Chem 110 Lecture test 1.txt

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Chem 110 Lecture test 1.txt
2010-09-28 21:58:53
Chem Lecture Test

Chemistry Lecture Test 110
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  1. Define Chemistry.
    The Study of matter and its changes.
  2. Define Scientific Method.
    Steps in solving a problem following steps. 1. COllect data 2. Formulate Hypothesis 3. Plan experiments to test hypothesis 4. Modify hypothesis
  3. Define Hypothesis.
    is a tentative explanation of certain facts. An educated guess.
  4. Define Theory.
    A well establish hypothesis.
  5. Define Scientific laws.
    Are simple statements of natural phenomena to which no exceptions are known under the given conditions.
  6. Define Matter.
    Anything that has mass
  7. Define Solid.
    A definite shape and volume, with particles that cling toghether
  8. Define Amorphous.
    Solids that has no definate shape
  9. Define Liquid.
    They have a volume but definete shape
  10. Define Gas
    THey have indefinite volume and no fixed shape
  11. Define Substance
    A specific type of matter with a fix composition
  12. Define Homogeneous
    A subtance that has the same properties throughout
  13. Define heterogeneous
    A subtance that has two or more disticnt phases
  14. Define Phase
    ia a homogeneous past of a system seperated by physical bounderies.
  15. Define System
    The body of matter under consederation.
  16. Define Mixture
    is a material containing two or more substances can be heterogeneous or homogeneous.
  17. What is Sceintific Notion?
    To write a number between 1 to 10 multiplied by 10 raised to some power. Moved right give a negative exponent. Moved to left five a positive exponent.
  18. What is a measurement?
    A quantitive observation
  19. Define significant figures
    Digits used to express a measurement
  20. Equation to convert Fahrenheit to Celsius
  21. Equation to convert Celsius to Fahrenheit
    F=(1.8 x C) + 32
  22. Equation to convert Celsius to Kalvin
    K= C+ 273.15
  23. Define Rounding off numbers?
    Rounding a number up or down depending wheather a number is higher or lower than 5
  24. Define Metric System
    A measuring system based on the standard of 10 units
  25. Define Mass.
    Anything that occupies space
  26. Define Weight
    The effect of gravity on an object
  27. Define Kilogram
    The standard measurement of the metric system (equal to 1000g)
  28. Define Volume
    The amount of space occuppied by matter
  29. Define Litter
    One cubic Decimiter
  30. Define Heat
  31. Define Temperature
    A measure of the intensity of thermal energy, or how hot a system is, regarless of size
  32. Define Density
    Desity= Mass/Volume
  33. Define Specific Gravity
    Specific Gravity= Jesity of a liquid or solid/ density of water (The ration of density of anohter subtance)
  34. Define Element
    Elementary subtance that cannot be broken down by chemical means to a smaller substance
  35. Define Atom
    The smallest particle that an element can exist.
  36. Define Symbols
    Abbreviations of elements
  37. Define Groups
    Elements that has similar of chemical properties
  38. Define Noble Gases
    Gasses and nonreactive
  39. Define Alkali metals
  40. Alkaline Earth Metals
  41. Hologens
  42. Represntative Elements
  43. Transitions Elements
  44. Define Metals
    Solids at room temperature. They have high luster, good conductors of electricity and heat. Can be malleable
  45. Define Nonmetals
    Have low melting point and density, poor conductors,
  46. Define Metalloids
    Elements have properties that are intermidiate between metals and nonmetals
  47. Diatomic Molecules
    Molecutes that always excist with two atoms
  48. What are the Diatomic Molecules
    Hydrogen, Nitrogen, Oxygen, Fluorine, Chlorine, Bromine, Iodine
  49. Define Compound
    A distinct Substance that contains two or more elements chemical bound
  50. Define Molecule
    Is the smallest uncharge individual unit of a compound formed by the union of tow or more atoms
  51. Define Ion
    A positive or negative charge atom
  52. Define Cation
    A positive charge atom
  53. Define Anion
    Negative charge atom
  54. Define Chemical Formula
    Shows the symbal sand the ratio of the atoms in a compound
  55. Define Subcripsts
    Numbers that appear below the line of a symbal