MICRO LESSON 1
Pure Substance
Picture it:
Distilled water contains only one kind of particle.
Simple:
A pure substance has one kind of particle and fixed properties.
Example:
Pure copper and oxygen.
Remember:
One kind of particle = pure.
Quick Check:
Is air pure?
MICRO LESSON 2
Mixture
Picture it:
Lemonade contains water, sugar, salt and lemon juice.
Simple:
A mixture contains substances physically combined.
Example:
Air, soil and milk.
Remember:
Components keep their properties.
Quick Check:
Can mixtures be separated physically?
MICRO LESSON 3
Homogeneous and Heterogeneous
Picture it:
Salt water looks uniform but oil and water do not.
Simple:
Homogeneous mixtures are uniform; heterogeneous mixtures are non-uniform.
Example:
Salt solution versus sand in water.
Remember:
Homo means same throughout.
Quick Check:
Classify oil and water.
MICRO LESSON 4
Solution
Picture it:
Sugar disappears in water but remains present.
Simple:
A solution is a homogeneous mixture of solute and solvent.
Example:
Sugar is solute and water solvent.
Remember:
Solute dissolves; solvent dissolves it.
Quick Check:
Identify solute in salt water.
MICRO LESSON 5
Concentration
Picture it:
Two lemonades can have different sweetness.
Simple:
Concentration tells the amount of solute in solution.
Example:
More sugar means more concentrated.
Remember:
More solute = more concentrated.
Quick Check:
What happens after adding water?
MICRO LESSON 6
Suspension
Picture it:
Muddy water settles when left undisturbed.
Simple:
A suspension has visible particles that settle and can be filtered.
Example:
Chalk in water.
Remember:
Suspension settles.
Quick Check:
Why is muddy water a suspension?
MICRO LESSON 7
Colloid
Picture it:
Milk looks uniform but contains tiny dispersed particles.
Simple:
A colloid is heterogeneous but particles do not settle easily.
Example:
Milk, fog and smoke.
Remember:
Colloids scatter light.
Quick Check:
What is Tyndall effect?
MICRO LESSON 8
Tyndall Effect
Picture it:
A light beam becomes visible in fog.
Simple:
Colloidal particles scatter light.
Example:
Sun rays in a dusty room.
Remember:
Visible light path means scattering.
Quick Check:
Does salt solution show it?
MICRO LESSON 9
Separation Methods
Picture it:
Different mixtures need different methods.
Simple:
Filtration, evaporation, centrifugation, chromatography and distillation use property differences.
Example:
Cream from milk by centrifugation.
Remember:
Choose method by property.
Quick Check:
How do we separate salt from water?
MICRO LESSON 10
Elements and Compounds
Picture it:
Iron is one element; water contains hydrogen and oxygen chemically combined.
Simple:
An element has one type of atom; a compound has fixed chemical composition.
Example:
Iron versus water.
Remember:
Compound properties differ from elements.
Quick Check:
Is brass an element?