Molecular Kinetic Theory Model Flashcards
Brownian Motion
Random motion of larger particles in a fluid caused by collisions with surrounding particles.
How is Brownian Motion Observed?
Through looking at smoke particles under a microscope.
What did Brownian motion contribute to?
Evidence for existence of atoms and molecules.
Simple Molecular Model to explain Boyles Law
Increase volume of a fixed mass of gas, molecules move further apart, less frequent collisions so lower pressure.
Simple Molecular Model to explain Charles Law
Gas temp increased, molecules gain KE, move quicker and because pressure is constant, molecules move further apart and volume increases.
Simple Molecular Model to explain Pressure Law
Gas temp increased, molecules gain KE, as volume is constant the frequency of collisions between molecules and container increases and collide at higher speeds so pressure increases.
How did Kinetic Theory arise
Not empirical, arose from theory
Assumption 1
No intermolecular forces act on molecules
Assumption 2
Duration of collisions is negligible compared to time between collisions.
Assumption 3
Motion of molecules is random and they experience perfectly elastic collisions.
Assumption 4
Motion of molecules follow Newton’s Laws
Assumption 5
Molecules move in straight lines between collisions
