About This Chapter
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.
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.
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.
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. 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.
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.
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.
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.
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.
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.
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.
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.
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.
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Other chapters within the AQA A-Level Chemistry: Practice and Study Guide course
- AQA A-Level Chemistry: Atomic Structure
- AQA A-Level Chemistry: Bonding
- AQA A-Level Chemistry: Periodicity
- AQA A-Level Chemistry: Basics of Organic Chemistry
- AQA A-Level Chemistry: Energetics
- AQA A-Level Chemistry: Kinetics
- AQA A-Level Chemistry: Equilibria
- AQA A-Level Chemistry: Redox Reactions
- AQA A-Level Chemistry: Extraction of Metals
- AQA A-Level Chemistry: Haloalkanes
- AQA A-Level Chemistry: Alkenes
- AQA A-Level Chemistry: Alcohols
- AQA A-Level Chemistry: Acids and Bases
- AQA A-Level Chemistry: Carbonyl Group Compounds
- AQA A-Level Chemistry: Aromatic Chemistry, Amines, Amino Acids & Polymers
- AQA A-Level Chemistry: Structure Determination
- AQA A-Level Chemistry: Thermodynamics
- AQA A-Level Chemistry: Transition Metals
- AQA A-Level Chemistry: Reactions of Inorganic Compounds in Aqueous Solution
- AQA A-Level Chemistry: Scientific Investigation
- AQA A-Level Chemistry Flashcards