Stoichiometry and molecular composition
10 videos
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AP Chemistry - What Is Stoichiometry and Why Does It Matter?
Learn stoichiometry: the math behind chemical reactions. Discover how to calculate reactant amounts and products using mole ratios from balanced equations.
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AP Chemistry - Balancing Chemical Equations: Strategy and Practice
Learn how to balance chemical equations by adjusting coefficients, balancing complex molecules first, and treating polyatomic ions as groups to obey the law of conservation of mass.
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AP Chemistry - Mole Ratios: The Key to Every Stoichiometry Problem
Learn how to use coefficients from balanced equations as mole ratios to solve stoichiometry problems. Master the conversion factor method for reactant-to-product calculations.
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AP Chemistry - Solving a Mass-to-Mass Stoichiometry Problem
Learn the 3-step method for stoichiometry: convert grams to moles, apply mole ratio, then convert back to grams. Includes a worked example with sodium chloride and silver nitrate.
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AP Chemistry - Limiting Reactants and Theoretical Yield
Learn how limiting reactants work in chemistry using a grilled cheese analogy, then calculate which reactant runs out first and determines theoretical yield.
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AP Chemistry - Solving a Limiting Reactant Problem
Learn how to solve limiting reactant problems in chemistry by calculating methanol production from CO and H2, including mole conversions and theoretical yield.
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AP Chemistry - Empirical, Molecular, and Structural Formulas
Learn the three types of chemical formulas: empirical, molecular, and structural. Each reveals different levels of detail about molecules, from simple ratios to full structure.
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AP Chemistry - Calculating Mass Percent Composition
Learn how to calculate mass percent composition from chemical formulas using molar masses. Includes step-by-step example with CaCl2 and common mistake tips.
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AP Chemistry - Finding Empirical Formulas from Percent Composition
Learn how to determine empirical formulas from percent composition by converting mass percentages to moles and finding the simplest whole number ratio of atoms.
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AP Chemistry - Empirical Formula from Combustion Analysis
Learn how to determine a compound's empirical formula using combustion analysis by converting product masses to moles and finding element ratios.