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Exploring Stoichiometry: Counting in Chemistry

Learn how to count in chemistry using stoichiometry, the method for calculating chemical reactions. Understand units of counting like dozens and moles, and explore the significance of balanced chemical equations. Discover the concept of a mole and its vast scale in chemical calculations. Don't miss the opportunity to delve into the fascinating world of stoichiometry!

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Exploring Stoichiometry: Counting in Chemistry

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  1. 6.1 Stoichiometry Aim: How do we count in chemistry?

  2. Aim: How do we count in chemistry? Do Now • Identify the reactants and products in this reaction equation: 2H2 + O2 2H2O H O O H + H  H H O H O H H

  3. Aim: How do we count in chemistry? Announcements • All Make-Up/Late Work Due Friday! • You must have a passing Lab score!

  4. What are some units for counting? • Dozen = 12 • Gross = 144 (a dozen dozen = 122) • Great Gross = 1726 (a dozen gross = 123) • Ream = 500 • Why do we use these units of counting?

  5. What is Stoichiometry? • Stoichiometry is the method for “counting” in chemistry

  6. Chemical Equations 2H2 + O2 2H2O • Translation: 2 molecules of dihyrogen react with 1 molecule of dioxygen to form 2 molecules of dihydrogen monooxide.

  7. Chemical Equations 2H2 + O2 2H2O • Reactions ALWAYS happens with the same ratio • How do we know? • Can we count the atoms? • No! Atoms are tiny! Your fingernail is Billions and Billions of atoms across!

  8. Moles • Chemists don’t use dozen, that unit is still too small • Instead we use a HUGE unit of counting called a mole • 1 mole = 6.02*1023

  9. How Big is a Mole? • Text Book P. 309

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