About This Chapter
Reactions - Chapter Summary and Learning Objectives
This chapter is designed to help you understand what happens in a chemical reaction, the process by which atoms and molecules come together to form new chemical substances. These reactions are similar to what might happen during the cooking process and usually occur as a result of energy, pressure, temperature or time. Using clear and concise graphics and explanations, your instructor will show you how scientists use equations and symbols, such as arrows, letters and numbers, to identify the products or results of these reactions.
The second half of this chapter will provide you with information about phase changes, or the process by which temperature transforms substances into gases, liquids or solids. You'll also find out how donating or receiving ions from a chemical solution determines whether a solution is an acid or base. After you've finished watching the tutorials and taking the online self-assessment quizzes, you should be able to:
- Understand why and how chemical reactions occur among atoms
- Identify the main types of chemical reactions
- Name the six categories of phase changes and explain how they occur
- Understand how the pH test is used to classify acids and bases
|Chemical Reactions and Balancing Chemical Equations||Define a chemical reaction, and show how to balance a chemical equation.|
|Reactant Atoms and Molecules||Understand how reactant atoms and molecules interact to form substances with different chemical properties.|
|Phase Change: Evaporation, Condensation, Freezing, Melting, Sublimation and Deposition||Describe what happens when substances condense, evaporate, freeze and melt. Explain the processes of deposition and sublimation.|
|Acidic, Basic and Neutral Solutions||Determine whether a solution is acidic, basic or neutral.|
1. 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.
2. How Chemical Reactions Form New Products
After watching this video, you will be able to explain what a chemical reaction is and how the products can have completely different properties to the reactants. A short quiz will follow.
3. 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.
4. Acidic, Basic & Neutral Solutions: Determining pH
After watching this video, you will be able to explain the difference between acidic, basic, and neutral solutions and explain the concept of pH. A short quiz will follow.
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