Chemistry: IMF Forces Test Review
What are the measurements?
1 atm = 760 mmHg, 760 Torr, 101.3 kPa
Kinetic Molecular Theory
1) Gas particles occupy empty space 2) Movement in straight lines 3) No force of attraction with container or other particles 4) Elastic collisions: no loss of kinetic energy 5) Temperature depends on average kinetic energy 6) At a given temperature, all gases have the same average kinetic energy
What are adhesive forces?
A similar thing to a different thing
What letters on the heating curve represents phase changes of H2O?
B,C,D
Why are hydrogen bonds strong in water?
Because it is polar
What is sublimation?
Change in state from a gas to a solid
Which one is weaker, cohesive or adhesive?
Cohesive
How do cohesive forces act with adhesive forces?
Cohesive forces do not interrupt adhesive forces
What is the difference in the heat of vapor or vaporization on the heating curve?
D = heat of vaporization, E = heating water vapor
Because of heat and temperature as surface area increases, what happens to the surface tension?
Decreases
What causes the surface tension of water to decrease?
Detergent
How are pressure and temperature related?
Directly proportional
What is the Strength of IMF Forces?
Dispersion (weakest), Dipole-Dipole, Hydrogen Bonding (strong)
Why is the structure of ice the way it is?
Due to the number of bonds
What are the endothermic and exothermic properties?
Endo: Sublimation, Melting, Vaporization, Exo: Deposition, Freezing, Condensation
What is the difference between Endo and Exo?
Endothermic = absorb energy, Exothermic = release energy
What state of matter is very compressible?
Gases
What is an example of an extremely viscous thing?
Glucose and molasses
What is the heat of B on the heating curve?
Heat of fusion
Why is the melting point of water high?
Hydrogen Bonding
What are the strongest bonds in IMF forces? What is there viscosity?
Hydrogen bonds, more viscous
As boiling point increases, what happens to pressure?
Increases
As vapor pressure increases, what happens to temperature?
Increases
What are three things that vapor pressure is influenced by?
Influenced by surface area, Intermolecular forces, and temperature
Intra vs. Inter MF?
Intra: bonding forces Inter: Non-bonding forces
How do vaporization and boiling point relate?
Inversely proportional
What type of force is MgO2?
Ionic
What type of force is NaCl?
Ionic
As temperature goes down as molecules move closer together...what happens to pressure?
It decreases or goes down
What is the melting point based on?
Mass (low mass is low melting point, high mass is high melting point)
What does a low melting point mean in terms of polarity?
Non-polar
When a substance is boiling, vaporization and condensation what is the rate of vaporization?
Same rate of vaporization
What are cohesive forces?
Same thing to same thing
What is the difference in the melting point for melting and freezing a liquid?
Samw
What has high surface tension?
Water has highest surface tension
What is the IMF force when there is a phase change from a solid to gas?
Weak IMF forces
When does a paper towel absorb water?
When cohesive forces are weaker than adhesive forces
When will anything boil?
When there is enough kinetic energy
What is the definition of vapor pressure?
atmospheric pressure (atm)
More gas particles causes what to happen to pressure
higher or increased