Physical Science Week 6

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Physical Science Week 6

• Unit 1 Nature of Matter
• Chemical Properties Changes

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Standard S8P1a

• Distinguish between atoms and molecules.

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Standard S8P1.g

• Identify and demonstrate the law of conservation
  of matter.

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Standard S8P1.d

• Distinguish between physical and chemical
  properties of matter.

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Monday Warm Up (Wk 6)

• If you have 100 grams of a substance and the
  density is 4 g/cm3 what is the volume?
• Unit Test Friday Study everything!!!

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Cornell Notes Chemical Properties and Changes

• Chemical Properties describe matter based on its
  ability to change into new matter that has
  different properties.

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Flammability

• The ability to burn

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Reactivity

• Ability of two or more substances to combine and
  form one or more new substances.

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Comparing Physical Chemical Properties

• Physical properties can be observed without
  changing the substance.
• Chemical properties, not so easy.
• If you burn it to test for flammability, it is
  burnt.

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Characteristic Properties

• Most useful in identifying a substance
• Always the same no matter the size of the sample
• Density, solubility, flammability, reactivity

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Chemical Change

• A change that occurs when one or more substances
  change into entirely new substances with
  different properties.

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Signs of chemical change

• Gas produced (bubbles)
• Odor
• Color change
• Production of heat
• Sound or light produced

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Reversing Chemical Change

• Cake batter to cake is a chemical change.
• How would you undo the change?
• Burn a log how do you undo the change?

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Law of Conservation of Mass

• Mass cannot be created or destroyed in ordinary
  chemical and physical changes.
• What goes into a reaction must come out atom by
  atom.

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Electrolysis of water

• Water is separated into hydrogen and oxygen by
  electricity.
• H2O -gt H2 O2
• ___ H2O -gt ___H2 ___ O2

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Complete p. 55
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Tuesday Warm Up (Wk 6)

• What evidence should you look for to decide if a
  chemical change has occurred?
• Unit test Friday Study everything

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Physical and chemical Change Lab

• Question How do you tell if a change is physical
  or chemical?
• Hypothesis
• Procedure
• Copy data table

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Event Prediction Observations Chemical or Physical Evidence
Cutting an apple
Cutting a carrot
Antacid in water
Vinegar in milk
Baking soda vinegar
Baking soda, citric acid, water
Burning of candle
Leaves turning colors
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• Analyze and Conclude
• 1. How can you determine if a chemical or
  physical change is happening? What is the most
  important question to ask?
• 2. Is one piece of evidence sufficient
  information to determine if it is a chemical or
  physical change? Give an example.
• 3. The Stature of Liberty was originally a copper
  color. After being exposed to air, she turned a
  greenish color. Explain what happened.

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Physical and Chemical Changes

• Physical

• Chemical

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• Glass breaking

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• Hammering wood together to build something

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• A rusting bicycle

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• Melting butter for popcorn

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• Separating sand from gravel

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• Spoiling food

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• Mixing lemonade powder into water

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• Mowing the lawn

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• Corroding metal

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• Bleaching your hair

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• Fireworks exploding

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• Squeezing oranges to make orange juice

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• Frying an egg

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• Pouring milk on your oatmeal

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• Burning leaves

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• Making salt water to gargle with

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• Cream being whipped

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• Burning toast

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• Freezing chocolate covered bananas

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• Melting ice cream

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Wednesday Warm Up (Wk 6)

• Compare and contrast chemical and physical
  changes with a Venn Diagram.

Unit test Friday Study everything
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CRCT Practice

• P. 60-61 1-9
• P. 84-85 1-9
• P. 110 111 1-8
• P. 330-331 1-11
• P. 356 357 1-9

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Thursday Warm Up (Wk 6)

• How many atoms are in one molecule of C6H12O6?
• What are the atoms and how many of each?
• Unit test Friday Study everything

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Study Guide for Unit Test
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Friday Warm Up

• Study silently for unit test 5 minutes.

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Unit Test