physical & chemical change

Properties and

Changes of Matter

The Nature of Matter

You can observe matter easily with your senses . . .

rocks, trees, bicycles, air . . . Basically everything
and anything!

Matter is anything that takes up space and has mass.

Examples of Matter:

The only thing that wouldn’t be matter would be
energy (sunlight, heat, electricity).

- no mass or volume so they can’t be matter!

What is matter?

Multiple Choice

What is matter?

• something with no mass or volume

• energy

• anything you can observe

Physical property is a property that can be

easily observed without changing the identity
of the substance.

Physical Properties

Examples:
✔ viscosity
✔ conductivity
✔ malleability
✔ hardness
✔ magnetism

✔ melting point
✔ boiling point
✔ density
✔ color

Fill in the Blanks

name one physical property of a substance...

Examples of Physical Properties

A. Solubility of a substance is
its ability to dissolve.

Example: sugar in water

B. Conductivity is a material’s
ability to allow heat or
electricity to flow.

Examples: metal = high conductivity

wood = poor conductivity

Examples of Physical Properties

C. Malleability of a substance is
its ability to be hammered into a
thin sheet

D. Melting and Freezing pointsare the
temperatures at which a solid becomes a
liquid and a liquid becomes a solid.

E. Density of a substance is a
measure of how close together
its particles are.
Low density = float
High density = sink

Physical Change

A change in the appearance, without changing
the identity of the material.

•Can be reversible, or irreversible

•Substance may seem different, but the
way the atoms link up is the same.

It is a physical change if . . .

✔ It changes shape or size

✔ Or the substance changes phase.
✔It dissolves.

Multiple Choice

A physical change requires...

• A change in the appearance, with changing the identity of the material.

• A change in the appearance, without changing the identity of the material

Chemical property is any ability to produce a

change in the identity of matter.

Chemical Properties

flammability
reactivity

Material’s
ability to burn in
the presence of
oxygen.

How readily a
substance combines
chemically with other
substances.

Examples of chemical properties . . .

Corrosive:
Eating away,
such as a
metal by acid

Chemical Changes

Chemical changes occur when a substance

reacts and forms one or more new
substances.

✔ Formation of a precipitate (solid).

✔ A change in color or odor.

✔ Production of a gas (bubbling).

You know a chemical change has occurred
when there is. . .

✔ Absorb or release energy (gets hot or cold or light is given off).

Fill in the Blanks

A chemical change occurs when a substance

and forms a new substance.

Examples of Chemical Changes:

Burning
Or Combustion:
Color change, odor change,
Produces a gas, gets hot

Corroding:
Color change

Rusting:
Color change

Molding:
Color change

Decaying:
Color change

Digesting:
Color change, odor
Change, produces a
Gas, releases energy

What kind of change is it?

A

Multiple Choice

from previous slide...

• physical

• chemical

What kind of change is it?

B

Multiple Choice

from previous slide...

• physical

• chemical

What kind of change is it?

C

Multiple Choice

from previous slide...

• physical

• chemical

What kind of change is it?

D

Multiple Choice

from previous slide...

• physical

• chemical

What kind of change is it?

E

Multiple Choice

from previous slide...

• physical

• chemical

What kind of change is it?

F

Multiple Choice

from previous slide...

• physical

• chemical