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# 100610 chem a gall

## on Oct 14, 2010

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## 100610 chem a gallPresentation 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
• chromium 24
• 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