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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 - PowerPoint PPT Presentation
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StoichiometryDevon 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
– 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
WHAT DO WE MEASURE AND HOW?
• Measurements allow us compare or analyze data.
• Therefore, measurements must be reasonable.
• How do chemists count molecules?
• Can chemists count by measuring?
Chemists count using the mole.
• Mole: the unit used to measure the amount of a substance
• 1 mole = 6.02x1023 particles
• Stoichiometry- the study of mole and mass relationships in a chemical reaction
http://www.lsua.us/chem1001/stoichiometry/stoichiometry.html
• The mass of the reactants must equal the mass of the products.
H2 + Cl2 2 HCl
• A balanced chemical equation is very similar to a recipe.
• Coefficients represent the mole ratio between substances.
6 O2 + C6H12O6 6 CO2 + 6 H2O
Example
4 Fe + 3 O2 2 Fe2O3
• It takes 4 moles iron & 3 moles oxygen to produce 2 moles iron (III) oxide.
Conclusion
• The mole allows chemists to analyze chemical reactions.
• Balanced equations can be treated like recipes.
• Amount of ingredients determines the amount of product