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Percent Composition and Empirical Formulas Episode 13 of Chemistry, 2nd Edition Course

In this lecture, you encounter two "classic" types of chemistry problems and learn the basic characteristics of each. The lecture concludes with several practice problems to help you master the skill of solving percent composition problems.

Running Time

30 mins

Year

2009

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*36* episodes in this series

Episode 1 Introduction and Philosophy

In this first lecture, Professor Cardulla explains how any student can find success in chemistry by cultivating a meaningful understanding of the concepts and quantitative thinking operations that underlie this…

Episode 2 Basic Concepts of Quantitative Reasoning

Introductory chemistry is not mysterious: It requires simple quantitative reasoning that comes naturally to most students. You learn about the types of numbers involved in chemistry and how to solve…

Episode 3 Quantitative Reasoning in Everyday Life

Only a handful of important ideas must be mastered in order to be successful at solving chemistry problems. In this lecture, you review some basic guidelines for approaching any chemistry…

Episode 4 Quantitative Reasoning in Chemistry—Density

Building on the ideas explored in the first three lectures, you examine a fundamental quantitative measurement in chemistry, density, and explore the real-world meaning of this measurement. You then solidify…

Episode 5 The SI (Metric) System of Measurement

Next, you continue to lay a strong foundation for your understanding of chemistry by learning about one of the key tools you'll be using: the International System of Units (SI),…

Episode 6 Converting between Systems of Measurement

Now that you have established an understanding of the SI system, put your knowledge to work as you practice converting units from one system of measurement to another. You hone…

Episode 7 Elements, Atoms, and the Periodic Table

In the next three lectures, you cover some fundamental topics that you'll need before you can launch into your study of chemistry. You examine the basic building blocks of matter--elements…

Episode 8 Ions, Compounds, and Interpreting Formulas

Learn about protons, electrons, and neutrons; how ions are formed from atoms; how these ions can combine to form compounds; and how you can determine the formulas of these compounds.…

Episode 9 Isotopes and Families of Elements

Discover how isotopes, which are different atoms of the same element, can actually differ in their weight because they contain different numbers of neutrons in their nuclei. Also, learn how…

Episode 10 The Mole

One of the most important concepts to master in an introductory chemistry course is the concept of the mole, which provides chemists with a way to "count" atoms and molecules.…

Episode 11 Solving Mole Problems

By solving problems involving moles, you refine the quantitative techniques introduced in earlier lectures while increasing your familiarity with this important chemical value.

Episode 12 Avogadro's Hypothesis and Molar Volume

After mastering the mole, you move on to a related concept: the "molar volume," or the amount of space occupied by one mole. You apply this understanding of molar volume…

Episode 13 Percent Composition and Empirical Formulas

In this lecture, you encounter two "classic" types of chemistry problems and learn the basic characteristics of each. The lecture concludes with several practice problems to help you master the…

Episode 14 Solving Empirical Formula Problems

Continue your consideration of "classic" chemistry problems with a look at empirical formulas, and examine how empirical formulas relate to molecular formulas

Episode 15 Writing and Balancing Chemical Equations

What happens when you combine two or more elements? Through a variety of practice problems, you learn to identify when a chemical reaction has occurred, how to write chemical equations,…

Episode 16 An Introduction to Stoichiometry

What are the quantitative relationships between the substances in a chemical reaction? The study of stoichiometry shows you how to apply your ability to balance equations to solve problems involving…

Episode 17 Stoichiometry Problems

You extend your study of stoichiometry to consider more complex problems involving volume, molecules, and energy.

Episode 18 Advanced Stoichiometry

As you move on to more advanced stoichiometry problems, you see that they can be solved using a very simple approach. You encounter three terms often applied to chemical reactions:…

Episode 19 An Introduction to Molarity

One important idea to master in any introductory chemistry course is the concept of concentration of a solution. Here, you explore this concept, the components that make up a solution,…

Episode 20 Solving Molarity Problems

Extend your understanding of molarity by solving some typical problems encountered in the high school chemistry classroom. To foster your understanding of these problems, you are asked to draw upon…

Episode 21 Advanced Molarity Problems

You are asked to take the concepts you learned about molarity in the last two lectures and apply them to a number of unfamiliar problems. These problems offer an opportunity…

Episode 22 Basic Concepts of Chemical Equilibrium

Continue your study of chemical reactions by examining an important new concept: the equilibrium system. You start by looking carefully at the difference between reactions that "go to completion" and…

Episode 23 An Introduction to the Equilibrium Constant

By tracking and graphing a hypothetical reaction as it approaches a state of equilibrium, you gain a deeper understanding of the essential characteristics of equilibrium systems. Then, you're introduced to…

Episode 24 Interpreting an Equilibrium Constant

Your examination of the equilibrium constant continues. Learn exactly what the numerical value for an equilibrium constant tells and doesn't tell you about an equilibrium system.

Episode 25 Le Chatelier's Principle—Concentration

Before you can solve equilibrium problems, you need to understand what happens to an equilibrium system when conditions are changed. You learn about a fundamental idea--Le Chatelier's Principle--which lays the…

Episode 26 Le Chatelier—Pressure and Temperature

Having established a basic understanding of Le Chatelier's Principle, you explore how this principle plays out in a variety of situations in which an equilibrium system is changed.

Episode 27 An Introduction to Equilibrium Problems

You use your basic understanding of equilibrium systems to try to solve some problems. You tackle two kinds of equilibrium problems: ones in which you are asked to calculate the…

Episode 28 The Self-Ionization of Water

After examining how different substances may behave when dissolved in water, you learn about the self-ionization of water and use this knowledge to solve problems. The lecture ends with a…

Episode 29 Strong Acids and Bases—General Properties

You return to the topic of pH and learn about how pH relates to two kinds of compounds: acids and bases. Through an introductory problem, you explore the relationship of…

Episode 30 Solving Strong Acid and Base Problems

You gain a deeper understanding of acids, bases, and pH by working several sample problems. These exercises help clarify the difference between strong and weak acids and bases and between…

Episode 31 Weak Acids and Bases

Look at weak acids and bases, compounds that are only slightly ionized in water-based solutions. You learn how to solve the "classic" weak acid problem and apply the same approach…

Episode 32 Titrating Acids and Bases

Here, you explore "neutralization": the idea that if you add a base to an acid, it will tend to destroy the properties of the acid, and vice versa. You examine…

Episode 33 Titration Curves and Indicators

Acid-base indicators, which change color when a solution switches from acid to base and back again, provide a striking demonstration of the transformation that occurs during titration. Learn how to…

Episode 34 Solubility Equilibria—Principles, Problems

After learning about equilibrium systems, you move on to a particular type of system: "solubility equlibria," or the equilibria found in saturated solutions of slightly soluble ionic solids. You explore…

Episode 35 Solubility Equilibria—Common Ion Effect

Your study of solubility equilibria continues with some advanced practice problems. Here, you encounter the last major type of equilibrium problem. To solve these problems, you revisit Le Chatelier's Principle…

Episode 36 Putting It All Together

In this final lecture, you tackle problems that require you to pull together all the knowledge you've acquired. Through these challenging problems, you build confidence in your ability to unravel…

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