Diffusion and States of Matter

These flashcards cover key concepts related to diffusion, states of matter, particle theory, and properties of gases, liquids, and solids.

Diffusion occurs when particles of one substance spread out and mix with the particles of another. __ is the term used to describe this process.

Diffusion

The particles of a smelly gas move __ and spread out until they reach your nose.

in all directions

Particles of gas always move from an area of __ concentration to an area of lower concentration.

high

In solids, the particles are held closely together by __ forces of attraction, preventing them from moving freely.

strong

Liquids can change their shape and flow because their particles are held together by __ forces of attraction.

fairly strong

Gases can be compressed into a smaller volume because their particles are __ apart from each other.

far

Air pressure is the force of air particles hitting a __.

surface

When you suck through a straw, you reduce the pressure inside it, causing the liquid to be pushed up by the __ pressure outside.

air

Brownian motion describes the random movement of __ in a fluid due to collisions with smaller particles.

larger particles

Methane gas produced by rotting waste can build up in landfill sites and cause __ due to increasing pressure.

explosions

The density of a substance is measured as mass per unit __, often expressed in kg/m³ or g/cm³.

volume