chemistry ii beginning of the year warm up. let's see what the sun baked out this summer!
TRANSCRIPT
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Chemistry IIBeginning of the Year
Warm Up
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Let's see what the sun baked out this summer!
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Easy Ones!
• What is the chart thing on the wall?
– Answer: Periodic Table
• Bonus: How is it arranged?
– Answer: By atomic number / by number of protons
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Tell me what else you know about this thing ...
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Other things to know:
• Polyatomic Ions• Naming Compounds• Writing Compound Formulas• Identifying Charges on Ions
• Any of these SCARE you???
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Where to Start??
Our first topic is bonding… so you should remember the following items from Pre-AP or Chemistry I.
If these first five slides made you sick, you are either going to have to study/review/ask for help/wake up your brain, or reconsider your schedule.
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Periodic Trends
What do you remember about Periodic trends?
Did you get it all?
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Periodic Trends
Definition: a pattern of behavior on the periodic table• Defined for a group
• Defined for a period
Some Examples:• Atomic Size: • Electronegativity:• Ionization Energy:
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Periodic Trends Continued…
• Atomic Size- atomic radius• increases down a group, decreases L-R across a period
• Electronegativity- Ability of an atom to attract shared electrons "greed“
• Decreases down a group, Increases L-R across a period
• Ionization Energy- Energy needed to remove electrons from the atom
• Decreases down a group, Increases L-R across a period
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Next Topic: Valence Electrons
What do you remember about Valence Electrons?
Did you get it all?
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Valence Electrons
• Outermost Electron(s)• Control chemical activity• Can be shared• Can be transferred• Loss of electrons = positive ion• Gain of electrons = negative ion• Involved in bonding (sharing, transfer)
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Atomic Models
What do you remember about atomic models?
Did you get it all?
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Atomic Models
• JJ Thomson “Plum Pudding Model”
• Rutherford “Gold Foil Experiment”
• Bohr “orbits, only worked for H”
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Atomic Models continued
• Current Model- Wave Mechanical Model• Mathematical representation• Orbital- area of probability- expect to find electrons• s/p/d/f sublevels• Electron configurations represent mathematical
description
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Electron Configurations
What do you remember about Electron Configurations?
Did you get it all?
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Electron Configurations
• Description of electron arrangement• wave mechanical model• quantum mechanical model
• Orbital- probability zone• Pauli Exclusion Principle: no two electrons can
have the same set of four quantum numbers• Quantum Numbers
• Principle Energy Level• Sublevel- s, p, d, f• Orbital• Spin
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Anatomy of a Standard Electron Configuration
1s2 Principle Energy Level:
Tells distance from nucleusRelative amount of energyNumber of sublevels in the P.E.L.
Number of electrons in the sublevel
Sublevel:Tells shape of orbitalIndicates how many electrons may be helds - 2 electrons
max.p- 6 electrons max.d- 10 electrons max.f- 14 electrons max.
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Abbreviated Configurations
• Start with the previous noble gas in brackets
[He] 2s2 2p4
Previous noble gas symbol placed in brackets
Continue with electron configuration from noble gas on
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Orbital Diagrams
• Show the fourth quantum number- spin
1s 2s 2p
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Practice Electron Configurations• Magnesium- atomic #12
– Standard configuration
– Abbreviated configuration
– Orbital diagram
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You should remember what you learned in Chemistry I or Pre AP !
If you do not, the items you will need most right now are:
• recognize polyatomic ions (names, formulas and charges)• write formulas for compounds, write names for formulas• describe basic workings/organization of periodic table
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Later you will need:
• describe parts of a chemical equation : reactant, product, coefficients
• describe basic parts of a solution: solvent, solute, concentration (molarity)
• describe acids and bases
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Assignment
• Electron Configuration Practice Worksheet
• Answer Key Page 1• Answer Key Page 2