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Information Review

This review covers the fundamental concepts of stoichiometry and chemical equations. It details the reactions between potassium iodide and lead(II) nitrate, as well as solutions of silver nitrate and sodium chloride. By examining the coefficients in balanced equations, students can learn how to convert between grams and moles, identify limiting reactants, and determine leftover quantities. Practical applications using Big Mac ingredient inventory illustrate these principles, allowing for a deeper understanding of chemical relationships and practical problem-solving skills in chemistry.

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Information Review

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  1. Information Review Have out a scratch piece of paper and a pencil

  2. Write all three chemical equations for each • A solution of potassium iodide reacts with a solution of copper(I) nitrate 2. Solutions of silver nitrate and sodium chloride react

  3. Write all three chemical equations for each • A solution of potassium iodide reacts with a solution of copper(I) nitrate • Solutions of silver nitrate and sodium chloride react

  4. Concept Review What do the coefficients in a chemical reaction tell you? Is 1 g of substance A equal to 1 g of substance B? How would you convert from grams to moles?

  5. Stoichiometry

  6. The quantitative relationship between the products and reactants in a chemical equation.

  7. It’s this simple • Write a balanced chemical equation. • Compare reactants to products, products to products, or reactants to reactants using conversions. Remember your molar road map: Grams ----------------- Moles

  8. Practical Application You have just purchased the Plateau McDonald’s franchise and are going to make Big Macs. You check the storeroom and see that you have a large surplus of special sauce, lettuce, pickles, and onions. However you have a limited amount of hamburger patties, cheese slices, and buns.

  9. Your Stockroom You inventory your supplies and total 500 hamburger patties, 600 slices of cheese, and 650 hamburger buns.

  10. Problem 1 If each Big Mac has 2 hamburger (Ha) patties, three buns (Bu). And 2 slices of cheese (Ch), write a balanced equation for the formation of a Big Mac from these ingredients using the symbols (Ha, Bu, Ch). 2Ha + 3Bu + 2Ch  1 Ha2 Bu3 Ch2

  11. Problem 2 How many Big Macs can you make with the above ingredients?

  12. Let’s try this using chemicals Problem 1: Write the balanced chemical reaction of a solution of potassium iodide and a solution of lead (II)nitrate.

  13. Problem 2 How many moles of PbI2 will be produced from 3.2 moles of KI and 4.5 moles of Pb(NO3)2?

  14. Questions?

  15. Moles One problem with the mole: We have no way of directly measuring moles We can convert:

  16. One Step Further If 5.06 g of KI and an excess of Pb(NO3)2 were reacted, how many moles of PbI2 would be produced?

  17. Back to the Big Macs Problem 3: Which is your limiting factor? In other words, which ingredient will run out first?

  18. Problem 4 How much of each ingredient will be left over?

  19. Recall the chemicals? Problem 1: Write the balanced chemical reaction of a solution of potassium iodide and lead nitrate. Problem 2: How many moles of PbI2 will be produced from 3.2 moles of KI and 4.5 moles of Pb(NO3)2?

  20. Using our chemicals: Problem 3: Which reactant limits how much of the products are produced?

  21. Problem 4 How much of the other reactant is left over?

  22. Problem 5 If 5.06 g of KI is completely reacted, how many grams of Pb(NO3)2 were reacted?

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