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Chapter 2 Section 3; Chemical Properties

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by

Barbara Knight

on 24 September 2013

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Transcript of Chapter 2 Section 3; Chemical Properties

Chemical Properties
Chapter 2, Section 3
Chemical Properties
Chemical properties describe matter based on its ability to change into new matter that has different properties.
How do chemical properties differ from physical properties?
Physical properties do not change matter.
Burning wood: there are two new substances with different properties than the original pieces of wood.
Example
Ash
Smoke
Flammability is a chemical property. It is the ability of a substance to burn
Flammability
Wood, gasoline, hydrogen all have flammability.
The chemical property that describes the ability of two or more substances to combine and form one or more new substances.
Reactivity
Iron is highly reactive with oxygen. When iron is exposed to oxygen, it rusts.
You can observe physical properties without changing them.
To observe the flammability of wood, you would have to light it on fire and burn it.
Chemical vs. Physical
Characteristic properties:
Useful in identifying substances.

Can be physical properties or chemical properties that remain the same no matter what the size of the sample is.
One or more substances are changed into new substances that have new and different properties.
Chemical Changes
Chemical properties of a substance dictate which chemical changes will occur.
The reactivity of iron (chemical property) will let us know which chemical change will occur (rust, a new substance, will form)
Signs of a Chemical Change
Change in color or odor
Production of heat
Sound
Light
fizzing
Foaming
With chemical changes, the identity of the substance changes.
Matter Changes
Changes are usually not reversable, unless you add more chemical changes.
The composition of the substance changes
Page 55 #'s 2-7
Home-Learning
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