UNIT III Lesson 2 Classification of Matter. Classification of matter.
Classification of matter ppt
Transcript of Classification of matter ppt
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oMatter is everything around
you
oMatter is anything made up of
atoms and molecules
oAnything that has mass and
takes up space.
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Atoms are pieces of matter
You are made up of billions and
billions of atoms
Atoms are the building blocks
You need atoms to build molecules
Molecules are atoms bonded
together
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Matter
Pure
Substances
Elements Compounds
Mixtures
Homogeneous
Mixtures
Heterogeneous
Mixtures
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◦Are also known as substances.
◦Have a constant composition.
• Examples:
• H2O, O2 (no matter how they are
prepared, they will always have this
ratio of atoms)
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Matter
Pure
Substances
Elements Compounds
Mixtures
Homogeneous
Mixtures
Heterogeneous
Mixtures
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◦Elements contain only one single type
of atom (found on the Periodic Table of
Elements.)
◦ Simplest form of matter that has its
own unique set of properties.
◦Cannot be separated by physical or
chemical changes.Monatomic
ElementDiatomic Element
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Matter
Pure
Substances
Elements Compounds
Mixtures
Homogeneous
Mixtures
Heterogeneous
Mixtures
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◦ Two or more atoms that are CHEMICALLY
combined.
◦ Have their own unique properties that can differ
from the elements that make up that compound.
◦ Examples include:
Sodium Chloride (Table Salt)
Ammonia
◦Can be separated by a chemical change.
NH3
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Matter
Pure
Substances
Elements Compounds
Mixtures
Homogeneous
Mixtures
Heterogeneous
Mixtures
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◦ Two or more substances that are
PHYSICALLY combined. (not bonded)
◦ Substances retain their own properties.
◦ Can be separated into components by
physical changes. (ex: filtering)
Particle
Diagram of
a Mixture
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◦ An uneven mixture of particles
◦ Have visible differences
◦ Examples include:
Sand and Water
Oil and Water
Salt & Pepper
◦ Are easily separated
by filtration.
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◦ Have no visible differences until you reach the atomic or molecular level.
◦ Also known as solutions
◦ Can be separated back into the pure substances
◦ Examples include: Air Salt water Tap Water Metal Alloys (brass, sterling silver, or steel)
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Solutions are homogeneous mixtures of
particles so small they can not be seen
with a microscope
The particles will never settle out to the
bottom
Solutions stay mixed
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Solvent Solute
The Solvent is the part of the solution that does the dissolving
When a solid dissolves into a liquid the liquid is the solvent
In salt water, the water is the solvent
The Solute is the part
of the solution that
gets dissolved
When a solid dissolves
into a liquid the solid
is the solute
In Salt water, the salt
is the solute
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Colloid
oHomogeneous
omedium-sized particles
oparticles don’t settle
oEX: milk
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Yummy Lemonade or Orange Juice with Pulp
o Heterogeneous
o large particles
o particles settle
o EX:fresh-squeezed
lemonade
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Tyndall EffectDo They or Don’t They pass the Tyndall Test???
o Light will scatter or
bounce off of particles
that are large enough
o The scattering of light
by colloidal particles is
the Tyndall Effect
o The Tyndall test is used
to distinguish between a
colloid from a solution
o Particles in solution DO
NOT pass the Tyndall
Test
o Colloids and particles in
suspension DO Pass the
Tyndall test
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Physical Properties Chemical Properties
Color
Size
Shape
Density
Melting Point
Boiling Point
Physical Properties can be changed without changing the identity of the substances
pH (Acid or Base)
Reaction with oxygen
(flammability)
Reaction with water
Reaction with metals
Chemical Properties tell
you how a substance will
react and undergo a
chemical change
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Physical Changes Chemical Changes
Physical changes change
a physical property
The substance remains
the same substance
Example: Cutting a
sandwich in half
Chemical Changes are reactions that form one or more new substances
Three common types of changes are a change in color, the production of gas (fizzing) and a formation of a precipitate(solid separating from a liquid)
Example: Rust on a bike chain
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Change in color: What happens to a banana
over time?
That is a which causes
the peel to turn colors
What happens when you leave your bike out in
the rain for a long time?
That is a
A change in color is one indicator that a
chemical change has occurred and has produced
at least one new substance
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What happens when you add vinegar to
baking soda?
This is because the baking soda is undergoing
a and producing a gas this
is why is bubbles
When you bake a cake, a
takes place that causes the cake to rise because
of carbon dioxide (gas)expanding
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The Law of the Conservation of Mass is that
ALL matter present before a chemical change
EQUALS the mass of all the substances after
the change
This is similar to another law that you learned
Which one?
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THE END!!!!