BIOCHEM L1 Flashcards
anything that has mass and occupies space;
can exist in three states: solid, liquid, or gas
MATTER
study of matter and its interactions
CHEMISTRY
Made up of even smaller
structures called subatomic
particles
ATOM
smallest unit of matter that retains original
properties
ATOM
found in central core
of atom (atomic nucleus); positively
charged
protons
Subatomic particles exist in 3 forms: what are these?
protons, neutrons, electrons
found in atomic
nucleus; slightly larger than protons;
no charge
neutrons
– found outside atomic
nucleus; negatively charged
electrons
regions
surrounding atomic nucleus
where electrons exist; each can
hold a certain number of electrons
electron shells
1st electron shell can hold how many electrons?
can
hold 2 electrons
2nd electron shell can hold how many electrons?
can hold 8 electrons
3rd electron shell can hold how many electrons?
can hold 18 electrons but “satisfied” with 8
Each BLANK is made of atoms with same number
of proton
element
The human body is made up of four major elements: QHAT ARE THESE 4 ELEMENT
- hydrogen
- oxygen
- carbon
- nitrogen
equal to sum of all protons and
neutrons found in atomic nucleus
mass number
atom with same atomic number (same number
of protons), but different mass number (different
number of neutrons
isotope
unstable isotopes; high energy or
radiation released by radioactive decay; allows isotope
to assume a more stable form
radioisoitopes
There are 3 basic types of mixtures
suspensions,
colloids, and solutions
mixture containing two or more
components with large, unevenly distributed
particles; will settle out when left undisturbed
suspension
– two or more components with small,
evenly distributed particles; will not settle out
Colloids
two or more components with extremely
small, evenly distributed particles; will not settle out;
contain a solute dissolved in a solvent:
solutions
substance that is
dissolved
solute
substance that
dissolves solute
solvent
is not a physical structure but rather
an energy relationship or attractive force between
atoms
chemical bond
very large molecules composed
of many atoms
macromolecule
represent molecules
symbolically with letters and numbers; show kinds
and numbers of atoms in a molecule
molecular formulas
formed when two or more atoms
from different elements combine by chemical
bonding
compound
– formed by chemical bonding
between two or more atoms of same element
molecule
(for atoms
with 5 or fewer electrons)
states that an atom is most
stable when its valence
electron shell holds 2
electrons
the duet rule
formed when electrons are transferred
from a metal atom to a nonmetal atom; results in
formation of ions: cations and anions
ionic bond
positively charged ion; forms when metal
loses one or more electrons
cation
is a negatively charged ion that forms when a nonmetal gains one or more electrons.
anion
the strongest bond, form when two or more nonmetals share electrons between themselves.
covalent bonds
result when two nonmetals in a molecule with similar or identical electronegativities pull with the same force and share the electrons equally
nonpolar convalent bonds