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Welcome to Chemistry II – Day IIIPortland Evening Scholars
Mr. Treothe Bullock – Instructor
Complete - Chapter Review Presentations
Last chance to present for full credit
Build a Molecule Simulation Lab Debrief & Questions
Chemical Naming and Composition - The Language of Chemistry
Formulae & Naming Systems
Practice reading and writing names
Final Project Work time
Be ready to share what you think you will research
It is an option to work with a partner – you will double the components you research on your object
Today’s Goal – Research and build slides I-III
Identify Your specific Object Develop a list of
components / ingredients Choose a component to
focus on Research raw materials
sourcing
Chapter 7 Chemical Formula’s
Be able to read elements and number of atoms
Monatomic Ions Are single charged atoms
Binary Ionic Compounds Use ide at the end of the
element name (Main group elements or Stock system Roman numerals (d block)
(Table 7-1) Naming Binary Ionic
Compounds 2 elements in these
compounds
Naming Binary Molecular Compounds Nomenclature or naming
systems rely on both elements.
The prefix system of naming describes the number of atoms (Table 7-3 & 4)
Some elements have more than one ionic form requiring stock system ID
Polyatomic ions exist and have unique names
(Table 7-2)
Chapter 7 Covalent Network Compounds
These compounds are written in the simplest ratio of elements despite large networks
Acids and Salts Most are either binary (2
elements H & a halogen) or oxyacids (H, O & 3rd nonmetal
element) Table 7-5
Oxidation Numbers Indicates general distribution of
electrons in molecular compound or ion
Rules on p 216
Using Oxidation Numbers for Formulas and Names
Many nonmetals have more than one oxidation state
Table 7-6 and Appendix Table A-15 list common oxidation numbers
2 naming systems exist – prefix and Stock (stock is the oxidation number)
Formula Masses Is the sum of the average
atomic masses of all atoms represented in its formula.
Molar Masses Mass if one mole of a
substance
Chapter 7 Molar Mass as a
Conversion Factor Moles x molar mass =
mass in grams Percentage
Composition Mass of element in
sample of compound / mass of compound x 100 = % element in compound
Calculation of empirical formulas Consists of the symbols for the
elements combined in a compound, with subscripts showing the smallest whole-number ratio of the different atoms in the compound.
Use % composition and determine mass of individual elements – establish a molar ratio
Calculation of Molecular formulas
X (empirical formula) = molecular formula
X (empirical formula mass) = molecular formula mass
Welcome to Chemistry II – Week IIHomework for next week
Complete Chapter 7 review sheets – sections 1 & 2
Remember lab safety sign off if needed. Progress on Final Project far enough to
know you can commit on your object.