Information Review
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Transcript of Information Review
Information Review
Have out a scratch piece of paper and a pencil
Write all three chemical equations for each
1. A solution of potassium iodide reacts with a solution of copper(I) nitrate
2. Solutions of silver nitrate and sodium chloride react
Write all three chemical equations for each
1. A solution of potassium iodide reacts with a solution of copper(I) nitrate
2. Solutions of silver nitrate and sodium chloride react
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?
Stoichiometry
The quantitative relationship between the products and reactants in a chemical equation.
It’s this simple
1. Write a balanced chemical equation.2. Compare reactants to products, products to
products, or reactants to reactants using conversions.
Remember your molar road map:
Grams ----------------- Moles
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.
Your Stockroom
You inventory your supplies and total 500 hamburger patties, 600 slices of cheese, and 650 hamburger buns.
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
Problem 2
How many Big Macs can you make with the above ingredients?
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.
Problem 2
How many moles of PbI2 will be produced from 3.2 moles of KI and 4.5 moles of Pb(NO3)2?
Questions?
MolesOne problem with the mole: We have no way of directly measuring moles
We can convert:Grams 1 mol = Moles
Molar Mass
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?
Back to the Big Macs
Problem 3: Which is your limiting factor? In other words, which ingredient will run out first?
Problem 4
How much of each ingredient will be left over?
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?
Using our chemicals:
Problem 3: Which reactant limits how much of the products are produced?
Problem 4
How much of the other reactant is left over?
Problem 5
If 5.06 g of KI is completely reacted, how many grams of Pb(NO3)2 were reacted?