What is diffusion of molecules?
The movement of molecules from an area of high concentration to an area of low concentration
What factors affect the rate of diffusion?
- Concentration gradient
- Shape and size of molecules
- Temperature
- Distance
- Surface area
How does the concentration gradient affect diffusion?
The greater the concentration gradient, the faster the rate of diffusion
How do the shape and size of molecules influence diffusion?
Smaller and more streamlined molecules diffuse more quickly than larger or bulkier ones
What effect does temperature have on the rate of diffusion?
Higher temperature increases molecular energy and movement, thus increasing diffusion rate
What is the relationship between distance and the rate of diffusion?
The rate of diffusion is quicker over shorter distances than longer ones
How does surface area affect diffusion through a semi-permeable membrane?
Greater surface area increases the rate of diffusion of molecules through the membrane
What is the significance of surface area to volume ratio in diffusion?
As an object gets bigger, the surface area to volume ratio gets smaller, affecting diffusion efficiency
What was Robert Brown’s contribution to the understanding of molecular movement?
He observed pollen grains moving randomly in water, leading to the discovery of Brownian motion
What is Brownian motion?
The random movement of particles suspended in a fluid, caused by collisions with smaller molecules
What does kinetic theory explain?
The motion of particles in solids, liquids, and gases, and their energy at different temperatures
What happens to particles at absolute zero?
All movement of particles stops
How do particles behave in solids?
Particles are touching each other in fixed positions and can only vibrate
How do particles behave in liquids?
Particles are close together, can slide past each other, and are arranged randomly
How do particles behave in gases?
Particles are far apart, move quickly, and can travel large distances in all directions
What is dynamic equilibrium in the context of diffusion?
A state where molecules move between two areas at the same rate, resulting in no net change in concentration
True or False: Smaller animals lose heat more quickly due to a higher surface area to volume ratio.
True
Fill in the blank: At absolute zero, the temperature is _______ on the Kelvin temperature scale.
0 K
Fill in the blank: The kinetic model of matter is based on the concept of _______.
Brownian motion
What is the relationship between temperature increase and kinetic energy of particles?
Increasing temperature results in more kinetic energy and faster movement of particles
What unique ability do humans have concerning sweat glands?
Humans have the most efficient sweat glands of any species, aiding in temperature regulation
