Chemical Quantities

Judith S. de Nuño

Science at Marymount

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Daily at Lunch in the Science Patio

Cyber Office Hours
AIM: teachsci23

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Chapter 7 Questions and Problems

  • 1~2, 7~10, 13~21, 24~27, 31~36, 41~42, 46~48, 50~51, 53, 55~57, 60~62, 68, 76, 83~85, 89
    and p. 190 A~D
  • Answer in complete sentences.....letter answers are insufficient
  • Show all work for problems
  • No Units= No Credit

Chapter 7 Objectives

  • to describe how Avogadro's number is related to a mole of any substance
  • to calculate the mass of a mole of any substance
  • to use the molar mass to converrt between mass and moles of a substance
  • to use the mole to convert among measurements of mass, volume, and number of particles
  • to calculate the percent composition of a substance from its chemical formula or experimental data
  • to derive the empirical formula and the molecular formula of a compound from experimental data

Chapter 7 Outline Framework: Use Concept Summary Page 197 as an aid

  • The Mole: Measurement of Matter
    • What is a mole?
    • Number of particles in a mole
    • Mass of a mole of an element
    • Mass of a mole of a compound
  • Mole~Mass and Mole~Volumen Relationships
    • Molar mass of a substance
    • Mole road map
  • Percent Composition and Chemical Formulas
  • Calculating the percent composition of a compound
    • Using percent as a conversion factor
    • Calculating empirical formulas
    • Calculating molecular formulas

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Chapter 7 Terms:

  • Avogadro's number
  • empirical formula
  • gram atomic mass
  • gram formula mass
  • gram molecular mass
  • molar mass
  • molar volume
  • mole
  • percent composition
  • representative particle
  • standard temperature and pressure (STP)
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Chapter 7 WebLinks

Interactive Periodic Tables


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