Chemical Properties
BY: BRIANNA SHIELDS
DO NOW
• On the last page of your note packet
from last class: Label the arrows on
the diagram with the words
evaporation, melting, freezing and
condensation
• Also, label where the solids, liquids
and gases exist
• Work with your group members
GOAL
• To distinguish between physical and
chemical changes
• Chemical
Changes
• Changing the substance into a
new one by changing atoms
• Other
Chemical
Indicators
• 1. Burning
• 2. Foaming/Fizzing/ Bubbling
• Other
Chemical
Indicators
• 3. Odor change
• 4. Color change
• 5. Corroding Acids
• Other
Chemical
Indicators
• 6. Rusting metal (iron +
oxygen = rust)
• 7. Explosions (fireworks)
• 8. Verdigris- greened statutes
(copper + sulfur)
• Other
Chemical
Indicators
• 9. Cooking & some food
production (cake baking,
cheese production)
• 10. Chemical processes in
nature (photosynthesis)
Physical and Chemical Changes
• Chemical
Change
• A substance changes into a
new and different substance
• The atoms are altered
• Often involves chemical rx
2 chemical indicators
• ACIDS
–
–
–
–
–
Corrosive
Sour taste
pH paper 1-6 (reddish)
Turns litmus red
Phenopthalein in acid
(no color change)
– Vinegar & lemon juice
• BASES
–
–
–
–
–
Corrosive, slippery
Bitter taste
pH paper 8-14 (bluish)
Turns litmus blue
Phenopthalein in base
turns pink
– Soaps, cleaning
products
Acids & Bases
• Watch the demonstrations at the front
counter- are the substances acids or bases?
How do you know?
Physical or Chemical Change?
•
•
•
•
•
•
•
Painting a statue
Chopping wood
Crushing sugar crystals
Dissolving salt
Boiling water
Exploding firecrackers
Mixing baking soda & vinegar
Physical or Chemical Change?
•
•
•
•
•
•
•
Rotting eggs
Crumpling wax paper
Slicing cucumber
Fizzing antacid in water
Lighting a match
Zipping a coat up
Rusting bike chains