2. How would you describe
yourself so that
someone else could
identify you?
• On a separate sheet of paper,
write as many physical
descriptions of yourself as you
can. Do not put your name on
the paper.
3. Physical Properties
• A property of matter that can be
observed or measured without
changing the identity of the matter.
• Physical properties identify matter.
• Examples include but are not limited to:
• Density
• Malleability
• Ductility
• Solubility
• State
• Thermal Conductivity
4. Physical Properties
• Density
• Amount of mass in a given volume
• A substance is always the same at a given
pressure and temperature regardless of
the size of the sample of the substance.
• The density of one substance is usually
different from that of another substance.
• Density equals mass divided by volume.
• D = m / v
5. Practice
• A bar of copper has a mass of
216 g and a volume of 24 cmᴲ.
• What is the density of copper?
• The volume of a candy bar is 55
cmᴲ. The mass of the candy bar
is 70 g. What s the density of
the candy bar?
6. More Practice
• An ice cube has a volume of 36
cmᴲ. If the ice cube has a mass
of 33.2 g, what is the density of
the ice cube?
• What is the density of water?
7. Still More Practice
• At 4⁰C, pure water has a density
of 1 g/mL (1 g/cmᴲ). Suppose
that you have 2 liters of pure
water at this temperature.
What is the mass of this water?
What is the mass of ethyl alcohol
that
8. And Yet, Two More : )
• What is the mass of ethyl alcohol
that exactly fills a 200.0 mL
graduated cylinder. The density of
ethyl alcohol is 0.789 g/mL.
• What is the volume of a silver
metal that has a mass of 2500.0 g.
The density of silver is 10.5 g/cmᴲ
9. • Malleability
• The ability to be pounded into thin sheets.
• Example:
• Aluminum can be rolled or pounded into
sheets to make foil.
• Ductility
• The ability to be drawn or pulled into a wire
• Example
• Copper in wiring – soldering wires or joints
Physical Property
10. Physical Property
• Solubility
• The ability to dissolve in another
substance.
• Example:
• Sugar or salt dissolve in water
• Three ways to increase solubility
• Heat or make warmer
• Grind or smash
• Stir or mix
11. Physical Property
• State of Matter
• The physical form in which a
substance exists at room
temperature, such as:
• Solid – matter has a definite shape and
volume
• Liquid – matter takes the shape of its
container and has a definite volume
• Gas – matter changes in both shape and
volume
12. Physical Property
• Thermal Conductivity
• The ability to transfer thermal
energy from one area to another.
• Examples:
• Plastic foam is a poor conductor, so a
hot drink won’t burn your hand.
• The inside of the toaster (hot coils)
13. Chemical Property
• A property of matter that
describes a substance based on
its ability to change into a new
substance with different
properties.
• Combustibility
• Flammability
• Reactivity
• Acids
• Bases
• Oxidation
14. Chemical Properties
Can be observed with your senses.
Are Not as easy to observe as
physical properties
Example:
Flammability – Only when wood
burns
Combustibility – Only when
fireworks explode
Reactivity – Only when iron
Oxidizes (rust)
15. Physical Change
• A change that affects one or more
physical properties of a
substance.
• Do Not form new substances.
• Can often be Undone
• Example Butter on counter can be
placed back in refrigerator.
• Change of State
•Solid to Liquid
•Liquid to Gas
16. Chemical Change
• A change that occurs when one or more
substances are changed into entirely new
substances with different properties.
• Can Not change back under normal
conditions (some can be changed back by
other chemical means)
• Common Examples:
• Reactivity – Oxidation (rust) on a bicycle
• pH (Acid / Base) – Effervescent tablets
• Flammability – Burnt wood
• Combustibility - Fireworks
17. 5 Signs of a Chemical
Change
• The only sure way to know
there has been a chemical
change is the observance of a
new substance formed
• Sometimes that is hard to do, so
look for the signs…….
18. Sign 1 a Chemical Change
• Odor Production-this is an odor
far different from what it should
smell like
• Ex: Rotting eggs, food in fridge,
decomposing flesh
19. 2nd Sign of a Chemical Change
• Change in Temperature
• Exothermic-When energy is
released do during the chemical
change ex: wood burning
20. Change in Temperature
• Endothermic- Energy is
absorbed causing a decrease in
temperature of the reactant
material ex: cold pack in first
aid kit
21. 3rd Sign of a Chemical Change
Change in Color
Ex: fruit changing color when it
ripens, leaves changing color in
the Autumn, dying your hair
22. 4th sign of a Chemical Change
• Formation of Bubbles
• This can indicate the presence
of a gas. Bubbles produced
when boiling water is not a
chemical change.
23. 5th Sign of a Chemical Change
• Formation of a Precipitate
• When two liquids are combined
and a solid is produced
