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27 Cards in this Set

  • Front
  • Back
Dependent variable
variable you observe
independent variable
variable you change
the truth of a statement
pattern statement
summary of your results from your experiment
Scientific model
explains the patterns observed in experimental data
self concistency
reproduce the same results in many trials
someone else can reproduce your data
Characteristic properties
a property dependent on the substance an object is made from
Intrinsic properties
A property dependent on an object but not its composition
Chemical change
involves the formation of a new substance
Physical change
only intrinsic properties are only formed
Homogeneous mixtures
Mixture whose components are not visible
Heterogeneous mixture
Components are visible and can be mechanically seperated
A substance that can be seperated by physical means
pure substance
can not be seperated by physical means
components can be seperated by chemical means
can not be further seperated chemically
smallest units of matter
tiny positively charged center of an atom
negatively charged particle of an atom
precise path
a region of space where an elctron is most likely to be found
Evidence that explains the existence of atoms
Observations of wear and the fact that elements always combine in small whole number ratios
Evidence that explains the existence of electrons
The behavior of cathode rays in magnetic fields and the pinwheel experiment
Evidence that explains the idea that atoms are mostly empty space
The fact that most of the radioactive particles went through suggested atoms, were mostly empty space.
Evidence that explains the idea that electrons travel in orbits
The fact that different elements produce different colors of light lead to the proposal that electrons travel in orbits,
explain 4 properties defined by quantam numbers
size, shape, orientation, spin