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Ch 8: NES General Science: Chemical Reactions

About This Chapter

When studying for the NES General Science exam, complete the lessons in this chapter to review calculations for chemical equations. You'll review the types and effects of chemical reactions and how to modify the rate of chemical reactions.

NES General Science: Chemical Reactions - Chapter Summary

Use these lesson videos to improve your understanding of the techniques used to calculate the reactants and products of chemical reactions, the different types and effects of chemical reactions and the modifying factors of chemical reactions. You'll also take a look at energy change in common chemical reactions. On completion of these mobile-friendly lessons, you'll be able to:

  • Differentiate between endothermic and exothermic reactions
  • Identify factors that modify the rate of chemical reactions
  • Explain rate constant and rate laws
  • Examine the effect of temperature on the rate of chemical reactions
  • Understand how activation energy and catalysts work
  • Define reaction mechanism and the rate determining step
  • Explain neutralization and acid-base reactions
  • Understand equilibrium, LeChatelier's principle, and the equilibrium constant

If at any time you have a question regarding any of these topics, be sure to send it to our instructors for clarification. Once you complete a lesson, you can take the lesson quiz to test your understanding of the material and identify areas of weakness. The quiz provides quick links back to the corresponding part of the lesson in case you get any questions wrong.

12 Lessons in Chapter 8: NES General Science: Chemical Reactions
Test your knowledge with a 30-question chapter practice test
What Is a Chemical Reaction? - Definition & Effects

1. What Is a Chemical Reaction? - Definition & Effects

A chemical reaction occurs as substances experience molecular alterations, resulting in different products. Learn the distinction between chemical reactions and physical changes, and study examples of the properties that change through various chemical reactions.

Endothermic and Exothermic Reactions

2. Endothermic and Exothermic Reactions

In endothermic reactions, the system gains heat as the surroundings cool down, and in exothermic reactions, the system loses heat as the surroundings heat up. Explore the differences between these reactions and learn about chemical reactions and enthalpy.

Neutralization and Acid-Base Reactions

3. Neutralization and Acid-Base Reactions

Ions and molecules may experience neutralization and acid-base reactions. Learn about these processes and the Bronsted-Lowry definition of conjugate acid and conjugate base, and explore the definitions of amphoteric and neutral as they pertain to pH.

Rate of a Chemical Reaction: Modifying Factors

4. Rate of a Chemical Reaction: Modifying Factors

Reaction rate is defined as the change in concentration of reactants or products in a chemical reaction over a specific period of time. Learn about reaction rate, chemical reactions, and the factors that affect the rate of chemical reactions (temperature, concentration, surface area, & catalysts).

Rate Constant and Rate Laws

5. Rate Constant and Rate Laws

Rate law is defined as the relationship between the rate of reaction and the concentration of the reactants. Learn about rate law, rate constant, and how to use rate law equations to determine reaction order for one or two reactants.

Rate of a Chemical Reaction: Effect of Temperature

6. Rate of a Chemical Reaction: Effect of Temperature

The rate of a chemical reaction is affected by temperature. Explore this process, learn about the Arrhenius equation, review the exponential factor, and define frequency factor.

Activation Energy and Catalysts

7. Activation Energy and Catalysts

Activation energy refers to the minimal quantity of energy required for compounds to experience a chemical reaction. Learn about activation energy and how chemical reactions occur, understand activated complex and transition state, and explore the role of catalysts in the body.

Reaction Mechanisms and The Rate Determining Step

8. Reaction Mechanisms and The Rate Determining Step

A reaction mechanism refers to the steps that occur in a chemical reaction. Learn about reaction mechanisms, including intermediates, and understand the role of the rate-determining step, a step that is slower than the other steps and controls the reaction rate.

Equilibrium: Chemical and Dynamic

9. Equilibrium: Chemical and Dynamic

Chemical equilibrium occurs when the rate of a forward chemical reaction is equal to the rate of reverse reaction while the concentrations of products and reactants remain unchanged. Learn about equilibrium constant, dynamic state, chemical equilibrium, and how chemists use equilibrium constant equations.

LeChatelier's Principle: Disruption and Re-Establishment of Equilibrium

10. LeChatelier's Principle: Disruption and Re-Establishment of Equilibrium

Le Chatelier's Principle refers to the process of disruption and the re-establishment of equilibrium. Learn about this principle, and understand how changes in concentration, temperature, and pressure affect equilibrium.

Equilibrium Constant (K) and Reaction Quotient (Q)

11. Equilibrium Constant (K) and Reaction Quotient (Q)

The equilibrium constant, K, is a number that expresses the ratio of products and reactants in a reaction once it reaches chemical equilibrium. Explore the state of equilibrium and the significance of chemical equilibrium and the reaction quotient (Q).

Common Chemical Reactions and Energy Change

12. Common Chemical Reactions and Energy Change

The five common types of chemical reactions are combination, decomposition, single-replacement, double-replacement, and combustion. Explore these different reactions, how to predict reactions, and learn how energy changes.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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