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6.1 Stoichiometry

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

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6.1 Stoichiometry

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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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