Ch 2 Flashcards
This chemical causes ______ in marine animals (______)
bioluminescence, aequorin
How many elements are essential to life?
25 of the 92
Life depends on…
Chemical reactions
What elements makes up 96% of living matter?
HCON
What elements account for the other 4%?
P, Ca, S, K
An element can be broken down into another substance. T or F?
F
Atomic #
of protons
Atomic #
of protons
Atomic mass
Protons + neutrons
Outside shell
Valence shell
Outside shell
Valence shell
All shells participate in chemical rxns
F; only valence shell
Cation
Atom with a net positive charge, has more protons than electrons in the valence shell
Cation
Atom with a net positive charge, has more protons than electrons in the valence shell
Anion
Atom with net negative charge, more electrons in valence than protons
Octet Rule
Valence shell of HONC
The number of electrons needed is equal to….
Covalent bonds
Electrons shared
Polar vs nonpolar
In polar covalent bonds one atom is more _____ and ____ aren’t equally shared
Partial charge
Partial charge
Electronegativity
Electronegativity
H Bonds
Isotopes
Isotopes
