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Lecture 3

BIOL 1115 Lecture 3: Biology 1115 - Atoms & Molecules

by OneClass2337565 , Spring 2018
2 Pages
29 Views
Spring 2018

Department
Biology
Course Code
BIOL 1115
Professor
Kenneth Nauman
Lecture
3

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ATOMS 3MOLECULES
CHEMISTRY
The study of matter
>
matter -made up of atoms
>
mass
-
measure OF amount of matter in an object
>
element
-
one type of atom
>
ATOM -basic unit of matter
~25 elements are essential to life
>
C. 0,H,Nmake up 96% of living matter
>compound -2's elements
ATOMS
>
proton
-+charged
-
each element has °n 'Ve #Of PROTONS (mass #JNucleus
-#of e
-=#of p(Neutral )
>
Neutrons -neutral
-
ISOTOPES -atoms Of same element w| diff #Of neutrons
°
some are unstable decay of nucleus diff element
radioactive decay
-
give off particles }energy
-
mass #=protons +neutrons
-
atomic weight
-
avg mass of all naturally occurring isotopes
>Electrons
-
vary in amount of nrg they possess
a
electromagnetic -light
e
Kinetic -due to motion -always has
potential -stored in object
-
temperature -measure of the average KE of particles
-
farther back from nucleus -more PEE
-
has
only be at certain distances
changing shells input of energy
°
z-8-8-16
.FULL SHELL not react (valence )

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Description
ATOMS 3 MOLECULES CHEMISTRY The study of matter > matter - made of atoms up > - mass measure OF amount of matter in an object > - element one of atom type > ATOM - basic unit of matter ~ 25 elements are essential to life > C. 0 , H , N make up 96% of matter living > - 's compound 2 elements ATOMS > - + proton charged - each element has n 'Ve # Of PROTONS ( mass # Nucleus - - = J # of e # of p ( Neutral ) > - Neutrons neutral - - ISOTOPES atoms Of same element w| diff # Of neutrons some are unstable decay of nucleus diff element - radioactive decay give off particles } energy - = + mass # protons neutrons - - atomic weight avg mass of all naturally occurring isotopes > Electrons - vary in amount of nrg they possess a - electromagnetic light e - - Kinetic due to motion always has - stored in potential object - - of the of temperature measure average KE particles - - farther back nucleus - more P E E has from be at certain distances only shells of changing input energy - z - 8 - 8 16 . FULL SHELL not react valence ( ) CHEMICAL BONDS > COVALENT BONDS - 2 atoms share a pair of valence electrons fill valence shell - double Or triple bonds - - electro negativities attraction for electrons - C , H , N , O polar diff eiectroneg . ( area w| diff charge ) partial in in low - - high Non polar similar eiectroneg > BONDS IONIC - - electron - e from low . very eg atom strip electron eg - electrical ions charge ( ) . +1 ( loss ) . -1 L ) gain - = attract 2 atoms near ionic bond opposite bring > HYDROGEN BONDS - weak bonds between +120 - 3 ( - H 01N in polar bonds opposites attract weakly )
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