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**Pictures of Chem Class ^_^
*General Suggestions for Student Pages
*Organic seminar sign-up
*Periodic Table Assignment
*Topic (I) --> Sign-up
*Topic (II) --> Review
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*Unit 8 Topics
Aldehydes and Ketones
Alkenes and Alkynes
Amines and Amides
An overview of molarity problem
Atomic Mass and Avogadro's Hypothesis
atomic number and mass
Balancing Chemical Reaction Equations
Basic Science definitions.
Calculations involving the Mole and the Mass of a Substance and the Volume of a gas
Calculations involving the Mole and the Volume of a gas and the Number of Particles
Certain & Uncertain Digits, Defined Numbers and Accuracy & Precision
Chemical Equations and the Conservation Laws
Chemical families -- by Judy Bai
Classification of matter
Concentration of ions in Solution
Constructing the name of an Ionic Compound
Derived Quantities and Density
Early atomic models
Electrostatic forces, electron shells, Valence electrons and valence of an atom
Energy Changes in Chemical Reactions
Ethers and Carboxylic Acids
History of the period table
How to Classify Atoms and Ions
How to Read a Scale
INTERMOLECULAR FORCES AND BONDING
Introduction to functional groups and Alcohols---Elizabeth
Introduction to organic chemistry and hydrocarbon
Ionization energy, Electron Affinity, Atomic Radius
Isotopes and their mixtures
Lab safety 2
Later atomic models
Lewis Dot Diagrams of Neutral Atoms, Monatomic Ions,and Ionic Compounds
LIine spectra, electron shells and energy level diagrams
Mixing Two Solutions and Making Dilute Solutions
Molar Concentrations and Making up Solutions
Multiple conversions between moles,mass, volume and number of particles
Multiplying & Dividing and Adding and Subtracting with Sig Figs
Naming Hydrates and Naming Compounds Using the Prefix System
Naming Monatomic and Polyatomic Ions
Percent Yield and Purity
Phase Changes--by AnnYU
Phases, the Magic 7 and Chemical Word Equation
polar and nonpolar solvents
SI Units and Metric Unit conversions
Significant Figures & Zeros
Solutions and Solubility Introduction
Solving Problems that Involve Multiple Operations and Sig Figs
Stoichiometery calculation involvingMoles, Mass, Gas volume and Molecules
Stoichiometry Calculations Involving Molar Concentration
Stoichiometry of Excess Quantities
The Conductivity of Aqueous solutions
The Major divisions of the periodic table & Metals Non-metals and semi conductors
The Meaning of Stoichiometry and the Coefficients in a Reaction Equation
The Mole Concept and Finding Molar Mass
The nature of covalenting bonding & Predicting the formula of covalent bonds
The nature of solutions of ions
The Physical separation of substances
THE PHYSICCAL PROPERTIES OF MATTER
The role of Kinetic Energy in Phase Changes
TO DRAW A Lewis dot diagrams of covalent compounds
Types of Chemical Reactions - Combustion (Pt.2) &Summary
Types of Chemical Reactions - First 4 Types
Unbranched Alkanes and their Geometry
When to use each separation method
Writing electron configurations of atoms in full and core notation
Writing electron configurations of ions, and the copper and chromium exceptions
Unbranched Alkanes and their Geometry
is a compound containing only hydrogen and carbon
UNBRANCHED (STRAIGHT CHAIN) ALKANES
An Alkane is a hydrocarbon in which all the carbon atoms are connected by
(1)The name of the Alkane end in
(2)Alkane is also called a
pentane = C5H12 = CH3- CH2-CH2-CH2-CH3 (CH3CH2CH2CH2CH3)
hexane = C6H14 = CH3-CH2-CH2-CH2-CH2-CH3 (CH3CH2CH2CH2CH2CH3)
Draw the full structure and condensed structure for heptane, octane, nonane and decane.
THE GEOMETRY OF ALKANES
All the bonds have equal lengehs and all the H-C-H angles are 109 degree.
Alkanes - 4 atoms = tetrahedral
Methane is the simplest alkane example and shows that four hydrogens bonded to carbon give a tetrahedral geometry
about the carbon.
What is the geometry for each carbon in CH3-CH3? Draw a 3-dimensional
Carbon #1 has 4 atoms attached to it (3 H and 1 C) and carbon #2 has 4 atoms attached to it. Therefore, around each carbon will be tetrahedral . Since 3-D drawings are hard to make on a flat surface as shown by the easy drawings on the upper and middle left. These do not really tell you anything about the 3-D qualities of the molecule.
To make a 3-D drawing on paper, the molecule on the lower left is a good representation. Bonds which "stick" out in front or behind the plane of the paper are indicated with "wedges" or dashed lines. "Thin" lines are in the plane of the paper.
Finally look at the ball and stick model to see how the two tetrahederals centered on each carbon overlap each other.
What is the geometry for each carbon in CH3CH2CH3?
All single bonds are present, therefore each carbon is the center of tetrahedral geometry. To draw the molecule start with C # 2 as the center of a tetrahedron. Add carbons # 1 and 3 as part of the main tetrahedron. Finish with hydrogens on all carbons as further centers of two more tetrahedrons.
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