Physical and Chemical Changes
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Transcript of Physical and Chemical Changes
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Physical and Chemical Changes
Ms. W. Smith-McKenzie
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Warm Up
List as many physicaland chemical properties of theStatue of Libertyas you can intwo minutes.
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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.
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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.
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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.
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Physical Changes• Examples of physical changes include
crumbling paper, chopping wood, and ice melting.
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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
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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.
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Chemical Changes• Examples of chemical changes include
burning, fruit ripening, and reactivity to a substance.
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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
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Name that change:
What type of change is taking place in the following scenarios?
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Physical Change
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Chemical Change
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Physical Change
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Physical Change
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Chemical Change
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Chemical Change
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Chemical Change
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