About This Chapter
MEGA Chemistry: Chemical Reactions - Chapter Summary
This chapter is designed to simplify the process of studying for the MEGA Chemistry assessment. Get reacquainted with chemical reactions so you're ready for the following on exam day:
- Discussing common chemical reactions and energy change
- Explaining how to write and balance combustion reactions
- Sharing how to write, identify and predict products of decomposition and synthesis reactions
- Defining precipitation reactions and the rate of a chemical reaction
- Analyzing rate constant, rate laws, collision theory and activation energy
- Describing how temperature affects reaction rates
- Providing details about reaction mechanisms and the rate determining step
You can review each lesson as a video, or scroll down to access its full transcript with easy-to-identify vocabulary words. The lessons also feature short quizzes that allow you to test your readiness to answer chemical reactions questions on the exam. To revisit portions of the videos without watching them entirely, you can access timelines with video tags that allow you to identify and skip to key topics.
1. Common Chemical Reactions and Energy Change
This lesson covers the five common types of chemical reactions: combination, decomposition, single-replacement, double-replacement, and combustion. You will learn how to predict what kind of chemical reaction will occur. You'll also explore how matter is conserved, but energy can change.
2. Writing and Balancing Combustion Reactions
Discover what a combustion reaction is as well as what reactants are needed and what products are produced. Learn to write and balance a combustion reaction. Through the concepts of bond energies, learn how to explain why combustion reactions are largely exothermic.
3. Decomposition and Synthesis Reactions
Learn how to write, identify and predict the products of simple synthesis and decomposition reactions. This includes the composition of reactions with oxygen, of two metals, and of metals with nonmetals, as well as the decomposition of metal carbonates, metal chlorates and metal hydroxides.
4. Precipitation Reactions: Predicting Precipitates and Net Ionic Equations
Learn what a precipitate is and predict when it will form in an aqueous chemical reaction, usually a double-replacement reaction. Learn what an ionic equation is, how it differs from a net ionic equation and how to write a net ionic equation.
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. Rate Constant and Rate Laws
Learn what the rate law is and how the rate constant relates to it. Learn what reaction order is and how to determine reaction order when given experimental data containing concentration and reaction rate.
7. Rate of a Chemical Reaction: Effect of Temperature
Learn how temperature affects reaction rates. Discover the rate law as well as how the Arrhenius equation relates to the rate law and predicts the effect of temperature on the rate of reaction.
8. Collision Theory: Definition & Significance
This lesson will define and explain collision theory and explore how it is related to chemical reactions and reaction rates. So if you've ever wondered how two particles combine to form a new product, read on!
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.
10. Reaction Mechanisms and The Rate Determining Step
This lesson explores what a reaction mechanism is and how it relates to the speed of a reaction. You'll discover how to pinpoint the rate-determining step and learn how to write a rate law based on the rate-determining step.
11. Chemical Kinetics, Reaction Rate Constant & Equilibrium Constant
Are formulas, rate constants, and chemical reactions getting you down? Don't worry, this lesson will explain how reaction rate and equilibrium constants are related to chemical reactions.
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Other chapters within the MEGA Chemistry: Practice & Study Guide course
- MEGA Chemistry: Scientific Research & Measurement
- MEGA Chemistry: Historical Developments & Theories
- MEGA Chemistry: Science & Society
- MEGA Chemistry: Properties of Matter
- MEGA Chemistry: Atomic Structure
- MEGA Chemistry: Liquids, Solids & Phase Changes
- MEGA Chemistry: Gas Laws
- MEGA Chemistry: Thermodynamics
- MEGA Chemistry: Chemical Bonding
- MEGA Chemistry: Inorganic & Organic Compounds
- MEGA Chemistry: Chemical Equilibrium
- MEGA Chemistry: Acids & Bases
- MEGA Chemistry: Redox Reactions & Electrochemistry
- MEGA Chemistry: Stoichiometry & Chemical Equations
- MEGA Chemistry: Solutions
- MEGA Chemistry Flashcards