physical & chemical changes oh my

Physical & Chemical ChangesOh, MY!

Ch. 20Properties & Changes in Matter

Brain warmer:

Looking at the picture, what physical changes are taking place?

Today’s Essential Questions:

1) What are chemical properties?2) What are the differences between physical

and chemical changes?

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.

Review of Physical PropertiesColor & ShapeLength & MassVolume & DensityMelting & Boiling PointStates of MatterAttraction to magnets

1) A change in state of matter produces a physical

change.

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.

Overview of Chemical PropertiesFlammabilityAbility to react

with:OxygenElectricityLightWaterHeatVinegarBleach and MORE

Two substances are mixed to produce…

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.

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.

Chemical Property:Ability to React with6)

Electricity7) Light8) Water9) Heat10)

Vinegar11) Bleach HEAT

LIGHT

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

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