound
Homogeneous mixture
Heterogeneous mixture