Ch 3: Holt McDougal Modern Chemistry Chapter 3: Atoms: The Building Blocks of Matter

About This Chapter

The Atoms: The Building Blocks of Matter chapter of this Holt McDougal Modern Chemistry Companion Course helps students learn the essential lessons associated with atoms. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Atoms: The Building Blocks of Matter textbook chapter.

How It Works:

  • Identify the lessons in the Holt McDougal Atoms: The Building Blocks of Matter chapter with which you need help.
  • Find the corresponding video lessons within this companion course chapter.
  • Watch fun videos that cover the atoms topics you need to learn or review.
  • Complete the quizzes to test your understanding.
  • If you need additional help, rewatch the videos until you've mastered the material or submit a question for one of our instructors.

Students will learn:

  • The definition, examples and equation of the Law of Conservation of Mass
  • The Law of Definite Proportions and the Law of Multiple Proportions
  • Dalton's, Thomson's, Rutherford's and Millikan's contributions to the early atomic theory
  • The structure of subatomic particles
  • The difference between mass numbers and atomic numbers
  • Isotopes and calculating average atomic mass
  • How Avogadro's number is used in chemistry
  • The definition of molar mass

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4 Lessons in Chapter 3: Holt McDougal Modern Chemistry Chapter 3: Atoms: The Building Blocks of Matter
Test your knowledge with a 30-question chapter practice test
Early Atomic Theory: Dalton, Thomson, Rutherford and Millikan

1. Early Atomic Theory: Dalton, Thomson, Rutherford and Millikan

Imagine firing a bullet at a piece of tissue paper and having it bounce back at you! You would probably be just as surprised as Rutherford when he discovered the nucleus. In this lesson, we are going to travel back in time and discuss some of the major discoveries in the history of the atom.

Atomic Number and Mass Number

2. Atomic Number and Mass Number

Atoms are the basic building blocks of everything around you. In order to really understand how atoms combine to form molecules, it's necessary to be familiar with their structure. In this lesson, we'll dissect atoms so we can see just what really goes into those little building blocks of matter.

Isotopes and Average Atomic Mass

3. Isotopes and Average Atomic Mass

When you drink a glass of water, you are actually drinking a combination of heavy water and light water. What's the difference? Is it harmful? This video will explain the difference between the two types of water and go into detail on the significance of the different isotopes of elements.

Avogadro's Number: Using the Mole to Count Atoms

4. 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.

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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