SE 402 1b Physical & Chemical Changes

1,623 views

Published on

Published in: Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
1,623
On SlideShare
0
From Embeds
0
Number of Embeds
47
Actions
Shares
0
Downloads
20
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

SE 402 1b Physical & Chemical Changes

  1. 1. Physical & Chemical ChangesObjectives:3.1 Formulate hypothesis regarding thecauses of the changes in objects orsubstances in the student’senvironment3.2 Classify the changes in varioussubstances as either physical or chemicalchanges
  2. 2. Types of Changes:Two Types of ChangesPhysicalChangeChemicalChange
  3. 3. Physical Change: Does not change the chemicalcomposition or the nature of a substance Process is easily reversibleEx. Crumpling & smoothing out paperEx. Freezing water and thawing iceEx. Sublimation – from solid to gas(ex. dry ice (CO2) or iodine)
  4. 4.  Key Words:Crush/PulverizeMeltEvaporationCondensationSublimationSolidificationDissolveTells you aphysical changeoccurred
  5. 5. Chemical Changes: Changes the chemical composition ormake-up of the substance New substances are formed with newproperties Not easily reversible(Reversible only through chemical meansor reactions)Rust
  6. 6. Signs of Chemical Changes:Tells you achemical changeoccurred Formation of a gas Formation of a precipitate Change in color Production of heat &/or light Increase or decrease in mass
  7. 7. Physical Change-Sublimation-Freezing-Condensation-Evaporation-Pulverization (crush)-Solidification-DissolvingChemical Change- Burning- Neutralization- Combustion- Corrosion (rusting)
  8. 8. Which of the following are examplesof physical changes?1. Melting Butter2. Rusted Car3. Dissolving Sugarin Tea4. Crushing Rock6. Burning Wood5. Condensation
  9. 9. Which of the following are examplesof chemical changes?1. Cooking an egg3. Sublimation ofDry Ice2. Rotting food4. Freezing Rain6. CrumplingPaper5. Burning acandle
  10. 10. You carry out the followingsteps of an experiment &record your observations.1. You place a powder in a test tube2. You heat the test tube. You noticethat a colorless gas & a copper-colored liquid are produced.3. You collect the copper-colored liquid& cool it. It becomes a solid.Where did a chemicalchange occur? A physicalchange?
  11. 11. Activities: Physical Science Worksheet #2 Student Study Guide – Mod 1-14 -1-16
  12. 12. References Student Study Guide – PhysicalScience 416/436 - MEQ Science Quest – Grenier, Daigle,Rheaume – 1998, Cheneliere Animation Factory Clip Art Microsoft Clip Art Google Images

×