This document discusses the differences between physical and chemical properties and changes. Physical properties describe how a substance appears, like its color, shape, or mass, but do not change the substance's identity. A physical change alters a substance's appearance or form without creating a new substance. In contrast, chemical properties determine how a substance interacts chemically with others. A chemical change produces one or more new substances with different chemical properties from the original. Common signs that a chemical change occurred include a new color, odor, gas production, or temperature change.

1. Chemical Properties and Changes

2. Prepared by Ahmed .H. Mohammed
• The topics we are talking about
• Physical Properties
• Chemical Properties determine
• After a physical change
• Chemical Properties
• After a physical change

3. Do you remember what Physical
Properties are???
• Color
• State of Matter
• Shape
• Length
• Mass
• Magnetism

4. • Chemical Properties determine how a
substance interacts with other
substances
• Some examples are:
• *flammability
• *reactivity to an acid
• *reactivity to water

5. After a physical change, the appearance of the
substance may be different but it is still the
same substance
• EXAMPLES:
• Chopping wood
• Cutting a steak
• Bending a metal
• Cracking an egg
•
• Tearing paper

6. After a physical change, a new substance is
produced with NEW PROPERTIES. These
properties are different from the original
substance!
• EXAMPLES :
• Digesting a steak
• Burning wood
• Rusting of metal
• Frying an egg

7. Physical or Chemical???
• 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

8. • 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

9. 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