Comparing Physical and Chemical Properties
Substance Physical Property
Chemical Property
Helium Less dense than air
Nonflammable
Wood Grainy texture Flammable
Baking soda White powder Reacts with vinegar to produce bubbles
Rubbing alcohol Clear liquid Flammable
Red food coloring Red color Reacts with bleach and loses color
Iron Malleable Reacts with oxygen
CHEMICAL CHANGE A chemical change is a change in matter in which the substance that makes up the matter changes into something else with different chemical AND physical properties!
**A NEW SUBSTANCE IS CREATED!!** All reactions involve energy (light,
sound, or thermal) - Some require it to start, some give off energy, and some absorb energy.
SIGNS OF A CHEMICAL CHANGE
Change in Odor Change in Temperature Formation of Bubbles/Gas Change in Color Formation of a Precipitate
(solid that forms when two liquids combine)
