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Chapter 3.3

CHEM 1A Chapter Notes - Chapter 3.3: Structural Formula, Covalent Bond, Chemical Formula


Department
Chemistry
Course Code
CHEM 1A
Professor
Arnold Yuan
Chapter
3.3

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Lecture 1: Fine Art
PRE-READING NOTES
3.3 Representing Compounds: Chemical Formulas and Molecular Models
chemical formula – indicates elements in compound, relative number of atoms or ions in
each
- symbol for each element, subscript indicating relative number of atoms of element
- more metallic/positively charged first
-empirical formula – relative number of atoms in each element in a compound
-molecular formula – actual number of atoms of each element in a molecule of a
compound – whole number multiple of empirical formula
-structural formula – use lines to represent covalent bonds, show how molecules
are connected or bonded to each other
ocan depict bond angles, double bonds
ball-and-stick models – represent atoms as balls and chemical bonds as sticks ξƒ  represent
shape of molecule, use color to represent different elements
space-filling molecular models – atoms fill space between each other – represent
estimate of how molecule would actually look
PRE-CLASS ASSIGNMENT
1a. The molecular formula details the elements in the compounds as well as the ratio of
atoms of each element.
1b. The structural formula provides all the information of the molecular formula in
addition to information about which atoms are bonded to each other.
1c. The ball and stick model provides more spatial information about the molecules
because the model is in 3D.
1d. The space-filling models are a more accurate representation of the shape of the
molecule if the molecule were built to visual scale.
2. All are composed of rings of carbon and oxygen. All are made of carbon, oxygen, and
hydrogen. All are nonpolar.
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