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100610 chem a gall
 

100610 chem a gall

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    100610 chem a gall 100610 chem a gall Presentation Transcript

      • Do Now: Look at your Notebook. If pages are not hole-punched and placed in the binder, do that; Portfolios are collected today.
      • Homework: Finish 2 assigned atom models, due Friday.
      • AIMS: TLW continue to apply knowledge of phase changes, kinetic energy, and the structure of the atom.
      • Silently complete Do Now (compile portfolio). Turn in portfolio today, returned on Friday. Copy homework.
      • Review Lesson Steps.
      • Please draw a diagram and describe the process of carbon dioxide solid (dry ice) subliming to form gaseous carbon dioxide- inside a sealed container. Classwork due today.
      • Discuss Homework due today:
            • Pg. 122 #47-51
      • Atomic models- notes
      • Homework assigned:
        • Males: Li, F
        • Females: Ne, B
    •  
      • 47. The atomic number is the number of protons in the atom.
      • 48. How many protons are in the nucleus:
        • phosphorus: 15
        • molybdenum 42
        • aluminum 13
        • cadmium 48
        • chromium 24
        • lead 82
      • 49. What is the diff. betw. the mass # and atomic # in an atom?
      • The atomic number is the number of protons. The mass number is the average sum of the protons and neutrons.
      • For example, Hydrogen has an atomic number of one because it has one proton. Hydrogen only SOMETIMES has a neutron... The average mass of a hydrogen atom is 1.0079 amu.
    • atomic number = 2 atomic mass = 4 Element: Helium Symbol: He
    • Atomic number Mass number Number of protons Number of neutrons Symbol of element 9 19 9 10 F 14 29 14 15 Si 22 47 22 25 Ti 25 55 25 30 Mn
      • 51. Two isotopes differ from each other in the number of neutrons and also in the atomic mass. They have the same number of protons.
      • example: H, Hydrogen, and Deuterium, Which is an atom of Hydrogen with an atomic mass of 2 amu.
      • Hydrogen: 1 proton, 1 electron, NO neutrons
      • Deuterium : 1 proton, 1 electron, 1 neutron
      • Place RED DOTS on the model to represent PROTONS.
      • Place BLACK DOTS on the model to represent NEUTRONS.
      • Place GREEN DOTS on the model to represent ELECTRONS.
      • Homework assigned:
        • females: Li, F-1
        • males: Ne, B+2