WHAT ARE PHYSICAL AND CHEMICAL PROPERTIES?

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WHAT ARE PHYSICAL AND CHEMICAL PROPERTIES?

• Chapter 8
• Lesson 2
• SPIs

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AT THE END OF THIS LESSON YOU WILL KNOW THE
DIFFERENCE BETWEEN

• Physical and Chemical Properties

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LETS BREAK THIS DOWNWhen the word
properties is used, what are we really talking
about?
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Properties is a word used to describe matter.
Who remembers what matter is?
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Recalling Prior Knowledge

• Matter is anything with mass (weight) and takes
  up space.
• So properties describes matter

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Every object or material you can think of has
some form of matterso every object or material
will have physical or chemical properties.
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Lets read to find out more about Properties on
PP. 296 and 297.
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Question(Analyze)

• What properties of wood and metal make them
  better materials for a baseball bat than paper or
  glass? (Remember, properties describe matter)

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Answer

• Wood and metal are stronger and less breakable
  than paper or glass.
• (Can you imagine a baseball bat made of paper or
  glass?)
• wood and metal Matter
• stronger and less breakable Properties
• glass and paper Matter

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Question(Compare and Contrast)

• How are the physical properties of paper and
  aluminum foil alike and different?

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Answer

• Compare (Alike) Both are
• Thin
• Flexible
• Flat
• Contrast (Different)
• Paper is white and dull
• Foil is silver and shiny.

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Question(Infer)

• How do you know that a chemical change takes
  place when paper burns?

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Answer

• New matter is produced that has a different
  identity (look or appearance) and different
  properties from the original paper.

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Science JournalsVocabulary
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VOCABULARYboiling pointchemical
propertyconductivitydensitymelting
pointsolubility
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VOCABULARYboiling point temperature at
which a substance changes from a liquid to a gas.

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VOCABULARYChemical property ability of a
material to change its chemical makeup.
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VOCABULARYConductivity ability to carry
energy
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VOCABULARYdensity mass per unit volume of
a substance
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VOCABULARYmelting point temperature at
which a substance changes from a solid to a
liquid
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VOCABULARYsolubility measure of how much
of one substance can dissolve in another
substance
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Who remembers what youre supposed to know by the
end of this lesson?
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The difference between

• Physical and Chemical properties!!!

Lets continue by reading PP. 298 and 299
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Compare and Contrast

• How are the physical properties of solids and
  liquids alike and different?

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Compare and Contrast

• Compare (Alike)
• Both have definite volume
• Contrast (Different)
• Solids have a definite shape
• Liquids take on the shape of their container

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Apply What Youre Learning

• What if you have two samples of an unknown
  substance that have the same color, texture, and
  density. How could you use temperature changes to
  find out if they are the same substance or
  different substances?
• (Refer back to the selection if necessary)

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Apply What Youre Learning

• Find the samples melting and/or boiling points.
  If the samples have the same melting point and
  the same boiling point, they are probably the
  same substance.
• Ahhh, now youre catching on

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Analyze

• A mixture of water and rubbing alcohol is heated.
  At 82 degrees Celsius, the mixture begins to
  boil, and some of the liquid turns into gas. The
  rest of the liquid doesnt turn to a gas until
  the temperature is increased to 100 degrees
  Celsius. What is happening to the mixture as it
  is heated?
• Hint Remember, this is a mixture.

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Answer

• Rubbing alcohols boiling point is 82 degrees
  Celsius, while waters boiling point is 100
  degrees Celsius. When you heat the mixture, it
  first reaches rubbing alcohols boiling point,
  and the rubbing alcohol begins to turn into a
  gas. When it reaches waters boiling point, the
  water begins to turn into a gas.

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Lets Continue Reading

• Solubility and Conductivity PP. 300 and 301

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Recall Details

• What new material is formed when
• wood is burned?

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Answer

• Burnt wood turns to ash.

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Question

• A metal bicycle that begins to rust after being
  left out in the rain has undergone what type of
  change, physical or chemical? How do you know?

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Answer

• Chemical, because the rust is a different kind of
  matter than metal.

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Question

• What type of change is caused by cutting?
  Physical or chemical? Explain.
• What kind of change is caused by burning?
  Physical or chemical? Explain.

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Answer

• Cutting is a physical change because it changes
  the shape of the material but does not change the
  kind of material itself.
• Burning is a chemical change because it changes
  into a new kind of material.

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Question

• How is a chemical property different than a
  physical property?

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Answer

• Chemical properties describe a substances
  ability to become a new substance.
• For Example
• Water turns to vapor new substance chemical
  change.
• Ice turns to liquid new substance chemical
  change.
• Cake batter turns to cake new substance
  chemical change.
• Jell-O sugar crystals turn to solid Jell-O new
  substance chemical change.

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Question

• Cooking an egg causes new kinds of matter to
  form. Take a look at the illustration
• on P. 302. Which material in the picture
  undergoes a chemical change when heated, the egg
  or the frying pan? Explain.

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Answer

• The egg because it changes from a raw egg to a
  cooked egg. Therefore, a chemical change happens
  to the egg.

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Question

• What type of change occurs when a raw egg is
  boiled?

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Answer

• Chemical, because new kinds of matter are formed.

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Question

• What are we supposed to learn from this lesson?
• Every hand should be in the air by now!!!

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All Together Now

• The Difference Between Physical
• and Chemical Properties!!!