Physical and Chemical Changes
Ms. W. Smith-McKenzie
Warm Up
List as many physicaland chemical properties of theStatue of Libertyas you can intwo minutes.
What are Physical and Chemical Changes?
Physical and chemical changes occur when the matter of a substance changes in some type or form.
• These changes can be identified based on the physical or chemical property being observed.
• Mass is not gained or lost during physical and chemical changes.
What are Physical and Chemical Changes?
• Check For Understanding• CFU: Give an example of a physical property
and a chemical property.
• Answer:• Physical properties include color, texture,
ductility, density, solubility, state of matter
• Chemical properties include flammability, reactivity, ability to rust.
Physical Changes• Physical changes occur when there is a change
in the form of a substances; however the chemical composition of the substance remains the same.
• Physical changes can be determined by observing the physical properties of a substances.
Physical Changes• Examples of physical changes include
crumbling paper, chopping wood, and ice melting.
Physical Changes• CFU: John chops a 25 kg log into pieces. He
gathers all of the pieces and puts them on the scale. How much do the pieces weigh?
• A. More than 25 kg• B. Less than 25 kg• C. 25 kg
• Answer: C
Chemical Changes• Chemical changes occur when there is a
change in the chemical composition of the substance. This can happen when two or more substances combine and a new substance is formed with properties and structures differing from the original substances.
• Chemical changes can be determined by observing the chemical properties of a substances.
Chemical Changes• Examples of chemical changes include
burning, fruit ripening, and reactivity to a substance.
Chemical Changes• CFU: How do we know that burning wood is a
chemical change?• A. After the wood is burnt, the ending
substance is still the same (wood).• B. After the wood is burnt, a new substance is
produced (ash, soot) with new properties.• C. The wood looks the same.• Answer: B
Name that change:
What type of change is taking place in the following scenarios?
Physical Change
Chemical Change
Physical Change
Physical Change
Chemical Change
Chemical Change
Chemical Change
Note:• All images included in this PowerPoint are
unlicensed and are part of the public domain.
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