physical & chemical properties & physical & chemical changes
TRANSCRIPT
![Page 1: Physical & Chemical Properties & Physical & Chemical Changes](https://reader038.vdocuments.net/reader038/viewer/2022102818/56649cdc5503460f949a69d3/html5/thumbnails/1.jpg)
P/C P/C
Physical & Chemical Properties&Physical & Chemical Changes
![Page 2: Physical & Chemical Properties & Physical & Chemical Changes](https://reader038.vdocuments.net/reader038/viewer/2022102818/56649cdc5503460f949a69d3/html5/thumbnails/2.jpg)
Physical Properties
Identification Examples Usually a measurable
characteristic you can observe without changing the chemical formula or composition such as
Density (universal p.p.) Size/Shape Color Temperature of phase changes
Melting point, boiling point, freezing point, condensation point
State of matter, Texture, Hardness, Odor, Conductivity, etc.
Physical Properties of Water Density = 1.0 g/mL Clear Liquid Boils & Condenses @ 100°C Freezes & Melts @ 0°C
Physical Properties of Alcohol Density = .789 g/mL, clear, liquid,
BP/CP = 80°C, MP/FP = -114°C
Physical Properties of Iron Solid, metallic, responds to a
magnet, conducts electricity, melts @1535°C, boils @ 2750°C, etc.
![Page 3: Physical & Chemical Properties & Physical & Chemical Changes](https://reader038.vdocuments.net/reader038/viewer/2022102818/56649cdc5503460f949a69d3/html5/thumbnails/3.jpg)
Physical Changes
Identification Examples A change in appearance
(size, shape, state) without a change in the composition (chemical make up)
Tearing/Breaking Dissolving Phase changes (boiling,
evaporating, condensing, sublimating, depositing, melting, freezing (solidifying)
Physical Changes in Water Water freezes to form ice Breaking an icicle Boiling water
Physical Changes in Alcohol Evaporates quickly
Physical Changes in Iron Melting iron to pour in a
mold. Magnetizing an iron bar with
a blow or electromagnet.
![Page 4: Physical & Chemical Properties & Physical & Chemical Changes](https://reader038.vdocuments.net/reader038/viewer/2022102818/56649cdc5503460f949a69d3/html5/thumbnails/4.jpg)
Chemical Properties
Identification Examples The ability to react with
other substances Doesn’t mean it has
changed but that it could in the right conditions
Must have been observed reacting in the past to know this
Flammability Corrosivity Toxicity (poisonous) pH Reactvity
Chemical Properties of Water Ability to react with metals to
from bases/corrosion Ability to react with
nonmetals to form acids
Chemical Properties of Alcohol Flammable (ability to burn) Toxic in moderate quantities
Chemical Properties of Iron Ability to rust.
![Page 5: Physical & Chemical Properties & Physical & Chemical Changes](https://reader038.vdocuments.net/reader038/viewer/2022102818/56649cdc5503460f949a69d3/html5/thumbnails/5.jpg)
Chemical Changes
Identification Examples A reaction where new
(different) substances are formed
Can be written as a chemical equation
Evidence a Chemical Change occurs Change in color (without dyes) Change in odor Gas is produced (no heat added) Solids forming from liquids
(precipitate) Spontaneous change in
temperature (no heat added) Light is produced
Chemical Changes in Water Hydrolysis separates water
into hydrogen & Oxygen Water reacting with sodium to
form Sodium Hydroxide and hydrogen gas
Chemical Changes in Alcohol Alcohol burning to form CO2
and H2O and heat
Chemical Changes in Iron Iron combining with oxygen to
from rust (Fe2O3)
![Page 6: Physical & Chemical Properties & Physical & Chemical Changes](https://reader038.vdocuments.net/reader038/viewer/2022102818/56649cdc5503460f949a69d3/html5/thumbnails/6.jpg)
Identification Time
Identify each of the following as either a Physical Property, Physical Change, Chemical Property or a Chemical Change: The color of the desktops are green Zinc has the ability to corrode when wet Moriah broke her bumper when she hit a
deer The food I eat is converted into waste
![Page 7: Physical & Chemical Properties & Physical & Chemical Changes](https://reader038.vdocuments.net/reader038/viewer/2022102818/56649cdc5503460f949a69d3/html5/thumbnails/7.jpg)
Check your lab data & notes Does a spontaneous change in temperature
indicate a physical or chemical change? Which experiments resulted in a temperature change? Which ones were chemical? Physical? Why?
Does a spontaneous change in color indicate a physical or chemical change? Which experiments resulted in a color change? Which ones were chemical? Physical? Why
Does a spontaneous production of gas (bubbling) indicate a physical or chemical change? Which experiments resulted in gas production? Which ones were chemical? Physical? Why?
![Page 8: Physical & Chemical Properties & Physical & Chemical Changes](https://reader038.vdocuments.net/reader038/viewer/2022102818/56649cdc5503460f949a69d3/html5/thumbnails/8.jpg)
Compare/Contrast
Physical v. Chemical Property v. Change