Transcript Silver - Bakersfield College

The Element No. 47
By: Alisha Monsibais
Silver,
Fighting
Bacteria
One Cell
Membrane
at a Time
Silver
47
Atomic Number: 47
Ag
Silver
107.8682
Atomic Weight: 107. 8682
Density: 10.501
Melting Point: 1234.93 K
Boiling Point: 2435 K
State at Room Temp: Solid
Element Classification: Metal
Definition of Silver
The Element Silver is defined as a lustrous
white, ductile, malleable metallic element,
occurring both uncombined and in ores such
as argentite, having the highest thermal and
electrical conductivity of the metals. It is
highly valued for jewelry, tableware, and
other ornamental use and is widely used in
coinage, photography, dental and soldering
alloys, electrical contacts, and printed
circuits.
History of Silver’s Name
>The word silver is from the AngloSaxon word “seolfer”
>The chemical symbol comes from the
Latin word “argentum”, also meaning
silver.
Silver and the U.S.
In 1792, silver assumed
a key role in the United
States monetary system
when the currency was
based on the silver
dollar. Silver was used
for the nation’s coinage
until its use was
discontinued in 1965.
The beginning of the
20th century manifested
an important economic
function for silver, that
of an industrial raw
material.
Common uses of Silver
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Currency
Jewelry
Silver wear
Photographs
Dental Alloys
Electrical Conductor
Why we use Silver for
Silver Wear. . . .
Sterling silver is the most
hygienic metal known to man.
It has actual germ killing
properties. It is also the most
durable art form and the most
economical purchase that can
be made for the home. Sterling
silver grows more beautiful
with the passing years, never
wears out, and can be passed
along as part of a heritage that
grows stronger with passing
generations.
Interesting Compounds
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High capacity batteries
can be made with silver
and zinc and silver and
cadmium.
Sliver nitrate (AgNO3) is
light sensitive and is
used to make
photographic films and
papers.
Silver iodide (AgI) is
used to seed clouds to
produce rain.
→
Silver & Medicine
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Silverlon Bandages are
currently in use by
hospitals such as Johns
Hopkins, the Mayo Clinic,
Northwestern University,
University of Michigan,
and Baylor University as
well as several active
military units in
Afghanistan, Iraq and
Germany.
Interesting Facts
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Pure Silver is the best conductor of heat and electricity of all the
known metals
Silver has superior bactericidal qualities. Small concentrations of
silver or silver salts kill bacteria by chemically affecting the cell
membranes, causing them to break down.
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Silver has the highest degree of optical reflectivity of all elements. A
silver mirror can reflect about 95% of the visible light spectrum.
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Silver can be drawn into a wire finer than a human hair
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We have a federal law which requires that all silver stamped
"sterling" must be 925 parts of pure silver in every thousand parts of
metal. The additional 75 parts out of a thousand are to add stiffness
and durability as pure silver is quite soft.