Chemical & physical
properties
8th Grade Science
Everything is made of chemicals. There are 92
natural chemicals or elements. They are
arranged on the periodic table. Each element is
composed of extremely small particals called
atoms.
All atoms of a given element are
identical. Atoms of different elements
have different properties. Each chemical
has predictable properties that
distinguish or separate it from other
chemicals.
The properties of matter can be grouped
into two categories: physical and
chemical properties.
Physical properties... Describe
what a substance is like or it’s
ability to change in some way but
it still stays the same molecule.
•
Examples:
color
density
odor
melting point
boiling point
hardness
•
What are some physical properties of
vinegar?
smell
its a liquid
clear
taste bitter
Chemical properties...
describe an object/substances’ ability to
change into something new. We use these
properties to distinguish chemicals from one
another.
Ex: Flammability & Reactivity
Some examples of chemical properties
are...
•
paper burns
iron rusts
silver doesn’t react w/water
nitrogen doesn’t burn
In each of these, the substances chemical
property is its tendency to:
•
react
tarnish
corrode
Explode
(bubbles,
Smell)
Physical vs. chemical
properties
•
Wood
Physical Property:
grainy texture
Chemical Property
• Flammable
Baking Soda
Chemical vs. physical
properties
Iron
Physical Property:
Malleable (able
to be shaped)
Chemical Property
• Reacts
with
oxygen to form
rust