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Stoichiometry

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Stoichiometry

1. 1. Definitions of Stoichiometry The ratio of moles of one substance to moles of another substance in a balanced chemical equation. The area of mathematics that is concerned with numerical relationships of chemical formulas and chemical equations. The branch of chemistry that quantifies the substances in a chemical reaction. This is a stoichiometric equation: The art of figuring how much stuff you'll make in a chemical reaction from the amount of each reagent you start with. The study of proportional (quantitative) relationships between two or more substances during a chemical reaction.
2. 2. BASIC STOICHIOMETRY Pronounce stoichiometry as “stoy-kee-ah-met-tree,” if you want to sound like you know what you are talking about, or “stoyk:,” if you want to sound like a real geek. Stoichiometry is just a five dollar idea dressed up in a fifty dollar name. You can compare the amounts of any materials in the same chemical equation using the formula weights and the coefficients of the materials in the equation. Rather than thinking in terms of proportions, think in moles and mole ratios, a much more general and therefore more useful type of thinking. A mole ratio is just the ratio of one material in a chemical equation to another material in the same equation. The mole ratio uses the coefficients of the materials as they appear in the balanced chemical equation. In the standard stoichiometry calculations you should know, ALL ROADS LEAD TO MOLES . You can change any amount of any measurement of any material in the same equation with any other material in any measurement in the same equation. That is powerful ! The setup is similar to Dimensional Analysis.
3. 3. STOICHIOMETRY <ul><li>Let's start with how to say this word. Five syllables. STOY-KEE-AHM-EH-TREE. It's a big word that describes a simple idea. Stoichiometry is the part of chemistry that studies amounts of substances that are involved in reactions. You might be looking at the amounts of substances before the reaction. You might be looking at the amount of material that is produced by the reaction. Stoichiometry is all about amounts. All reactions are dependent on how much stuff you have. Stoichiometry helps you figure out how much of a compound you will need or maybe how much you started with. Reactions are dependent upon the compounds involved and how much of each compound is needed. </li></ul>