Physical and Chemical Changes
Objectives:
• give examples of physical and chemical changes
• characterize physical and chemical changes using properties and indicators
PHYSICAL CHANGE
CHEMICAL CHANGE
define physical change- a substance can
define chemical change- a substance
be altered but its parts are not
damaged and the chemical
character is not changed
produces a completely new
substance with different properties
Examples:
Examples:
1. burning
2. exploding
3. rusting
4. corroding
5. cooking
1. cutting
2. folding
3. grinding
4. dissolving
5. melting
Indicators-at least 1 accompanies EVERY chemical change
change in temperature-exothermic
change in temperature-endothermic
exothermic- “out of this reaction
endothermic- “into this reaction goes
comes heat” HOT
heat” COLD
How can I use information about properties and changes
to justify whether a change is physical or chemical?
T. O’Toole
formation of light
chemical or fire
*when there is fire--the reaction has 2 indicators: light and temperature
formation of a gas
the gas is both the new substance AND the indicator
*Make sure the change is NOT evaporation!
formation of a precipitate
precipitatethe precipitate is both the new substance AND the indicator
Minute Paper (this is also on your Portfolio Page)
Classify the following changes as physical or chemical
Chemical origami (folding)
Chemical burning
Physical filtering
Physical evaporation
Chemical combustion
Chemical leaves changing color
Chemical exploding fireworks
Physical grinding
Physical sanding
Chemical explosion
How do I get from where I am to where I’m going?
The 10 Minute Makeover
Customize your learning by choosing from the following options each night
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Complete the appropriate section on the Portfolio Page
Review the PPT file on the website
Read pages 31 and pages 41-43 the book
Answer question #19 on page 43. The answer is in Appendix C.
Watch the videos ofchemical change indicators on the chapter page of my website
Identify changes using : http://www.quia.com/jg/1164247.html
Check out the tutorial resources in the LiveBinder
Review the skills from today’s Train Your Brain
How can I use information about properties and changes
to justify whether a change is physical or chemical?
T. O’Toole