Chem 111 Chp 1

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Chem 111 Chp 1
2010-12-03 18:16:05

Chemistry 111 Chapter 111
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  1. Accuracy
    The closeness of a measurement to the true value.
  2. atoms
    A neutral particle having one nucleus; the smallest representative sample of an element.
  3. chemical change
    A change that converts substances into other substances; a chemical reaction.
  4. chemical property
    The ability of a substance, either by itself or with other substances, to undergo a change into new substances.
  5. chemical reactions
    A change in which new substances (products) form from starting materials (reactants).
  6. compound
    A substance consisting of chemically combined atoms from two or more elements and present in a definite ratio.
  7. conclusion
    A statement that is based on what we think about a series of observations.
  8. data
    The information (often in the form of physical quantities) obtained in an experiment or other experience or from references.
  9. decomposition
    A chemical reaction that changes one substance into two or more simpler substances.
  10. extensive property
    A property of an object that is described by a physical quantity whose magnitude is proportional to the size or amount of the object (e.g., mass or volume)
  11. hypotheses
    A tentative explanation of the results of experiments.
  12. intensive properties
    A property whose physical magnitude is independent of the size of the sample, such as density or temperature.
  13. law
    A description of behavior (and not an explanation of behavior) based on the results of many experiments.
  14. mixtures
    Any matter consisting of two or more substances physically combined in no particular proportion by mass.
  15. molecules
    A neutral particle composed of two or more atoms combined in a definite ratio of whole numbers.
  16. observation
    A statement that accurately describes something we see, hear, taste, feel, or smell.
  17. physical change
    A change that is not accompanied by a change in chemical makeup.
  18. physical property
    A property that can be specified without reference to another substance and that can be measured without causing a chemical change.
  19. Precision
    How reproducible measurements are; the fineness of a measurement as indicated by the number of significant figures reported in the physical quantity.
  20. properties
    A characteristic of matter.
  21. pure substances
    An element or a compound.
  22. Qualitative observations
    Observations that do not involve numerical information.
  23. quantitative observations
    An observation involving a measurement and numerical information.
  24. scientific method
    The observation, explanation, and testing of an explanation by additional experiments.
  25. significant figures
    The digits in a physical measurement that are known to be certain plus the first digit that contains uncertainty.
  26. solution
    A homogeneous mixture in which all particles are of the size of atoms, small molecules, or small ions.
  27. theory
    A tested explanation of the results of many experiments.
  28. uncertainties
    The amount by which a measured quantity deviates from the true or actual value.