Physical & chemical changes oh my
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Physical & Chemical ChangesOh, MY!
Ch. 20Properties & Changes in Matter
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Brain warmer:
Looking at the picture, what physical changes are taking place?
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Today’s Essential Questions:
1) What are chemical properties?2) What are the differences between physical
and chemical changes?
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Goals for today:
Goal #1- Recognize and list chemical properties by viewing power point and note-taking.
Goal #2- Differentiate and classify physical and chemical changes through an on-line lab.
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Review of Physical PropertiesColor & ShapeLength & MassVolume & DensityMelting & Boiling PointStates of MatterAttraction to magnets
1) A change in state of matter produces a physical
change.
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Chemical Properties2) What is a chemical property?Any characteristic that gives a substance the
ability to undergo a change that results in a NEW substance.
3) What is a chemical change?A change in the identity of a substance due to
the chemical properties of a substance.
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Overview of Chemical PropertiesFlammabilityAbility to react
with:OxygenElectricityLightWaterHeatVinegarBleach and MORE
Two substances are mixed to produce…
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Chemical Property-Flammability4) Flammability- the ability of something
to catch fire or produce flames
Example: When wood is set on fire. Eventually the wood becomes ash, noting a chemical change.
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Chemical Property:Ability to React with Oxygen5) Ability to React with Oxygen
•Example-Fruit, such as apples, will turn brown when exposed to oxygen. This is a chemical reaction.
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Chemical Property:Ability to React with6)
Electricity7) Light8) Water9) Heat10)
Vinegar11) Bleach HEAT
LIGHT
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How to tell:Is it a physical or chemical change?
Physical Chemical
•Changes shape or size•Dissolves•Changes phase or state of matter•Reversible
•Makes new substance•It burns•Temperature changes without heating or cooling•It bubbles (or makes a gas)•It can change color•IRREVERSIBLE
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Check for UnderstandingAre the following examples of physical or
chemical changes?1) Cutting Grass2) Burning Toast3) Wadding up Homework4) Ice Cream Melting5) Frying an Egg6) Gasoline Combustion 7) Sweat Evaporating