Mixtures vs. Pure Substances

Inspect, classify, and separate matter

Teacher mode

Mission: classify the sample

Inspect the particle pattern. Decide whether it is pure, a homogeneous mixture, or a heterogeneous mixture.

Experiment

Sample and process

Sample

Second component0%

Mixing intensity0.5×

Temperature25 °C

Separation method

Simulation speed1.0×

Live evidence particle model

Pure substanceclassification

100%uniformity

0%separated

100%sample remaining

Components present1

Canvas graph key

UniformitySeparatedRemaining

The text-free graph shows how the sample changes over time.

Particle

Waterparticle type

Mixedstate

Camera

Zoom1.0×

What is happening?

A pure substance has one particle type and a fixed composition. Mixtures contain two or more substances physically combined.

Teacher tools

Reveal classification

Interactive lecture

Step 1 of 100%

Ready. Lecture will not start automatically.

LanguageVoice sourceVoice

1. What matter contains

What to watch

Watch the inspection chamber reveal one repeating particle type.

Chapters

Learning objectives

Distinguish pure substances from mixtures using particle evidence.
Compare homogeneous and heterogeneous mixtures.
Relate concentration to component proportions.
Select filtration, evaporation, or magnetism for separation.

Key concepts

A pure substance has a fixed composition and one kind of particle or repeating chemical unit. A mixture contains substances combined physically, so components retain properties that can enable separation.

Homogeneous mixtures are uniform at the observed scale. Heterogeneous mixtures have distinguishable regions or phases.

Try these experiments

Increase salt concentration and inspect the particle view.
Stop stirring sand-water and observe sedimentation.
Filter sand-water, then compare what remains.
Use a magnet on iron and sand.
Evaporate saltwater and observe solvent removal.

Questions for exploration

Why can dissolved salt pass through ordinary filter paper?
Why is air classified as a homogeneous mixture?
Which physical property does each separation method exploit?

Real-world applications

Water treatment, recycling, mining, food processing, medicine purification, and forensic analysis all rely on identifying and separating mixtures.

Common misconceptions

Clear does not always mean pure.
Dissolving is not the same as disappearing.
Every uniform material is not necessarily an element.
Filtration does not remove dissolved ions.

Matter check

0 / 7

Answer each question for instant feedback.