This document discusses the classification of mixtures as solutions, suspensions, or colloids based on particle size. Solutions are homogeneous mixtures where particles are too small to scatter light or be filtered out. Suspensions are heterogeneous mixtures where particles are large enough to separate over time by settling or being filtered. Colloids have intermediate particle sizes that do not separate but can scatter light.
A mixture forms when two or more substances are combined such that each substance retains its own chemical identity. Everywhere around us are made up of mixtures. We can see them in nature, along the surface of the earth, in the oceans and in the foods we eat. There are infinite numbers of mixtures that can be combined into homogeneous or heterogeneous.
A mixture forms when two or more substances are combined such that each substance retains its own chemical identity. Everywhere around us are made up of mixtures. We can see them in nature, along the surface of the earth, in the oceans and in the foods we eat. There are infinite numbers of mixtures that can be combined into homogeneous or heterogeneous.
Chapter - 2, Is matter around us pure?, Science, Class 9Shivam Parmar
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Chapter - 2, Is matter around us pure?, Science, Class 9
PURE SUBSTANCES
WHAT IS A MIXTURE?
HOMOGENEOUS MIXTURE
HETEROGENEOUS MIXTURE
DIFFERENCE BETWEEN MIXTURES AND COMPOUNDS
SOLUTION
PROPERTIES OF SOLUTION
DIFFERENT TYPES OF SOLUTIONS
CONCENTRATION
SUSPENSION
COLLOIDAL SOLUTION
PROPERTIES OF COLLOIDS
TYNDALL EFFECT
COMPONENTS OF COLLOID
SEPARATING THE COMPONENTS OF A MIXTURE
PHYSICAL CHANGE
CHEMICAL CHANGE
Every topic of this chapter is well written concisely and visuals will help you in understanding and imagining the practicality of all the topics.
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3. It’s all about the particles!
• The size of the particles has a great effect on the
properties of a mixture.
• You must observe a mixture’s properties before
deciding whether it is heterogeneous or homogeneous.
• Mixtures is also classified as solutions, suspensions,
or colloids based on particle size.
4. Solutions
Q: When iced-tea mix is dissolved in
water, it forms what kind of mixture?
A: HOMOGENEOUS MIXTURE
When substances dissolve and form a
homogeneous mixture, the mixture is
called a solution. Whatever substance
there is more of is called the solvent.
The other is called the solute (ex.
Iced tea-the solvent is the water, the
solute is the tea mix).
5. Properties of a Solution
• They do not separate into layers over
time.
• If they are poured through a filter,
none of the substances will get trapped.
• Light passes through them.
All of the particles in a solution are too
small to become separated, filter out,
or scatter light.
6. Suspensions
• Flour in water, like
other liquids that need
to be “shaken well
before using”, are
called suspensions.
• Muddy water taken
from a swamp is
another example.
7. Properties of a Suspension
• Heterogeneous mixture
• Separates into layers over time.
• Filters can separate particles that make up a
suspension.
• Particles are larger than those in a solution.
• Scatter light.
Suspended particles settle out of a suspension.
8. Colloids
Colloids contain some
particles that are
intermediate between those
in a solution and those in a
suspension. Examples include
peanut butter, pudding, Jello,
whipped cream, and even fog!
9. Properties of Colloids
• Do not separate into layers.
• Particles will not become trapped by a
filter.
• Scatter light.
Colloids and suspensions appear cloudy;
unlike solutions which are much clearer.
Colloids and solutions will not separate
into layers; suspensions will.
10. Examples of Colloids
Dispersing Medium
Gas Liquid Solid
Gas
shaving
cream,
whipped
cream
foam rubber,
sponge,
pumice
Liquid
fogs, clouds,
aerosol can
spray
mayonnaise,
milk, face
cream,
hair gel
jelly,
cheese,
butter
Solid
smoke,
car exhaust,
airborne
viruses
Gold in water,
milk of
magnesia,
river silt
alloys of
metals
(steel,
brass)