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Ch 5: Praxis Biology & General Science: Molecular Structure Basics

About This Chapter

Let us help you review the basics of molecular structures and other matter. The video lessons and self-assessment quizzes can give you the resources you need to successfully take the Praxis II Biology and General Science test.

Praxis Biology and General Science: Molecular Structure Basics - Chapter Summary

The lessons in this chapter can help you understand the states of matter, as well as the properties of water. The concepts covered in this chapter can prepare you for the questions you'll find on the Praxis II Biology and General Science test. These videos go over the following topics:

  • The main properties and states of matter
  • The difference between physical and chemical changes to matter
  • Definition of an atom and electron shell
  • The properties of water
  • Solutions, solvents and solutes
  • The processes of osmosis, diffusion and saturation
  • The laws of thermodynamics

Short and engaging video lessons feature knowledgeable instructors who can explain each topic and relate it to the Praxis II test. Self-assessment quizzes are available to test your learning, and transcripts are included with the videos. You can access additional lesson transcripts if you wish to review topics in greater depth.

Praxis Biology and General Science: Molecular Structure Basics Objectives

The Praxis II Biology and General Science test is used to determine your readiness to teach biology and/or general science at the high school level. Molecular structure basics are included in the molecular and cellular biology portion of the exam, which makes up about 15% of the entire test. The quizzes in each chapter are designed to emulat e the actual questions that you may find on the Praxis II test.

The Praxis II Biology and General Science exam is entirely multiple choice. You will need to answer 120 questions in two hours. The test will require you to define scientific principles and terms, as well as apply your knowledge to scientific situations. Questions about laboratory practices and field work are also included.

8 Lessons in Chapter 5: Praxis Biology & General Science: Molecular Structure Basics
Matter: Physical and Chemical Properties

1. Matter: Physical and Chemical Properties

How are substances identified? There are two major ways we can describe a substance: physical properties and chemical properties. Learn about how chemists use properties to classify matter as either a mixture or a pure substance.

States of Matter and Chemical Versus Physical Changes to Matter

2. 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.

The Atom

3. 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?

The Electron Shell

4. The Electron Shell

You may be familiar with the role of electrons in electrical devices, but did you know that electrons also determine the chemical reactivity of everything around you?

Properties of Water

5. 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

6. 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.

Osmosis, Diffusion and Saturation

7. Osmosis, Diffusion and Saturation

The cells in our bodies are in constant flux through the processes of osmosis and diffusion. Learn about how saturation levels force change, and why we're lucky they do.

The Laws of Thermodynamics

8. The Laws of Thermodynamics

Learn about the first and second laws of thermodynamics. Find out how energy is generated, how it converts from one form to another, and what happens to energy in a closed system.

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Other Chapters

Other chapters within the Praxis Biology and General Science: Practice and Study Guide course

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