bellwork 8-29-2014 1.list the topic/s you think you are an expert in and could teach someone else:...
TRANSCRIPT
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Bellwork 8-29-2014
1. List the topic/s you think you are an expert in and could teach someone else:
1. Density (how to calculate and solve)2. Scientists (what they did and found)3. Atomic structure (bohr models, P+, No, e-)4. Isotopes (symbol, naming, mass number, atomic
number locations etc.)
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Review• Take out some notebook paper and a pencil• If you are an expert on a topic, you will be
seeking out someone who is not and help them review for 5 minutes
• There are 4 topics total for the quiz today
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Announcements
• Tutoring – Fridays• Quizzes – Wednesdays
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Homework Collection
1. Bellwork/exit slip2. Density homework (from half sheet)3. Atomic numbers practice4. Bohr model iPad practice5. Bohr model drawings6. Isotope worksheet
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Homework Collection – Honors
1. Bellwork/exit slip2. Density homework (from half sheet)3. Atomic numbers practice4. Bohr model iPad practice5. Isotope worksheet6. Isotope practice (half sheet)7. Average atomic mass practice sheet8. Average atomic mass homework
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Quiz
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Honors: Average Atomic Mass
• Continue working on average atomic mass practice
• You will have 30 minutes to complete the worksheet from Wednesday
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Notes: The Periodic Table
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Organizing the ElementsChemists used the properties of
elements to sort them into groups.
In 1829 J. W. Dobereiner arranged elements into triads – groups of three elements with similar properties– One element in each triad had
properties intermediate of the other two elements
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Mendeleev’s Periodic Table
By the mid-1800s, about 70 elements were known to exist
Dmitri Mendeleev – a Russian chemist and teacher arranged elements in order of increasing atomic mass
Thus, the first “Periodic Table”
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MendeleevHe left blanks for yet
undiscovered elementsWhen they were discovered, he had
made good predictions
But, there were problems :Such as Co and Ni; Ar and K; Te
and I
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A better arrangement
In 1913, Henry Moseley – British physicist, arranged elements according to increasing atomic number
The arrangement used today
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Thinking…
What is one similarity and one difference between Mendeleev’s periodic table and the modern one created by Moseley?
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Arrangement
• The periodic is arranged by groups and periods
• Groups run UP and DOWN• Periods run LEFT and RIGHTNote this on your periodic table that I handed out
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Groups are special
Groups are special because all elements in one group share similar properties or characteristics such as bonding, reactivity etc.
Halogens – salt formers
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Exit Slip 8-28-2014
• What is the difference between groups and periods on the periodic table?
• Why are groups special?
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Bellwork 9-2-2014
1. Get out your own sheet of paper2. Which scientist created the periodic table we
use today? 3. How did he order it (ex. by increasing…)?
**Pass back quizzes **Student data wall
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Objective
• You will be able to describe in words, the general properties associated with specific groups and specific elements within each group.
Example• Given a Bohr model of Sodium, describe its
reactivity based on the number of valence electrons and its group on the periodic table.
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Periodic Table Song
• https://www.youtube.com/watch?v=zUDDiWtFtEM
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Periodic Table Groups
Alkali Metal Video• http
://www.youtube.com/watch?v=cqeVEFFzz7E • Compound Chem– http://www.compoundchem.com/infographics/
• Fill out the note taker on each group using information from the website
• Color in periodic table as instructed ON THE NOTETAKER
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When Finished…
• You will be creating a poster on one of the periodic table groups as a group
• You must include all of the information from your note taker on your periodic table group poster – Be sure to make the elements and the valence
electrons MOST visible on your poster
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Honors – When Finished…
• You will be creating a video with your group on one of the periodic table groups
• This video will be shared with the rest of the class and with the regular sections to help them better understand each group
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Video• Video must be no longer than 3 minutes • Ideas:– Put on a play or skit about the group of elements you are
representing – Create a commercial to sell the group of elements you are
presenting • Must include:– All info from your note taker + any additional information
you research– Research – one piece that you did not understand and
explain it (i.e. alkali metals react with water, how?)– Most important: valence electrons, elements within the
group
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Exit Slip 9-2-2014
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HomeworkPart 1Using Bohr model rules, how many valence (outer shell) electrons are in the elements 1-10 on the periodic table? Ex. Valence electrons:
1 H = 2 He =3 Li =
Part 2Question: what patterns do you notice while figuring these out (give at least 2)?