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Download Full Midterm Flashcards. Stony.Erster | BIOL 118 - Intro:Cell&Molecular Bio (DIS) and more Quizzes Biology in PDF only on Docsity!
name the 4 atoms that make up most matter
in organisms
hydrogen, carbon, nitrogen, oxygen
TERM 2
how many elements does life require
DEFINITION 2
TERM 3
what are trace elements
DEFINITION 3
elements required in minute amounts
TERM 4
there are how many naturally occurring
elements?
DEFINITION 4
TERM 5
how many natural+artifical elements are
there?
DEFINITION 5
what percent of O, C, H, N makes up the
human body?
O - 65C - 18.5H - 9.5N - 3.
TERM 7
mass of electron is = 1/ _____ of the mass of
proton
DEFINITION 7
TERM 8
atomic number
means
DEFINITION 8
# of protons
TERM 9
atomic mass means
DEFINITION 9
# protons + # neutronsall in "daltons" (amu)
TERM 10
what are isotopse?
DEFINITION 10
atomic forms of the same element with different numbers of
neutrons
what happens to the electron in a nonpolar
covalent bond?
the electron is shared equally. neither atom is polar so
neither pulls the electron closer to it
TERM 17
what is an ion?
DEFINITION 17
an atom that has a chargeusually because the atom was so
polar it stripped an electron or gave it away from another
electron
TERM 18
what are ionic compounds?
DEFINITION 18
a chemical bond resulting from the attraction b/t oppositely
charged ions
TERM 19
what are 2 types of ionic bonds by their
environment?
DEFINITION 19
dry - bonds are strong (salt crystals form)wet - bonds are
weak (salt crystals dissolve in water)
TERM 20
how is a hydrogen bond formed?
DEFINITION 20
when a hydrogen atom covalently bonds to two
electronegative atoms at the same time
what are van der waals
interactions?
the weak attraction from atoms very close together from
fleeting charge differences
TERM 22
what are chemical
reactions?
DEFINITION 22
the making and breaking of chemical bonds
