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24 Cards in this Set

  • Front
  • Back
experiment
an observation of natural phenomena carried out in a controlled manner so that the results can be duplicated and rational conclusions obtained
law
a concise statement or mathematical equation about a fundamental relationship or regularity of nature
hypothesis
a tentative explanation of some regularity of nature
theory
a tested explanation of basic natural phenomena
mass
the quantity of matter in a material
matter
whatever occupies space and can be perceived by our senses
solid
the form of matter chaacterized by rigidity
liquid
the form of matter that is a relatively incompressible fluid
gas
the form of matter that is an easily compressible fluid
physical change
a change in the form of matter but not in its chemical identity
chemical change
a change in which one or more kinds of matter are transformed into a new kind of matter or several new kinds of matter
physical property
a characteristic that can be observed for a material without changing its chemical identity
chemical property
a charaacteristic of a material involving its chemical change
substance
a kind of matter that cannot be separated into other kinds of matter by any physical process
element
a substance that cannot be decomposed by any chemical reaction into simpler substances
compound
a substance composed of two or more elements chemically combined
law of definite proportions
a law stating that pure compound, whatever its source, always contains definite or constant propertions of the elements by mass
mixture
a material that can be separated by physical means into two or more substances
heterogeneous mixture
a mixture that consists of physically distinct parts, each with different properties
homogeneous mixture
a mixture that is uniform in its properties throughout given samples
phase
one of seeral different homogeneous materials present in the portion of matter under study
unit
a fixed standard of measurement
significant figures
the number of digits reported for the value of a measured or calculated quantity, indicating the precision of the value
density
mass per unit volume