Physical and Chemical Changes

1
Physical and Chemical Changes
2
Everything that has mass and volume is called
matter.Everything is made of matter
What is matter?
3
Matter has properties

• Two basic types of properties that we can
  associate with matter.
• Physical properties
• Chemical properties

4
What are properties?

• h
• Characteristics used to identify, describe and
  classify matter
• Two basic types of properties of matter are
  Physical properties and Chemical properties

5
Physical Properties

• Characteristic of a substance that can be
  measured/observed (using your senses) without
  changing the substance into something else.

Hardness Texture Color
Odor Taste Temperature
6
More EXAMPLES - Physical

• size, shape, freezing point, boiling point,
  melting point, density, mass, volume, Physical
  State (solid, liquid or gas) magnetism,
  viscosity, density, luster and many more.
• Viscosity - The resistance of a liquid to
  flowing.
• Examples
• Low viscosity-water, rubbing alcohol
• High viscosity-honey

7
Chemical Properties

• Chemical properties are characteristics involved
  when a substance interacts with another substance
  to change its chemical make-up.

Flammability Rusting Creating gas bubbles
Creating a new chemical product Reactivity with water pH
8
Alike? Different?

• Draw a double bubble map in your notes to compare
  and contrast physical and chemical properties.

9
Matter

• Matter is everywhere.
• Matter is anything that takes up space and has
  mass.
• Matter is constantly experiencing both chemical
  and physical changes.

10
Physical Change

• Physical changes occur when matter changes its
  property but not its chemical nature.
• Physical property changes could include a change
  in texture, shape, size, color, volume, mass,
  weight, and density.

11
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

12
Chemical Change

• Chemical changes are changes matter undergoes
  when it becomes new or different matter.
• To identify a chemical change look for signs such
  as, bubbling and fizzing, light production, color
  change with an odor, smoke, and presence of heat.

13
Evidence of a Chemical Change

• Formation of gas
• Formation of precipitate (a solid that results
  from two liquids reacting)
• Change in color
• Change in energy
• Endothermic Absorbs heat energy (gets cold)
• Exothermic Releases heat energy (gets hot)

14
What kind of changes does matter undergo?

• The type of change that occurs in matter depends
  on the type of properties that are changed.
• Physical changes change physical properties only
  
• Chemical changes change chemical properties and
  physical properties

15
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.

16
Is it a chemical or physical change?

• Sugar dissolving in tea

• Chemical Change

• Physical Change

17
OOPS!

• Did it change size, color, shape (Physical
  Change)?
• or
• Did it become different matter (Chemical Change)?

18
Correct!
19
Is it a chemical or physical change?

• Logs burning

• Chemical Change

• Physical Change

20
OOPS!

• Did it change size, color, shape (Physical
  Change)?
• or
• Did it become different matter (Chemical Change)?

21
Correct!
22
Is it a chemical or physical change?

• Breaking water up by separating it into hydrogen
  and oxygen

• Chemical Change

• Physical Change

23
OOPS!

• Did it change size, color, shape (Physical
  Change)?
• or
• Did it become different matter (Chemical Change)?

24
Correct!
25
Is it a chemical or physical change?

• Cutting paper

• Chemical Change

• Physical Change

26
OOPS!

• Did it change size, color, shape (Physical
  Change)?
• or
• Did it become different matter (Chemical Change)?

27
Correct!
28
Is it a chemical or physical change?

• Crushing an aspirin

• Chemical Change

• Physical Change

29
OOPS!

• Did it change size, color, shape (Physical
  Change)?
• or
• Did it become different matter (Chemical Change)?

30
Correct!
31
Is it a chemical or physical change?

• Metal rusting

• Chemical Change

• Physical Change

32
OOPS!

• Did it change size, color, shape (Physical
  Change)?
• or
• Did it become different matter (Chemical Change)?

33
Correct!
34
Is it a chemical or physical change?

• Lighter fluid burning

• Chemical Change

• Physical Change

35
OOPS!

• Did it change size, color, shape (Physical
  Change)?
• or
• Did it become different matter (Chemical Change)?

36
Correct!
37
Is it a chemical or physical change?

• An egg rotting

• Chemical Change

• Physical Change

38
OOPS!

• Did it change size, color, shape (Physical
  Change)?
• or
• Did it become different matter (Chemical Change)?

39
Correct!
40
Is it a chemical or physical change?

• An egg breaking

• Chemical Change

• Physical Change

41
OOPS!

• Did it change size, color, shape (Physical
  Change)?
• or
• Did it become different matter (Chemical Change)?

42
Correct!
43
Writing Activity

• Write a paragraph about the difference between a
  chemical and physical change. Give examples of
  each.