BASIC CHEMISTRY
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Transcript of BASIC CHEMISTRY
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BASIC CHEMISTRY
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BASIC CHEMISTRY• ATOMS, ELEMENTS, AND COMPOUNDS
– ATOM• SMALLEST UNIT OF MATTER• CAN NOT BE BROKEN DOWN
BY ANY ORDINARY CHEMICALMEANS
• ONLY ABOUT 100 KINDS OFATOMS
– ELEMENTS• SUBSTANCES MADE OF ONLY
ONE KIND OF ATOM– COMPOUNDS
• TWO OR MORE DIFFERENTKINDS OF ATOMS ARE COMBINED
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BASIC CHEMISTRY
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BASIC CHEMISTRY
• MAJOR ELEMENTS FOR BIOLOGY
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BASIC CHEMISTRY
• STRUCTURE OF ATOMS– SUB-ATOMIC PARTICLES
• PROTONS• NEUTRONS• ELECTRONS
– ATOMIC MODEL• INACCURATE, BUT
HELPS US BESTUNDERSTAND THINGS• ATOMIC NUCLEUS &
ELECTRON ORBITALS
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BASIC CHEMISTRY
• STRUCTURE OF ATOMS– ATOMIC NUMBER• # OF PROTONS
– ATOMIC MASS• # OF PROTONS
+# OF NEUTRONS
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BASIC CHEMISTRY
• STRUCTURE OF ATOMS– ISOTOPES• ATOMS THAT DIFFER
ONLY BY THE # OFNEUTRONS• SAME ATOMIC #,
DIFFERENT ATOMICMASS
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BASIC CHEMISTRY
• RADIOACTIVE ISOTOPES– MANY ISOTOPES ARE UNSTABLE, AND SLOWLY
BREAKDOWN– THE EMISSION OF PARTICLES
DURING THIS BREAKDOWN IS CALLED RADIOACTIVITY
– SCIENCE USES THIS PROCESS FOR HELPFUL TOOLS; RADIOACTIVE DATING (CARBON DATING), RADIOACTIVE DIAGNOSIS, RADIATION THERAPY, ETC.
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BASIC CHEMISTRY
• STRUCTURE OF ATOMS– ELECTRONS• NORMALLY, ATOMS
HAVE THE SAME# OF ELECTRONS ASPROTONS• THEREFORE,
(+) = (-) SO THE ATOMIS NEUTRAL• ELECTRON SHELLS
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BASIC CHEMISTRY
• STRUCTURE OF ATOMS– ELECTRON SHELLS
• A.K.AVALENCE SHELLS
• ATOMS ARE “HAPPIEST”WHEN THEIRELECTRON SHELLS AREFILLED
• ELECTRONS DON’TEXIST ALONE, SOWHERE ARE THEREMORE TO FIND TOFILL SHELLS???
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BASIC CHEMISTRY
• CHEMICAL BONDING– THE FORCE THAT HOLDS ATOMS TOGETHER– TWO MAJOR TYPES– COVALENT BONDING
VS. IONIC BONDING
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BASIC CHEMISTRY
• COVALENT BONDING– CHEMICAL BOND THAT
RESULTS FROM THE SHARING OF ELECTRONS
– ALWAYS RESULTS IN A MOLECULE• TWO OR MORE ATOMS
COMBINE AND ACT AS A SINGLE PARTICLE
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BASIC CHEMISTRY
• IONIC BONDING– CHEMICAL BOND THAT
RESULTS FROM THE TRANSFER OF ELECTRONS BETWEEN ATOMS
– RESULTS FROM THE FORMATION OF IONS• AN ATOM THAT HAS LOST
OR GAINED ELECTRONS, GIVING IT EXCESS ELECTRIC CHARGE
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BASIC CHEMISTRY
• CHEMICAL FORMULA VS. STRUCTURAL FORMULA
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BASIC CHEMISTRY
• CHEMICAL REACTIONS– THE FORMATION OF DIFFERENT SUBSTANCES FROM
THE COMBINATION OF EXISTING ATOMS (MOLECULES)
– REACTANTS VS. PRODUCTS
– *LAW OFCONSERVATION OFMASS*
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BASIC CHEMISTRY
• CHEMICAL REACTIONS– UNBALANCED VS. BALANCED EQUATIONS
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BASIC CHEMISTRY
• CHEMICAL COMPOUNDS VS MIXTURES– COMPOUNDS
• ATOMS, OR IONS, ARE JOINED TOGETHER BY A CHEMICAL BOND
– MIXTURES• SUBSTANCES ARE
PHYSICALLY COMBINED (OR MIXED) WITHOUT FORMING A NEW CHEMICAL BOND
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BASIC CHEMISTRY
• MIXTURES– SOLUTIONS VS SUSPENSIONS VS COLLOIDS
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BASIC CHEMISTRY
• MIXTURES– SOLUTIONS
• HOMOGENEOUS MIXTURE• SOLUTE + SOLVENT =
SOLUTION• SOLVENT
– THE SUBSTANCE THAT MAKES UP THE BULK OF THE SOLUTION
• SOLUTE– SUBSTANCES DISSOLVED
IN THE SOLVENT
• SUSPENSION– A MIXTURE THAT
SEPARATES• COLLOIDAL
DISPERSIONS– MIXTURE THAT IS “IN-
BETWEEN” A SOLUTION AND SUSPENSION
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BASIC CHEMISTRY
• ACIDS, BASES, AND SALTS– SOME OF THE MOST
IMPORTANT COMPOUNDS THAT FORM SPECIAL “SOLUTIONS” WHEN MIXED WITH WATER
• ACID– ANY COMPOUND THAT
PRODUCES [H+] IN SOLUTION
• BASE– ANY COMPOUND THAT
PRODUCES [OH-] IN SOLUTION
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BASIC CHEMISTRY
• ACIDS, BASES, AND SALTS– SOME OF THE MOST
IMPORTANT COMPOUNDS THAT FORM SPECIAL “SOLUTIONS” WHEN MIXED WITH WATER
• NEUTRALIZATION– THE PROCESS OF REACTING
AN ACID AND A BASE TO PRODUCE A NEUTRAL SOLUTION
– RESULTS IN WATER AND SALTS
• SALTS– AN IONIC COMPOUND
PRODUCED BY THE NEUTRALIZATION REACTION N BETWEEN ACID AND BASE
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BASIC CHEMISTRY
• THE pH SCALE
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BASIC CHEMISTRY
• pH SCALE– pH IS THE UNIT WE USE TO MEASURE THE [H+] IN
A SOLUTION– SCALE RANGES FROM 0 – 14 (LOGARITHMIC
SCALE…POWER OF 10)– DIFFERENCE OF 1 pH = 10X DIFFERENCE IN
STRENGTH– BECAUSE WE MEASURE [H+], BASES CAN BE
DEFINED A DIFFERENT WAY!!!
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BASIC CHEMISTRY
• pH INDICATORS– SUBSTANCE THAT CHANGES COLOR BASED ON THE
ACIDITY OR BASICITY OF A SOLUTION
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BASIC CHEMISTRY
• WHY DO WE CARE SO MUCH ABOUT THESE PARTICULAR SUBSTANCES (ACIDS, BASES, SALTS???)
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BASIC CHEMISTRY• WHAT OTHER CHEMICAL
COMPOUNDS ARE ESSENTIAL, OR DIRECTLY EFFECT, LIVING THINGS??
• THAT SHOULD BE THE FOCUS OF OUR NEXT CHAPTER!!!
• OH WAIT…IT IS!!! COME BACK TO FIND OUT MORE