About This Chapter
Pure & Impure Substances - Chapter Summary
With this chapter on pure and impure substances, you can review the law of conservation of mass and methods of separating mixtures. In alignment with the chapter topic, you will also find lessons covering chromatography and solubility curves. By the end of the chapter, you should feel confident and prepared to:
- List properties of a pure substance in chemistry
- Discuss phases where substances on Earth can exist
- Provide examples of anomalous behavior of water when freezing
- Discuss mixtures of elements and compounds
- Recall properties of basic solutions in chemistry
- Detail different layers of the atmosphere
- Explain why water is the universal solvent
- Describe how a Liebig condenser is used
These concise lessons can help you easily understand both pure and impure substances. Depending on your needs, you can either review all the lessons in order, or just go over specific subjects. In addition, the quizzes available for each lesson will ease your mind by confirming your comprehension of the subjects covered.
1. Pure Substance in Chemistry: Definition, Properties & Examples
This lesson introduces the concept of the pure substance. The impact of purity on the physical and chemical properties are discussed and several examples are explored along the way.
2. Phase Change: Evaporation, Condensation, Freezing, Melting, Sublimation & Deposition
Substances on Earth can exist in one of four phases, but mostly, they exist in one of three: solid, liquid or gas. Learn the six changes of phase: freezing, melting, condensation, vaporization, sublimation and deposition.
3. Phase Change: Properties & Causes
Matter exists in different phases, and can change from one phase to another. But how and why does this occur? In this lesson we will explore these concepts, looking at the transitions from solid, to liquid, to gas, and back.
4. The Law of Conservation of Mass: Definition, Equation & Examples
Read about the law of conservation of mass, its role in chemistry, and its importance in the universe. Learn the equation, review examples, and test your knowledge of the material with a short quiz.
5. Creating Mixtures by Combining Elements & Compounds
Do you really know what's in your tap water? It's not just water - it's a mixture of many different things. In fact, most things are mixtures of different elements and compounds that are physically joined together.
6. Basic Solutions in Chemistry: Properties & Examples
Basic solutions are very important components of many different chemical reactions. This lesson provides an introduction to bases, basic solutions, and their properties. Several examples of basic solutions in action are also provided.
7. What is Atmosphere? - Layers, Gases & Pressure
The atmosphere surrounds us wherever we go and is necessary for our survival. This lesson will cover the properties and layers of the atmosphere. After completing the lesson, test your knowledge with a short quiz.
8. Chromatography, Distillation and Filtration: Methods of Separating Mixtures
What are some ways that mixtures can be separated? Watch this video to explore several examples of ways you can separate a mixture into its individual components.
9. Why is Water the Universal Solvent?
Did you know that water is referred to as the ''universal solvent?'' In this lesson, you'll learn what that means. You'll also learn which of water's properties make it the universal solvent.
10. Liebig Condenser: Function & Uses
This lesson will center around the discussion of a specific piece of glassware used in the chemistry lab, called a Liebig condenser. Our primary points of exploration will include how it functions and what it's used for.
11. Solubility and Solubility Curves
Learn what solubility is as well as the definitions of 'saturated,' 'unsaturated' and 'supersaturated.' Learn how to determine the solubility of a substance in water by using a solubility curve. Discover the effects of pressure and temperature on the solubility of liquids, solids and gases.
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