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27 Cards in this Set

  • Front
  • Back
systematic approach to research.
Scientific method
general observations about a system.
Qualitative data
numbers obtained from measurements.
Quantitative data
tentative explanation of observations.
Hypothesis
concise verbal or mathematical statement of relationship that is always the same under the same conditions.
Law
unifying principle that explains body of facts.
Theory
anything that occupies space and has mass.
Matter
study of matter and changes it undergoes.
Chemistry
matter that has definite or constant and distinct properties.
Substance
combination of two or more substances in which the substances retain their own properties.
Mixture
composition the same throughout
Homogeneous
composition is not uniform.
Heterogeneous
substance that cannot be separated into simpler substances.
Element
substance composed of two or more elements chemically united in fixed proportions.
Compound
can be measured and observed w/o changing the composition or identity of substance.
Physical property
any property of a substance that cannot be studied w/o converting the substance into some other substance.
Chemical property
depends on how much matter is being considered.
Extensive property
does not matter how much matter is being considered.
Intensive property
can be determined directly.
Macroscopic properties
must be determined by an indirect method (on atomic or molecular scale).
Microscopic properties
measure of quantity of matter in an object.
Mass
force that gravity exerts on an object.
Weight
length cubed (meter)
Volume
volume occupied by on cubic decimeter
Liter
the meaningful digits in a measured or calculated quantity.
Significant figure
how close measurement is to the true value of quantity that was measured.
Accuracy
how closely two or more measurements of the same quantity agree w/one another.
Precision