Chemistry Unit 1

  1. Problem statement
    The problem that one tries to solve in the experiment
  2. Hypothesis
    One or more assumptions put forth to explain observed phenomena
  3. Independent Variable
    The variable changed in the experiment
  4. Dependent variable
    The measure of the independent variable
  5. Constant variable
    The variable that stays the same
  6. Control
    The group not being exposed to the variable
  7. Atom
    The fundamental unit of which elements are composed
  8. Compound
    A substance made of two of more different elements joined together in a specific way
  9. Molecule
    A collection of atoms bonded together that behave as a unit
  10. Element
    A substance that cannot be decomposed into simpler substances by chemical or physical means; It consists of all having the same atomic number
  11. Physical property
    Characteristics of a substance that can change without the substances becoming a different substance
  12. Chemical property
    Characteristics that describes the ability of a substance to change to a different substance
  13. Physical change
    A change in the form of a substance that does not affect the composition of a substance
  14. Chemical change
    The change of substances into other substances through a reorganization of the atoms; a chemical reaction
  15. Mixture
    A substance with variable composition
  16. Pure substance
    A substance with pure composition; a pure element or pure compound
  17. Homogeneous mixture
    A mixture that is the same throughout
  18. Solution
    A homogeneous mixture
  19. Heterogeneous mixture
    A mixture that has different properties in different regions of the mixture
  20. Distillation
    A method for seperating the components of a liquid mixture that depends on the different boiling points of the substances
  21. Filtration
    A method for seperating the components of a mixture containing a solid and a liquid
  22. Significant figures
    The certain digits and the first uncertain digit of a measurement
  23. Accuracy
    Getting an answer closest to the accepted answer; normally depends on the instrument used
  24. Precision
    Getting the same answer repeatedly; normally depends on person taking the measurements
Card Set
Chemistry Unit 1