PROPERTIES OF LIQUIDS Flashcards
THE PROPERTY OF A LIQUID DEPENDS ON..
kinetic energy of particles
intermolecular forces between particles
What is viscocity?
the resistance to flow
effects of intermolecular forces & shape on viscosity
stronger forces=more viscous
viscosity increases with molecular Wieght
What is surface tension?
imbalance of forces at the top of a liquid sample J/m2
cohesive force vs adhesive?
CO-binds molecules to one another
AD-binds molecules to surface
When does evaporation occur?
when the energetic molecules near the surface of the liquid exceed intermolecular forces and transition into gas phase
what effects boiling point and vapour pressure?
the ease at which liquid goes to gas
what happens to molecules during evaporation in an open system? closed?
O-molecules evaporate and are removed
C-molecules evaporated and condense at same rate.
surface area is greater when
intermolecular forces are weaker
properties of volatile liquids /what they are
evaporate easy
high vapour pressure at room temp
What is a phase change
change in physical state with no composition change
involves in change in energy of system
Surface tension
imbalance of forces on top of a liquid sample
Evaporation occurs when
moleulcues in the liquid phase surpass intermolecular forces and go to gas phase
ease of how this happens affects the boiling and vapour pressure of the liquid
In an open system:
In a closed system:
molecules evaporate and are removed
Molecules condense and evaporate at the same rate
Vapour pressure depends on
- ease at which evaporation occurs
- temp is high
- high surface area/weak intermolecular forces
