Single and Multiphase Systems Flashcards
What is Daltons Law
Total Pressure is the Sum of the Partial pressures of the Gasses in the System
How do you calculate Partial Pressure
Mole Fraction in the gas phase X Total Pressure
What is Vapour Pressure
The pressure exerted by a Vapour in Equilibrium from a liquid held at a given temperature in a closed system.
What is the Antoine Equation
One Liquid has a Vapour Pressure of 2.3 kPA, another has a Vapour Pressure of 5.7 Kpa at the same temperature.
Which is More Voltatile
5.7 Kpa
More of the Liquid has evaporated then the one with a Vapour Pressure of 2.3 Kpa
What is Raoults Law
Partial Pressure = the Mole Fraction in the Liquid Phase X Vapour Pressure
What are the Assumptions taken by Raoults Law
Intermolecular Forces between Unlike molecules (Adhesive) = the intermolecular forces between like molecules (cohesive)
Physical Properties of the Components Are Identical
What is Negative Deviation
Vapour Pressure is Less than Predicted
Adhesive forces > Cohesive Forces
Fewer molecules of each molecule in the Vapour Phase than expected
What is Positive Deviation
Vapour Pressure Greater than Predicted
Adhesive Forces < Cohesive Forces
More molecules of each molecule in the Vapour Phase than expected
Draw Graphs of Vapour Pressure against Mole Fraction, for Negative Deviation Positive Deviation and an Ideal Solution
What are the Mole Fractions of Hexane in Liquid and Vapour Phase at 50 Degrees
What are the Boiling Points of Hexane and Dichloromethane
What are the Mole Fractions of DCM in the Liquid and Vapour phases at 60 Degrees?
30g of Hexane and 20g of Dichloromethane were mixed, What is the Boiling point of the Mixture & the Composition of the First Bubble
A Vapour Containing 40& Hexane is Cooled to 50%
What are the proportions of pure Vapour and pure Liquid Present
In the 2 Phase Reigon, what are the proportions of Vapour and Liquid
What is Henrys Law
The amount of Gas that Dissolves into a Liquid at a Given Temperature is directly proportional to the Partial Pressure
Describe what Situations is it Better to Use Raout’s Law , and WHich Situations is it Better to use Henry’s Law
Raouts - Concentrated Solutions (Liquid Composition Close to 1 )
Both Components have Similar Chemical Structures
Henry’s
Dilute Solutions (Liquid Composition Close to 0)
Components Dont, Dissociate Ionise or React in Liquid Phase
The Following Table is the H values for CO2 at different Temperatures
Use the Table to Explain Colder Drinks Taste More Fizzy
Attempt A & B
Attempt C & D
