Physical and Chemical
Properties
Unit 2 Lesson 7
Attendance link:
http://goo.gl/forms/JEU4TxaaBg
Expectations
• Required Class Connects
– Tuesday, Wednesday, Thursday
– 10:30 – 11:30 am
•
•
•
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Be active and participate in class.
Be respectful to your classmates
Be positive in the chat box and use it correctly
Have a working microphone!
– You will need it during the lessons and break out rooms.
• If you have a question, please place it in the chat
box and repost it if I don’t see it.
Objectives
• Give examples of physical properties of
substances.
• Give examples of chemical properties of
substances.
• Differentiate physical and chemical
properties of matter.
Properties of
Matter-Words to
Know…
Matter
Anything that has mass
and takes up space!
Mass
• A measure of how much
matter is in an object.
Weight
• A measure of the force of
gravity on an object.
Volume
• The amount of space that
matter occupies.
Density
• The
measurement of
how much mass
of a substance is
contained in a
given volume.
• Mass/Volume
•I
Density
States of Matter
• There are different “states” of matter.
No, not like Texas, Oklahoma, New
Mexico.
• States of matter are also known as
phases (a physical state of matter).
Elements and compounds can move
from one phase to another phase when
special physical forces are present.
• Solid
• Liquid
• Gas
Freezing point
• The temperature at which
a liquid changes into a
solid.
Boiling point
• The boiling point of an
element or compound
means the temperature
at which the liquid form
of an element or
compound is at
equilibrium with the
gaseous form.
• the boiling point of water
is 100 degrees Celsius.
Melting point
• The temperatures
at which the solid
form of the
element or
compound is at
equilibrium with
the liquid form.
• Basically the range
at which the solid
changes its state
•The melting point of
into a liquid.
water is 0 degrees
Celsius
All substances have properties…
Including people!
Example:
People can be
identified by
their …
Face
(shape,
Voice
Height
Finger
prints
Teeth
DNA
expressions)
Eye color Hair color
What are properties?
• Matter has observable and measurable
qualities.
• We can use general properties to identify
substances.
• Two basic types of properties of matter:
Physical properties and Chemical
properties:
Physical Properties
• Physical properties are used to identify,
describe and classify matter.
– Characteristic of a substance that can be
observed (using your senses) without
changing the substance into something
else.
Hardness
Texture
Color
Odor
Taste
Temperature
More EXAMPLES Physical
• size, shape, freezing point, boiling
point, melting point, magnetism,
viscosity, density, luster and many
more.
– Viscosity - The resistance of a liquid to
flowing.
– Examples:
– Low viscosity-water, rubbing alcohol
– High viscosity-honey
6 properties of matter
If you want to ID an unknown substance:
• You can look at density, boiling point, thermal
conductivity, and malleability.
• Why are the volume, length, or ability to rust not
on the list of physical properties to help you ID
what material you’re looking at?
Which of these is a physical
property of wood?
A. Wood can rot
B. Wood can burn
C. Wood does not rust
D. Wood is softer than coal
D
Which of these is a physical
property?
A. Conducts electricity poorly
B. Easy to digest
C. Does not burn
D. Becomes moldy quickly
A
You are given an unknown liquid and asked
to determine its identity. You can measure
only one physical property. You decide to
heat the liquid. You record that the liquid
turns to vapor at 100°C. This demonstrates
which physical property?
A. Melting point
B. Boiling point
C. Ability to conduct electricity
D. Malleability
B
The number of outer shell
electrons determines the
chemical properties of an
element?
True or False
True: it is how the valence electrons behave.
Chemical Properties
• Chemical properties are characteristics
involved when a substance interacts
with another substance to change its
chemical make-up.
Flammability
Rusting
Creating a
Reactivity with
new chemical
water
product
Creating gas
bubbles
pH
Chemical & Physical Changes
• Chemical Change: A new substance is
formed.
– Example: Wood burns an becomes ash. You
can’t get your wood back! Cook an egg, it will
never be “liquid” again.
• Physical Changes: A change to a different
state of matter.
– Example: Change ice to water. You can get ice
back!
Physical Changes:
Water freezes
Fold a piece of paper
Ice melts
Chemical Changes:
Metal oxidizes (oxidize = rust)
Electrons form a bond
Roadkill at the side of the street decomposes
Burning paper
Chemical or Physical Change?
• Write a “C” on the chemical changes.
• Write a “P” on the physical changes.
Chemical or Physical Change?
• Write a “C” on the chemical changes.
• Write a “P” on the physical changes.
Which of these is a chemical
property of iron?
A. It is dense
B. It has a melting point
C. It is hard to bend
D. It becomes rusted
D
Which of these is a chemical
property?
A. Boiling point
B. Flammability
C. Density
D. Solubility
B
Are elements with similar
chemical properties found in the
same period or group on the
periodic table?
A. Period
B. Group
It is group because the all have the same
number of valence electrons.
Which type of property can be
measured w/o changing the
substance into a new
substance?
A. Physical property
B. Chemical property
Physical property: does not change what the
substance is; like cutting a log.
Property
Freezing point
Flammability
Ability to rust
Hardness
Solubility
Malleability
Density
Chemical
Physical
Property
Freezing point
Flammability
Ability to rust
Hardness
Solubility
Malleability
Density
Chemical
Physical
Questions?
Make sure you save the whiteboard!
Go complete this lesson in the OLS.
Assessment is 8 questions.