Sunday, February 6, 2011

Fri 6/2-Koh

Today we learned how to do limiting reactions.
1. Mr. Tucker showed us how to do Limiting Reactants using the grilled cheese example.
Say you have ten grams of bread and twenty five grams of cheese. How much sandwich would you be able to make? Since ten grams of bread only makes .8 sandwiches (using conversions factors), and since twenty five grams of cheese makes and entire 1.85 sandwiches, (also using simple conversion factors), then we'd only be able to make .8 of sandwiches. We only have enough bread to make .8 sandwiches and the entire 25 grams of cheese would be too much and we'd have excess cheese. This works the same way with molecules. You can't make 2 water molecules with four hydrogen atoms and one oxygen atom. You'd just have one molecule of water and two left-over hydrogen atoms.

2. We went over a limiting reactants sheet. It looked something like this.

3. Lastly we got our quizzes back and took the new one.

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