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Stoichiometry

Stoichiometry. Devon Bateman. Essential Question. Why is a foot…a foot? King Henry I had a foot 12 inches long. Unit Questions. What are measurements? What do we measure? How do we measure? Why do we measure? How do chemists measure molecules?. Overview. Measurement

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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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