If a packet of Kool-Aid is dropped in a mug of water and the red food color spreads throughout the water, what postulate of the particle theory is demonstrated?
Because the food coloring of the Kool-Aid spread (diffused) throughout the water, this activity demonstrated that the particles that make up matter are in constant motion. It also shows that the particles of a liquid are able to flow past one another and not held in a ridged shape.
The particle theory of matter is composed of the following postulates:
- All matter is made of small particles such as atoms, compounds, and molecules.
- These tiny particles are in constant motion.
- There are spaces between the particle that make up matter. Solids have the least amount of space between their particles, liquids of a bit more space between their particles, and gases have the most space between their particles.
- There are forces between these particles that are known as intermolecular forces (“inter” = between, “molecular” = molecule).