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1. Think of your favorite food. 2. How would you describe your food?3. What does it look like? Smell like? Think
of descriptive words.
There are two basic types of properties that we can associate with matter. Physical Properties: Properties that do not
change the chemical nature of matter Chemical Properties: Properties that do
change the chemical nature of matter
Some ways to detect physical properties Color Shape Size Texture Volume Mass
Physical properties do not change the substance Example – stretching a rubber band
Is a change in any physical property of a substance, not in the substance itself. Examples
Breaking a piece of clay in half Changes size and shape only
Change in a substances state of matter Example – water and ice – liquid to solid
Characteristic of a Substance that describes how it can form a new substance Examples
Wood burns and turns into ashes iron rusts when left outdoors Silver develops tarnish on the surface
The change of one substance into another substance
Affects the substances involved in the change
During change combinations of atoms in the original substance is rearranged to make new substance
Odor Produce new smell – i.e. rotten egg – produces sulfur
smell Temperature
Increase or decrease – i.e. Logs burning on campfire Color
Change in color – i.e. fruit changes color as it ripens Bubbles
Formation of gas bubbles – i.e. antacid tablet in water Solid
Forms a solid – two liquids combined called precipitate i.e. – clams shells – seawater combining with creature
Changes in Matter
Matter will change phases when heat is added or lost. Melting: process where a solid
becomes a liquid (heat is added) Melting point – lowest temperature
at which a substance begins to melt Freezing: process which a liquid
becomes a solid (heat is lost) Freezing point – temperature that
a liquid becomes a solid Evaporation: process that a
liquid becomes a gas (heat is added) Occurs at the surface of the liquid
Matter will change phases when heat is added or lost. Sublimation: when a solid
changes to a gas (heat is added) Dry ice
Boiling: Process that a liquid becomes a gas (heat is added) Boiling Point – liquid reaches a certain
temperature. Different substances have different boiling points
Condensation: process by which a gas changes to a liquid (heat is added) Beads of water on glass