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Ch 2: AQA A-Level Chemistry: Amount of Substance

About This Chapter

Review this Amount of Substance chapter in order to boost your knowledge as you study for the AQA A-Level Chemistry test. Expert instructors explore mole-to-mole ratios, the ideal gas law and more to improve your ability to succeed on the exam.

AQA A-Level Chemistry: Amount of Substance - Chapter Summary

When studying for a test like the AQA A-Level Chemistry assessment, you want to feel confident in your ability to answer any questions you face. This chapter is the perfect studying solution, covering exam topics related to amount of substance so you're prepared to do the following on the day of the exam:

  • Explain how to use ions and atoms to calculate molecular formulas
  • Understand molality and molarity concentration, and describe mole-to-mole ratios and calculations of chemical equations
  • Provide details about mass-to-mass stoichiometric calculations and Avogadro's number
  • Describe the ideal gas law, the gas constant, molar volume and stoichiometry
  • Share how to calculate percent composition and determine empirical formulas
  • Discuss chemical reactions, explain how to balance chemical equations, and share how to use mass spectrometry to solve a chemical formula
  • Demonstrate how to calculate reaction yield and percentage yield from a limiting reactant
  • Discover how to identify molecules through a fingerprinting process

In this chapter are a variety of resources designed to boost your comprehension of amount of substance. In addition to watching video lessons with entertaining visual effects, you can access full transcripts with easy-to-identify vocabulary words. Experts not only teach the lessons, but are available to answer questions you have about any concept you don't fully understand. Self-assessment quizzes can test your comprehension of the subject area. A broader chapter exam is also available to reinforce lesson concepts for you before you take the test.

13 Lessons in Chapter 2: AQA A-Level Chemistry: Amount of Substance
Test your knowledge with a 30-question chapter practice test
Using Atoms and Ions to Determine Molecular Formulas

1. Using Atoms and Ions to Determine Molecular Formulas

In this lesson, you will learn how atoms and ions determine molecular formulas. You will understand how molecular formulas tell information about the type and quantity of atoms involved in a molecule. Lastly, we will discuss how to write a molecular formula for an ionic compound.

Calculating Molarity and Molality Concentration

2. Calculating Molarity and Molality Concentration

Learn the abbreviations and meaning of molarity and molality. Then apply what you have learned by going over some sample calculations with given concentrations.

Mole-to-Mole Ratios and Calculations of a Chemical Equation

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.

Mass-to-Mass Stoichiometric Calculations

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.

Avogadro's Number: Using the Mole to Count Atoms

5. 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.

The Ideal Gas Law and the Gas Constant

6. The Ideal Gas Law and the Gas Constant

Have you ever wondered why the pressure in your car's tires is higher after you have been driving a while? In this lesson, we are going to discuss the law that governs ideal gases and is used to predict the behavior of real gases: the ideal gas law.

Calculating Percent Composition and Determining Empirical Formulas

7. 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.

Chemical Reactions and Balancing Chemical Equations

8. 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.

Molar Volume: Using Avogadro's Law to Calculate the Quantity or Volume of a Gas

9. Molar Volume: Using Avogadro's Law to Calculate the Quantity or Volume of a Gas

Have you ever wondered why a balloon expands when you blow it up? How something as light as air is able to exert a force large enough to inflate a balloon? In this lesson, you will learn about the relationship between the volume of a container filled with a gas and the number of gas particles that container holds. This relationship is known as Avogadro's Law.

Stoichiometry: Calculating Relative Quantities in a Gas or Solution

10. 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.

Calculating Reaction Yield and Percentage Yield from a Limiting Reactant

11. 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.

Using Mass Spectrometry to Find Chemical Formulas

12. Using Mass Spectrometry to Find Chemical Formulas

In this lesson, we discuss how to determine the chemical formula for a molecule from its mass spectrum when we know the precise mass of its molecular ion.

Infrared Spectroscopy & Molecule Identification

13. Infrared Spectroscopy & Molecule Identification

In this lesson we will learn how to read the output from infrared (IR) spectroscopy and how to use it to help identify molecules. We will also learn how IR absorption relates to global warming.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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