Chp4 Flashcards
What are the three states of matter?
Solid, Liquid, Gas
In which state of matter are particles touching one another?
Solid and Liquid
In which state of matter are particles far apart from one another?
Gas
What is the relative position of particles in a solid?
Touching one another
What is the relative movement of particles in a solid?
Fixed in a regular three-dimensional lattice; can only vibrate about fixed positions
What is the relative movement of particles in a liquid?
Moving randomly through the liquid, often in weakly bonded groups; vibration, rotation and translational motion are allowed
How do particles behave in a gas?
Individual molecules moving randomly at high speeds, colliding with and bouncing off one another and the walls of their container
Standard Enthalpy change of atomisation
The enthalphy change that occurs when 1 mole of gaseous atom is produced from an element
Why do gases behave less ideally at high pressure
Volume of their molecules becomes an increasingly significant proportion of the overall volume of the gas
Why do gases behave less ideally at low temp
Less kinetic energy which increases intermolecular forces of attraction
Assumption about ideal gas
- molecules behave as rigid spheres
- no intermolecular forces between molecules
- collisions perfectly elastic
- molecules have no volume
