Transcript Document 7914869

Changing Matter
Physical & Chemical Changes
Matter



Matter is everywhere.
Matter is anything that takes up
space and has mass.
Matter is constantly experiencing
both chemical and physical
changes.
What different ways can we describe
these items? Use your 5 senses!
Properties
How we identify something.
Matter has properties
Two basic types of properties that
we can associate with matter.
Physical properties
Chemical properties
Physical Properties
Anything that can be observed without changing
the identity of the substance. (Tends to be
measurable.)
• melting point
• boiling point
• electrical conductivity
• color
• ANY STATE
CHANGE of
MATTER!
•
•
•
•
density
thermal conductivity
ductility
Malleability
Chemical Properties
The way a substance may change or react to form other
substances
•
•
•
•
•
heat of combustion
reactivity with water
PH
Oxidation
Flammability
• Reactivity to other
chemicals
Properties Defined
Luster – shine
Ductility – ability to be stretched/split into a wire
Malleability – ability to be hammered into thin sheets
Solubility – ability to dissolve
Viscosity – resistance to flow
Tarnish – thin layer of corrosion on metals from a
chemical reaction
Flammability – ability to burn or ignite
Reaction – one set of chemicals transforms into
another set of chemicals or substances
Matter can be
changed two ways
Physically
Physical reaction
Physical change
Chemically
Chemical reaction
Chemical change
Physical Changes
Do NOT CHANGE THE TYPE OF
MATTER
Nothing new or different is formed
Could be a change in:
Mass
Size
Volume
Density
Change in state
Color
Shape
Examples of
Physical Changes
Boiling
Freezing
Dissolving
Breaking
Making a mixture
2 or more types of matter (substances)
mixed together
Not in specific amounts
Can be separated physically
Chemical Changes
The composition
of the substance
changes.
The substances present
at the beginning of the
change are not present
at the end; new
substances are formed.
The change cannot be
“undone.”
Picture from
www.chem4kids.com
Chemical Changes
Evidence of a chemical reaction
Formation of gas
Formation of precipitate
Change in color
Change in energy
Endothermic Absorbs heat energy
(gets cold)
Exothermic Releases heat energy
(gets hot)
Chemical Changes
Atoms are re-arranged, NOT
created or destroyed
Law of
Conservation of Matter
Matter is conserved  type of
atoms does not change
Nothing is created or destroyed
Law of
Conservation of Mass
Mass is conserved  amount
of atoms cannot change
Nothing is created or destroyed
Example
How could you PHYSICALLY
change your lab table?
How could you CHEMICALLY
change your lab table?
To Do
Complete the Pink Practice Worksheet.
Check your answers with your
shoulder partner, then your team.
Read through Ch 4 until we go over the
worksheet answers.