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Physical and Chemical Changes
Transcript of Physical and Chemical Changes
Describes a physical characteristic of an object or substance.
Can you describe some of the physical
properties of this piece of paper?
Some common physical properties are:
Melting and boiling point
Density: The amount of mass in a certain volume.
When physical properties change we call th
When physical properties change we have a physical change
Physical Change: A change in matter from one form to another, without a change in chemical properties. (Book def.)
Physical changes do not form a new substance
Physical Changes are reversible by physical means.
Examples of Physical Changes
Crumbling a piece of paper
Any change of state is a physical change.
Dissolving is a physical change.
How could you reverse it?
Describes a chemical characteristic of an object or substance.
When chemical properties are changed a chemical change occurs.
Ice, Steam, and Liquid Water are all the same substance.
Remember, anything that can be reversed and doesn't form a new substance is a physical change.
Explain why the ice is undergoing a physical change.
Examples of Chemical Properties
Flammability: How easily something will burn.
Reactivity: How things react to certain chemicals and substances.
A change that occurs when a substance changes composition by forming one or more new substances. (Book def.)
A new substance is formed.
Not reversible by physical means.
Examples of Chemical Changes
Signs of a Physical Change
Any change of a physical property such as size, shape, mass.
Most often it is very easy to see a physical change.
Signs of a Chemical Change
More difficult to detect.
Fizzing or bubbling
Change in color
Production of sound, heat, light, or odor
Why are the eggs experiencing a chemical change?
To separate a mixture do you need a chemical or physical change?
To break down a compound do you need a physical or chemical change?