Transcript Chemistry Reading Project -

Chemistry Reading
Project -- Silver
3D Group 6 : LIN Lok Kwan(28)
NG Wing Yan(29)
NG Yim Hung(30)
WONG Hoi Ki (33)
Content
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Introduction of ‘Silver’
Reason of choosing this book
About silver
History of silver
The most impressive extract
How silver used in photography
Daily application of silver
Experiment(with conclusion)
How does “Silver” affect our thoughts about chemistry
Our comments
Duty list
Resources
Introduction of ‘Silver’
Author : Salvatore Tocci
 Summary :
 Information of silver
 History of silver (reasons of why silver is
precious)
 Usage of silver
 Some experiments about silver
 Some fun facts about silver
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Why do we choose this book?
Silver is around our daily life
 But we may not know how to use it
 So we want to know more about it
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About silver…
Symbol
Atomic Number
Number of
Protons/Electrons
Number of Neutrons
Classification
Name Origin
Symbol Origin
Ag
47
47
61
Transition Metal
From the Old English
word seolfor (silver)
From the Latin
word argentum (silver)
One of the first five metals discovered and
used by humans. The others were
gold, copper, lead and iron.
 A shiny , bright , grayish , malleable and
ductile metal (only gold is more ductile than it)
 Not easily being corrode or rust ( except
sulfur, nitric acid, hydroiodic acid, chlorine,etc)
 Tarnish easily (when combined with sulfur)
 Comes from ores which found in Earth’s crust
 The best conductor of electricity
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History of silver…
Some 6000 years ago , the ancient Egyptians
wore jewellery made of silver.
 In the late 1850s,miners discovered a huge
supply of argentite in Nevada.
 So much silver was recovered that the huge
supply caused its price to fall.
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In ancient times, one of the main uses of
silver was in making coins.
 The first silver coins were made about
2600 years ago by people living in an area
that is now part of Turkey.
 Today ,only 5 % of the silver that is mined
is used to make coins.
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The most impressive extract…
Silver can be used in many aspects
 For example , jewellery , medicine ,
photography , x-ray , eating utensils ,
serving trays , decorative objects one-way
mirror and coins , etc .
 We most concerned about how silver used
in photography .
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How silver used in photography?
Both photographic film and paper contain
a silver compound.
 When it is struck by light ,the silver in this
compound turns into pure silver and
becomes darker.
 The silvers helps to form the images that
appear on black-and-white film or paper.
 Color prints are also made with the use of
silver,along with dyes that are added.
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Applications of silver in daily life…
Spoon
Food Containers
Jewellery
Iphone case
Door handle
Keyboard skins
One-way mirror
Tabmint
Electricle switches
Experiment Time!
Cleaning the silver coins
Materials :
Aluminum foil
Hot water
(100 °C)
A tarnish coin
Let’s Do It!!!
Baking soda
Step 1
Step 2
Step 3
After a few minutes…
Amazing!
Conclusion of the experiment…
The tarnish-removal method used in this
experiment uses a chemical reaction to
convert the silver sulfide back into silver
 In this experiment, the silver sulfide reacts
with aluminum
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Formula of the reaction
Link of the video about the experiment : https://youtu.be/-DQbttBUi8c
Our comments
This book introduced silver to us in detail
(e.g. history and daily usage etc. )
 Silver seems to be very close to us but we
may not pay much attention to it
 However , after reading this book , we
have learned about silver.
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Duty list
LIN Lok Kwan : Finding book
 NG Wing Yan : Finding photo
 NG Yim Hung : Finding information
 WONG Hoi Ki : Finding experiment’s video
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Resources
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https://www.google.com.hk/search?biw=1280&bih=899&tbm=isch&q=silver+element&revid=840638229&sa=X&ei
=sbUjVY72IIO3mAXe9ICACA&ved=0CCkQ1QIoBA#imgdii=_&imgrc=A_a0wGJUfHyoHM%253A%3BRzlpWNQvt
YBOzM%3Bhttps%253A%252F%252Fnativeamericanjewelrytips.files.wordpress.com%252F2012%252F08%252F
silverbar.jpg%253Fw%253D584%3Bhttps%253A%252F%252Fnativeamericanjewelrytips.wordpress.com%252F2012%
252F08%252F28%252Fwhat-is-my-scrap-sterling-silver-jewelry-worth%252F%3B300%3B300
https://www.google.com.hk/search?q=silver&source=lnms&tbm=isch&sa=X&ei=q7UjVYDRBuG3mQWc6YCoBQ&
ved=0CAgQ_AUoAQ&biw=1280&bih=899