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.