About This Chapter
ORELA Chemistry - Stoichiometry and Chemical Equations - Chapter Summary
This chapter outlines the fundamentals of stoichiometry and could enhance your ability to perform stoichiometric calculations. Some of the included examples will allow you to practice solving stoichiometry problems in four steps or write the ratios for balanced equations. In other lessons, you'll be able to learn more about the use of Avogadro's number and the process of calculating the percent yield of a particular chemical reaction. Watching these online videos before you take the ORELA Chemistry examination might help you with:
- Learning to balance and write chemical equations
- Expanding your understanding of Avogadro's number
- Making mole-to-mole and mass-to-mass calculations
- Describing molar volume and calculating relative quantities
- Exploring limiting reactants and calculating theoretical reaction yield
- Discovering how to determine an empirical formula
- Calculating the formula of a hydrate
Use these animated video lessons to review these topics or to learn new details about stoichiometry and chemical equations. Study at your own pace and use the ask-a-question feature in order to receive personalized support. In addition to video tags for navigating the lessons, you'll find written transcripts and handy worksheets that can be printed and studied in your spare time. The self-assessment quizzes and the practice chapter examination could prepare you for some of the questions on the ORELA Chemistry examination.
ORELA Chemistry - Stoichiometry and Chemical Equations Objectives
The Stoichiometry and Solutions content domain is the fifth and last of the ORELA Chemistry examination's five content domains. Your understanding of stoichiometry and your familiarity with topics such as net ionic equations and limiting reactant yield will be assessed during this domain, which is worth approximately 18% of the entire assessment score. You must adhere to a three-hour-and-45-minute time limit when sitting for the computer-administered examination. There are 150 multiple-choice questions on the overall examination.
1. Chemical Reactions and Balancing Chemical Equations
In this lesson, you'll learn how to balance a chemical reaction equation using the conservation of matter law. You'll also learn how to write both word and formula equations, what the subscripts after a letter mean and what the numbers in front of compounds mean.
2. Avogadro's Number: Using the Mole to Count Atoms
How do we move from the atomic world to the regular world? Because atoms are so tiny, how can we count and measure them? And what do chemists celebrate at 6:02 AM on October 23rd each year? In this lesson, you will be learning how Avogadro's number and the mole can answer these questions.
3. Mole-to-Mole Ratios and Calculations of a Chemical Equation
Learn what a mole ratio is and how to determine and write the mole ratio relating two substances in a chemical equation in this video lesson. Also, learn to make mole-to-mole calculations and solve problems involving moles of substances.
4. Mass-to-Mass Stoichiometric Calculations
Learn how to set up and make mole to mass, mass to mole and mass to mass stoichiometric calculations. Learn how the ratios of moles helps you compare and make calculations. Learn how to relate mole ratios to molar mass.
5. Stoichiometry: Calculating Relative Quantities in a Gas or Solution
In this lesson, learn about molar volume and how to set up and make stoichiometric calculations with gases. Then learn about solution stoichiometry and how to make stoichiometric calculations with solutions.
6. Limiting Reactants & Calculating Excess Reactants
In this lesson, you'll learn what limiting reactant and excess reactant mean and how to determine which reactant is limiting in a chemical reaction when given the amount of each reactant. You'll also discover how to calculate the amount of product produced.
7. Calculating Reaction Yield and Percentage Yield from a Limiting Reactant
Learn what the theoretical yield, actual yield and percent yield are. Given the limiting reactant, learn how to calculate the theoretical reaction yield, which is also known as the ideal reaction yield and percentage yield.
8. Calculating Percent Composition and Determining Empirical Formulas
Learn the difference between the empirical formula and chemical formula. Learn how to calculate the percent composition of an element in a compound. Learn how, if given a percent composition, to determine the empirical formula for a compound.
9. Hydrates: Determining the Chemical Formula From Empirical Data
Learn the definition of a hydrate and an anhydrate in this lesson. Discover how, when given experimental data, you can determine the formula of a hydrate by following simple steps that include finding the moles of hydrate and anhydrate and comparing the two to write the formula.
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Other chapters within the ORELA Chemistry: Practice & Study Guide course
- ORELA Chemistry: Scientific Research & Equipment
- ORELA Chemistry: Interdisciplinary Relationships in Science
- ORELA Chemistry: Properties of Matter
- ORELA Chemistry: Atomic Structure
- ORELA Chemistry: Liquids & Solids
- ORELA Chemistry: Gases
- ORELA Chemistry: Thermodynamics
- ORELA Chemistry: Chemical Bonding
- ORELA Chemistry: Inorganic & Organic Compounds
- ORELA Chemistry: Chemical Reactions
- ORELA Chemistry: Equilibrium
- ORELA Chemistry: Acids & Bases
- ORELA Chemistry: Redox Reactions & Electrochemistry
- ORELA Chemistry: Solutions in Chemistry
- ORELA Chemistry Flashcards