Ch 2: Holt McDougal Modern Biology Chapter 2: Chemistry of Life

About This Chapter

The Chemistry of Life chapter of this Holt McDougal Modern Biology textbook companion course helps students learn essential modern biology lessons on the chemistry of life. Each of these simple and fun video lessons is about five minutes long and is sequenced to align with the Chemistry of Life textbook chapter.

How it works:

  • Identify the lessons in the Holt McDougal Modern Biology Chemistry of Life chapter with which you need help.
  • Find the corresponding video lessons within this companion course chapter.
  • Watch fun videos that cover the chemistry 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 relationships among elements, molecules and compounds
  • The atom
  • Covalent bonds
  • Ionic bonds
  • Chemical and physical changes in matter
  • Redox reactions
  • Chemical reactions
  • Catalysts and activation energy
  • The properties of water
  • Solutes, solvents and solutions
  • Acids and bases
  • Weak acids, weak bases and buffers

Holt McDougal Modern Biology is a registered trademark of Houghton Mifflin Harcourt, which is not affiliated with Study.com.

13 Lessons in Chapter 2: Holt McDougal Modern Biology Chapter 2: Chemistry of Life
Understanding the Relationships between Elements, Molecules & Compounds

1. Understanding the Relationships between Elements, Molecules & Compounds

Everything on Earth is made of atoms, and sometimes they combine to form new groups of atoms. The sky is the limit when it comes to these combinations, which account for the vast number of things we find in our natural world.

The Atom

2. The Atom

Tune into this lesson to find out what matters about matter. What exactly is an atom? And, how do the atoms that make up the elements in the periodic table differ from one another?

Chemical Bonds I: Covalent

3. Chemical Bonds I: Covalent

Mom always said that sharing is caring. This lesson will explore how electrons affect the chemical reactivity of atoms and specifically the merits of sharing electrons.

Chemical Bonds II: Ionic

4. Chemical Bonds II: Ionic

Did you know that the scientific name for table salt is sodium chloride? Find out how sodium and chlorine atoms come together to form your favorite seasoning.

States of Matter and Chemical Versus Physical Changes to Matter

5. States of Matter and Chemical Versus Physical Changes to Matter

The world around us is constantly changing. Chemists put those changes into two main categories: physical changes and chemical changes. This lesson will define and provide examples of each.

Redox (Oxidation-Reduction) Reactions: Definitions and Examples

6. Redox (Oxidation-Reduction) Reactions: Definitions and Examples

This short video will explain oxidation-reduction reactions, or redox reactions for short. The focus is on how electrons are transferred during redox reactions. Learn some neat mnemonic devices to help you remember when an atom is oxidizing or reducing.

Chemical Reactions and Balancing Chemical Equations

7. 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.

Basic Properties of Chemical Reactions

8. Basic Properties of Chemical Reactions

Learn how about the various components of a chemical reaction, and how those components function. Use this lesson to understand the basic properties of different kinds of chemical reactions.

Activation Energy and Catalysts

9. Activation Energy and Catalysts

Learn how to define activation energy and how it relates to a reaction's energy. Learn what an activated complex is and where it fits into an activation energy diagram. Discover how a catalyst works to change the activation energy of a reaction and what this means to metabolism in the body.

Properties of Water

10. Properties of Water

Why does ice float? Why can water rise on its own against gravity in a small tube? Find out how these mysterious properties of water can be explained by hydrogen bonds.

Solutions, Solutes, and Solvents

11. Solutions, Solutes, and Solvents

Oh no! Your friend Ben just drank chili oil on a dare, and now his mouth is burning. Should he drink the ice water or vegetable oil to cool his mouth? Quick. Watch this lesson if you aren't sure.

Acids and Bases

12. Acids and Bases

Have you ever wondered how we measure the acidity of liquids? Check out this lesson to see how acids and bases are measured on a pH scale and how they relate to neutral solutions, such as water.

Weak Acids, Weak Bases, and Buffers

13. Weak Acids, Weak Bases, and Buffers

This lesson covers both strong and weak acids and bases, using human blood as an example for the discussion. Other concepts discussed included conjugate acids and bases, the acidity constant, and buffer systems within the blood.

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