Course Icon
Chemistry Honors/AP

Chapter 2: 6-10

Course Materials are always under revision! Weblecture content may change anytime prior to two weeks before scheduled chat session for content.

SO Icon

Homework

Molecules, Moles, and Composition Analysis

Chapter 2: Section 10 Homework

Reading Preparation

Textbook assignment: Read Kotz and Triechel, Chemistry and Chemical Reactivity Chapter 2: Section 10.

Study Notes

Important Formulae

Concept Formulae or Notation Explanation
Mass to Moles Conversion moles     grams mole   =   grams

grams     moles grams   =   moles

grams/mole is the molar mass, equal to the atomic weight in grams listed on the periodic table
Percent Composition #   moles   element   mole   of   molecule     molar   mass   of   element mole   of   element   =   grams   of   element mole   of   molecule molar mass = grams/mole of element
Mass percent of element in compound mass   percent   =   grams   of   element    molar   mass   of   compound The percent masses for all elements in the compound should add up to 100%.

Web Lecture

Read the following weblecture before chat: Atoms, Molecules, and the Mole

Study Activity

Videos for Chapter 2

  • Understand how chemical formula are written, and how common chemical compounds are named, as well as common organic compounds.
  • General notes:

    Be sure that you work through all the examples and understand them, and read the problem-solving tips! The more foundation work you lay now, the less trouble you will have later on.

    If you've never seen Coulomb's Law before (p. 78), don't be confused by the format here; it is really a simple relationship that says the force between two charges is equal to the product of the charges (q1*q2) divided by the square of the distance between them, and multiplied by a constant that depends on the units we use to measure the charge and distance: Fe= kQq/r2. It's similar to the inverse square law that governs gravity and for the same reason: we have a point source for the force.

    Chat Preparation Activities

    Chapter Quiz


    Lab Work

    Develop your skills with distillation and recrystallization techniques. Working with your teacher and teammates, design a lab to extract a target component from a solution or mixture.

    References: Illustrated Guide to Home Chemistry Experiments [Required text], or Home School Chemistry Kit Manual which comes with the Home Scientist Chemistry Kit CK101 set and is available online at The Home Scientist.

    You may find some of the basic lab skills described in Lab Techniques 1: weighing samples, filtering solutions, and cleaning equipment and Lab Techniques 2: Reading thermomenters, handling hot equipment, using the Q test useful as well.