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Stoichiometry

This educational overview explores the essentials of stoichiometry and the importance of measurements in chemistry. We address fundamental questions like "What are measurements?" and "How do chemists measure molecules?" The mole is defined as a unit for measuring substance quantities, equating to 6.02 x 10^23 particles. Discover how balanced chemical equations resemble recipes, where coefficients from these equations indicate mole ratios and the interactions of reactants and products. Ultimately, learn how accurate measurements enable chemists to analyze chemical reactions effectively.

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Stoichiometry

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  1. Stoichiometry Devon Bateman

  2. Essential Question • Why is a foot…a foot? • King Henry I had a foot 12 inches long.

  3. Unit Questions • What are measurements? • What do we measure? • How do we measure? • Why do we measure? • How do chemists measure molecules?

  4. Overview • Measurement • List examples of measurement • Define purpose of measurement • Explain chemist’s use of the mole • Stoichiometry • Relate stoichiometry to a recipe • Demonstrate mole ratios in balanced equations

  5. What do We Measure and How?

  6. Measurements allow us compare or analyze data. • Therefore, measurements must be reasonable.

  7. How do chemists count molecules? • Can chemists count by measuring? Chemists count using the mole.

  8. Mole: the unit used to measure the amount of a substance • 1 mole = 6.02x1023 particles

  9. Stoichiometry-the study of mole and mass relationships in a chemical reaction http://www.lsua.us/chem1001/stoichiometry/stoichiometry.html

  10. The mass of the reactants must equal the mass of the products. H2 + Cl2 2 HCl

  11. A balanced chemical equation is very similar to a recipe.

  12. Coefficients represent the mole ratiobetween substances. 6 O2 + C6H12O6 6 CO2+ 6 H2O

  13. Example 4 Fe + 3 O2 2 Fe2O3 • It takes 4 moles iron & 3 moles oxygen to produce 2 moles iron (III) oxide.

  14. Conclusion • The mole allows chemists to analyze chemical reactions. • Balanced equations can be treated like recipes. • Amount of ingredients determines the amount of product

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