unit ii - chemistry in this unit we will discuss the elements of the periodic table, how elements...
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Unit II - Chemistry
In this unit we will discuss the elements of the periodic table, how elements combine to make molecules and the properties of elements and compounds
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Today's Starter Quote
Don't put off living to next week, next month, next year or next decade. The only time you’re ever living is in this moment.
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Hydrogen
Symbol : 11 H
Atomic mass : 1 amu Uses: light gas that
can be used as a fuel.
Check out the Video here
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Helium
Symbol : 42 He
Atomic number 2 Uses: lighter than air,
often in balloons
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Lithium
Symbol: 73 Li
Number of protons and electrons: 3
Uses: metal that is very reactive with water; part of some batteries
Video here
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Beryllium
Symbol: 94 Be
Atomic mass: 9 amu Uses: lightweight
parts for missiles and spacecraft
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Boron
Symbol: 115 B
Atomic number: 5 Uses: makes plastic-
like polymers like Silly Putty or burns with an interesting flame as boric acid
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Carbon
Symbol: 126 C
Atomic mass: 12 (used a reference for all matter)
Uses: two forms – graphite in pencils or diamond!
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Nitrogen
Symbol: 147 N
Atomic number: 7 Uses: makes up 78%
of our atmosphere; vital to living organisms
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Oxygen
Symbol: 168 O
Atomic Number: 8 Uses: required for
cellular respiration as O
2; protects Earth
from uv rays as O3
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Fluorine
Symbol: 199 F
Number of electrons: 9
Uses: Reacts violently with everything (even glass)! Check here
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Neon
Symbol: 2010
Ne
Number of protons, electrons and nuetrons: 10
Uses: fluorescent lights (red)
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Sodium
Symbol: 2311
Na
Atomic mass: 23 amu
Uses: reactive with water; component of table salt and ion channels
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Magnesium
Symbol: 2412
Mg
Atomic mass: 24 amu
Uses: welding and old photography equipment
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Aluminum
Symbol: 2713
Al
Uses: foil used for cooking, rims on car wheels
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Silicon
Symbol: 2814
Si
Uses: computer chips, but not silicone – a plastic like substance
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Phosphorus
Symbol: 3115
P
Uses: occurs in 3 forms – white (dangerous!), red and black; found in pyrotechnics
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Sulfur
Symbol: 3216
S
Uses: also known as brimstone; smells just awful
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Chlorine
Symbol: 3517
Cl
Uses: used as one of the first forms of chemical warfare; often used as bleach to disinfect
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Argon
Symbol: 4018
Ar
Uses: Also in fluorescent lights – blue in colour!
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Potassium
Symbol: 3919
K
Uses: part of fertilizer, very reactive with water; found in bananas
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Calcium
Symbol: 4020
Ca
Uses: rare in pure form, but as a compound is key to bones and teeth