Physical and Chemical Changes
Ms. W. Smith-McKenzie
Warm Up
List as many physical
and chemical
properties of the
Statue of Liberty
as you can in
two 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.