I'm....Changing
What phase change occurs when a substance goes from liquid to solid?
Freezing
What is the strongest intermolecular force?
Hydrogen Bonds
What state of matter has the most kinetic energy?
Gas
What 2 things do you need for a hydrogen bond?
Hydrogen and a very electronegative atom
What is boiling point?
No, the same force but it's strength varies
What state of matter has the strongest intermolecular force strength and lowest kinetic energy
in the penny test we did last class which substance held more drops....
Water
What is sublimation.....
When a substance with very weak intermolecular forces goes DIRECTLY from solid to gas
As kinetic energy increases what happens the strength of the intermolecular force?
It weakens and is unable to hold the molecules together
Why don't gasses have any intermolecular forces?
They have to much kinetic energy and the molecules are spread out to far.
What 2 factors influence gas pressure?
volume and temperature
What phase changes are a result of a substance losing heat (3 options)
condensation, freezing, and deposition
Rank the intermolecular forces from weakest to strongest
dispersion force, dipole interaction, hydrogen bond
What does it mean for a liquid to be fluid?
the particles can slid past each other and the substance can take on the shape of different containers.
Will a substance with a hydrogen bond require a higher or lower melting temperature?
higher
Do melting and freezing happen at the same temperature?
yes. Melting occurs at that temperature when heat is added and freezing occurs when heat is removed
What type of intermolecular force is in this substance:
HCl
hydrogen bond
If a substance undergoes a phase change does it's identity change as well..?
No
Where temperature is constant