About This Chapter
Praxis Biology: Chemical Reactions - Chapter Summary
The lessons in this chapter cover the chemical principles upon which biological processes are dependent. You will study weak acids, weak bases and buffers and learn to write and balance chemical reactions. One lesson explores the factors that can alter a chemical reaction, while another deals specifically with oxidation/reduction reactions. After watching these video lessons, you should be familiar with the following concepts:
- Redox reactions
- Electron carriers
- Writing and balancing chemical reactions
- What are weak acids, weak bases and buffers?
- Factors that can modify the rate of a chemical reaction
- Endothermic and exothermic reactions
Experienced instructors will guide you through these easy-to-follow lessons that include concise summaries of the material covered. Video links allow you to go back and review key topics without re-watching the entire lesson. You can test your knowledge with the quizzes at the end of each lesson as you prepare for the exam.
Objectives of the Praxis Biology: Chemical Reactions Chapter
Many states require that applicants for teacher certification pass the Praxis exams in the subjects they wish to teach. The Praxis Biology: Content Knowledge exam, which screens candidates for secondary school certification in that subject, contains 150 multiple-choice questions. It is available in a paper or computerized form and has a two-hour time limit.
The exam contains six sections, and the topics covered in the Chemical Reactions chapter are in section II, Molecular and Cellular Biology. This section, with 38 questions, makes up approximately 25% of the entire test.
1. Redox Reactions & Electron Carriers in Cellular Respiration: Definitions and Examples
Redox reactions play an important role in cellular respiration. In this lesson, you will see how NAD and FAD are used as electron carriers to temporarily store energy during cellular respiration.
2. 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.
3. 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.
4. 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.
5. Rate of a Chemical Reaction: Modifying Factors
Why are some reactions much faster than others? Is it possible to change how fast a reaction occurs? In this lesson, you will learn what the rate of a chemical reaction is. You will also discover how factors such as temperature, concentration, surface area, and catalysts impact reaction rates.
6. Endothermic and Exothermic Reactions
Explore a chemical reaction at the molecular level. Learn about exothermic and endothermic reactions, what they look like and what happens when they occur. Understand enthalpy and how you can use it to predict whether a reaction will be exothermic or endothermic.
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