lab 1 notes Flashcards
What are the physical properties? (There are 6)
Color, odor, melting point, boiling point, density, refractive index are what type of properties?
How are organic compounds characterized? (4 things)
-melting point and boiling point
-index measurements
-density
How are vapors formed?
Solids melt into liquids and liquids boil to form vapors.
solids melting into liquids, and liquids boiling to form vapors are known as _____ and occur at____
phase transitions
constant temperatures
How are solids and liquids held together?
BY intermolecular forces of attraction
What are the intermolecular forces?
Vander Waal’s forces dipole-dipole forces
london dispersion, and hydrogen bonding
Are intermolecular forces stronger in solids or liquids? Why?
- Solids because solids hold the atoms and molecules close together
Describe what happens to atoms or molecules in solids
The atoms or molecules making up the solid just vibrate in place and the kinetic energy is very low.
What happens as the temperature of the solid increases? What happens to the intermolecular forces? Kinetic energy?
the atoms or molecules making up the solid pick up the kinetic energy and at a certain temperature the kinetic energy becomes more than the intermolecular forces
holding the particles together.
When a solid become a liquid, we call it
melting
The reverse process of liquid forming a solid is called
freezing
True or false: Melting and freezing occur at the same temperature
True
True or False: Melting point and freezing point of a liquid are the same
True
What is the difference between melting and freezing?
The only difference is in
melting we give energy to the system and in freezing we take energy away from the system
Heat of fusion is
melting we give energy to the system and in freezing we take energy away from the system
