KS4 Noble Gases
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Transcript of KS4 Noble Gases
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7/27/2019 KS4 Noble Gases
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Boardworks Ltd 2003
THE NOBLE GASES
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Group 0 the noble gases
Coming after Group 7, you might expect these to be called
Group 8 and in some books they are.
Group 0 is a better name thoughbecause thats what they do!
H
Li
Na
KRb
Cs
Fr
Be
Sc Ti
Mg
V Cr Mn Fe Co Ni Cu Zn Ga Ge Se BrCa KrY Zr Nb Mo Tc Ru Pd Ag Cd In Sn SbSr TeRh
Ba Hf Ta W Re Os Ir Au Hg Tl Pb Bi PoLa AtPt
Ra Rf Db Sg Bh Hs Mt ? ?Ac ?
Al P
N O
S Cl
F Ne
Ar
Rn
I
Si
Xe
He
B C
As
Kr
Ne
Ar
Rn
Xe
He
Gp 0
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Electron Structure and Reactivity
All the elements in this group
have fully occupied outer shells.
They are the least chemically
reactive elements. The stable
arrangement means that thenoble gases do not form
chemical bonds with each other
or other elements.
They are monatomic which
means they exist as individual
atoms.
Ar
Ne
He 2
2,8
2,8,8
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Uses of Noble Gases
You might think that a group of
elements that have almost no
reactions would have few uses.
You would be wrong! They have
many uses, mostly based upon theirability to prevent other (undesirable)
reactions taking place.
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Uses of Helium
- Balloons (big and small).
- Protective gas for growing siliconcrystals in silicon chip manufacture.
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- Rare documents preservation (i.e.US Declaration of Independence).-- Pressurizing agent for liquid fuel
rockets (inert so won't react).
- Coolant for the super-conductorsused in body scanners.
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Uses of Neon
- Fluorescent lights
and neon signs.
- TV tubes.- Neon lasers.
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Uses of Argon
- Used to fill light bulbs because the
filament will not react with argon.
- Used as an inert gas shield for arc
welding and cutting especially metals
easily damaged by oxygen such asaluminium & stainless steel.
- Argon is involved in dating the ages
of rocks by potassium-argon dating.
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Ne
Ar
He
Match the gas with the use
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Patterns: Density!
- There can be few chemical patterns for a group as
unreactive as this.
- There are still trends in physical properties
0.17
0.84
1.66
3.46
5.45
8.9
0
Density g/dm-
3
Rn
Xe
Kr
Ar
Ne
He
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- There are also trends in boiling point.
- Can you predict the B.Pts of Kr Xe and Rn?
-269
-246
-186
-152
-108
-62
-300 -200 -100 0
Boiling Point
C
Rn
Xe
Kr
Ar
Ne
He
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Which isNOT
a true statement about thenoble gases?
A. They contain shells that are full or empty
B. They are monatomic gasesC. They are un-reactive.
D. They are lighter than air
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Which gas is used in normal light bulbs?
A. Helium
B. Neon
C. ArgonD. Krypton
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Which gas is used in airships?
A. Helium
B. NeonC. Argon
D. Krypton
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Which gas is used in red fluorescent lights?
A. Helium
B. NeonC. Argon
D. Krypton
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Which gas is used to provide a shield of
inert gas during arc welding of metals like
aluminium?
A. Helium
B. Neon
C. Argon
D. Krypton