Science Exam

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Science Exam
2010-12-12 16:16:31
PEC Science

Study notes for PEC Science Exams.
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  1. Anything that can change during an experiment is known as an
    independent variable
  2. A system of knowledge based on facts or principals
  3. A good expirament tests __ variable
  4. Is what changes in an experiment because of the independent variable
    dependent variable
  5. Measure of space or capacity of a container. It is measured in
    Volume, cubic meters
  6. Variable that the scientist changes in the experiment
    independent variable
  7. measure of quantity of matter in an object. the base unit is ___.
    Mass, Gram
  8. an answer to your question that can be tested
  9. a systematic way of answering questions or solving problems
    scientific method
  10. used to compare data
    bar graph
  11. used to show change over time
    line graph
  12. used to show parts of a whole
    pie graph
  13. anything that has mass and occupies space
  14. law of conservation of mass states"
    mass is neither created nor destroyed
  15. law of conservation of energy states:
    energy is neither created nor destroyed
  16. change of a substance that occurs without a change in composition
    physical change
  17. substance that cant be broken down into simpler substances
  18. a change that occurs when a substance changes composition by forming one or more new substances
    chemical change
  19. mass per unit volume of a substance or "how much stuff is inside an object"
  20. chemical symbols and letters indicating the atoms contained in the basic unit of a substance
    chemical formula
  21. when a mixture yeilds the same composition throughout
    homogeneous mixture
  22. when a mixture does not uniformly mix
    heterogeneous mixture
  23. attractive force that holds atoms or ions together
    chemical bond
  24. atoms join to form bonds so each element has a
    full outer shell
  25. atom with a positive charge
  26. atom with a negative charge
  27. ion made of two or more atoms that are covalently bonded and that act like a single ion
    polyatomic ion
  28. bond formed when atoms share electrons. they bond a __ to a __.
    covalent bond. nonmetal to a nonmetal
  29. bond formed from a transfer of electrons between oppositely charged ions. they bond __ to __.
    ionic bond/ metals to nonmetals
  30. tiny units that determine the properties of all matter
  31. states that when the elements are arranged by their number of protons, the similarities in their properties will occur in a regular pattern.
    electron configuration
  32. most elements on the periodic table are
  33. any atom that has the same number of protons but a different number of neutrons
  34. horizontal rows are the __. it tells us how many ___ are in an element.
    periods, valence electrons
  35. the center of an atom
  36. vertical column on the periodic table, it tells us how many __ are in an atom
    group, electrons
  37. process of removing or adding electrons to an atom is called
  38. all atoms have a __ charge
  39. number of protons in the nucleus of the atom. it is equal to the number of __ .
    atomic number, electrons
  40. positively charged subatomic particle
  41. negatively charged subatomic particle
  42. subatomic particle with no charge
  43. metallic elements in groups 3- 12 of the periodic table
    transition metals
  44. elements located in group 17 of the periodic table
  45. elements located in group 18 of the periodic table. they are __ or unreactive.
    noble gases, inert.
  46. electron on the outermost energy level
    valence electron
  47. milk is a ___
    homogeneous mixture
  48. apple pie is a ___
    heterogeneous mixture.
  49. tearing a piece of paper is a __.
    physical change
  50. how do you find the number of neutrons in an atom?
    electrons - protons