chemical properties-and-changes
DESCRIPTION
For use in 3 week of 1st 6-weeksTRANSCRIPT
Do you remember what Physical Properties are???
• Color
• Shape
• Mass
• State of Matter
• Length
• Magnetism
Chemical Properties determine how a substance interacts with other substances
Some examples are:*flammability*reactivity to an acid*reactivity to water
After a PHYSICAL CHANGE, the appearance of the substance may be different but it is still the same substance
EXAMPLES:
Cutting a steak
Cracking an egg
Chopping wood
Bending a metal
Tearing paper
After a CHEMICAL CHANGE, a new substance is produced with NEW PROPERTIES. These properties are different from the original substance!
EXAMPLES:Burning woodFrying an egg
Digesting a steak
Rusting of metal
Here are some signs that a CHEMICAL CHANGE took place:
New color
New odor or smell
Gas bubbles or smoke
An increase or decrease in temperature
Physical or Chemical???Use the A-F cards to separate the Physical Changes from the
Chemical Changes!
A. You cut a sheet of aluminum foil in half
B. Your friend melts some butter for her popcorn
C. Your Mom lights a candle in a dark room
D. Rubbing alcohol evaporates from your hand
E. Hydrogen peroxide bubbles when you put it on a cut on your leg
F. You leave the milk on the counter all night and discover it has soured in the morning