Chemistry Vocab Chap. 2 and Nuclear
Terms
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 alpha particle

two protons and two neutrons bound together and emitted from
the nucleus during some kinds of radioactive decay  beta particle

an electron emitted from the nucleus during some kinds of
radioactive decay  daughter nuclide
 a nuclide produced by the decay of a parent nuclide
 decay series
 a series of radioactive nuclides produced by successive radioactive decay until a stable nuclide is reached
 electron capture

the process in which an inner orbital electron is captured by
the nucleus of its own atom  nuclear fission

a process in which a very heavy nucleus splits into morestable
nuclei of intermediate mass  nuclear fusion

the combining of lightmass nuclei to form a heavier, more
stable nucleus  hypothesis
 a testable statement
 scientific method

a logical approach to solving problems by observing and
collecting data, formulating hypotheses, testing hypotheses, and formulating
theories that are supported by data  system

a specific portion of matter in a given region of space that has been
selected for study during an experiment or observation  theory
 a broad generalization that explains a body of facts or phenomena
 model

an explanation of how phenomena occur and how data or events are
related  conversion factor

a ratio derived from the equality between two different units
that can be used to convert from one unit to the other  derived unit
 a unit that is a combination of SI base units
 SI

(Le SystÃ¨me International dâ€™UnitÃ©s) the measurement system accepted
worldwide  weight
 a measure of the gravitational pull on matter
 density
 the ratio of mass to volume or mass divided by volume
 quantity
 something that has magnitude, size, or amount
 volume
 the amount of space occupied by an object
 accuracy

the closeness of measurements to the correct or accepted value of the
quantity measured  directly proportional

two quantities that give a constant value when one is divided
by the other  indirectly proportional

two quantities that have a constant mathematical
product  precision

the closeness of a set of measurements of the same quantity made in
the same way  significant figure

any digit in a measurement that is known with certainty plus
one final digit, which is somewhat uncertain or is estimated  percent error

a value calculated by subtracting the experimental value from the
accepted value, dividing the difference by the accepted value, and then
multiplying by 100  scientific notation

numbers written in the form M Ã—10n where the factor M is a
number greater than or equal to 1 but less than 10 and n is a whole number