Transcript Matter and Its Changes

Riddle
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It can be anything, and it makes up
everything.
But it always takes up space and has
mass.
What it is?
Matter and Its
Changes
Chapter 2.1
Chemistry 1.1
Chemistry: Definition
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The study of properties of matter and how it
changes
What is Matter?
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Anything that:
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Has Mass
Takes up Space (volume)
Building Blocks of Matter
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Elements: Cannot be
broken down into any
other substance by
chemical or physical
means
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All matter around you is
composed of one
element or a
combination of elements
Building Blocks of Matter - 2
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Molecule: 2 or more
atoms chemically
bonded together,
making a new
substance
Compound: A
molecule made of 2 or
more elements,
making a new
substance
Building Blocks of Matter - 3
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Mixture: 2 or more
substances mixed by
not bonded to make a
new substance
Solution: a well mixed
mixture in liquid form
(salt water)
Homogeneous vs. Heterogeneous
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Homo – means same
Hetero – means different
Homogeneous mixture is the same
everywhere
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Can’t see individual pieces, can’t filter
Heterogeneous mixture is not the same
everywhere
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Different in different places
Can see the pieces
Can filter usually
Mixing Liquids
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Miscible
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two liquids that dissolve in each other. They mix
to form a solution
Immiscible
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Two liquids that don’t mix and stay mixed. They
may make a suspension, but they don’t make a
solution
Changes in Matter - 1
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Physical Change:
change in form or
appearance that does
not change the actual
substance (ice to
water to steam)
Changes in Matter - 2
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Chemical Change:
substances mix to
form new substances
with different
properties
Observing Chemical Reactions
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Key Characteristic: production of new
materials that are chemically different from
the starting materials
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Gas released
Temperature change
New solid material
Smell
etc
Chemical Reactions on a Small Scale
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ONE (1) particle of an
element is an ATOM
Molecule – 2 or more
atoms combined
Chemical Reactions on a Small Scale
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Chemical BONDS are
the ‘glue’ that holds
atoms together
Chemical
REACTIONS occur
when chemical
bonds are formed or
broken.
Section 1.1 Review Questions
1. How are element,
 Element cannot be
compound, mixture
broken down.
different?
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Compound is two or
more elements
combined chemically.
Mixture is 2 or more
items that can be
physically separated
Section 1.1 Review Questions
2. What forms of
evidence show
a chemical
reaction has
take place?
3. What happens
to chemical
bonds in a
chemical
reaction?
New substances are
formed, can be seen by
color, precipitation, gas
released, temperature
changes, changes in
properties.
 Bonds are broken or new
bonds may form
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Section 1.1 Review Questions
4. What is
difference
between atom
and molecule?
5. Classify
changes: for
Ice cream, sugar,
gasoline, mirror,
milk
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Atom is smallest particle of
an element. Molecule is
combination of 2 or more
atoms
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Ice cream melting is
physical.
Sugar dissolving is physical
Gasoline burning is
chemical
mirror fogging is physical
milk souring is chemical
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