Ch 7: 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 7: 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

Sometimes, molecules look different on the outside, but only their physical appearance has changed. Other times, through chemical reactions, molecules change both inside and out, meaning both their physical and chemical properties have changed.

Endothermic and Exothermic Reactions

2. Endothermic and Exothermic Reactions

Explore a chemical reaction at the molecular level. Learn about exothermic and endothermic reactions, what they look like and what happens when they occur. Understand enthalpy and how you can use it to predict whether a reaction will be exothermic or endothermic.

Neutralization and Acid-Base Reactions

3. Neutralization and Acid-Base Reactions

From this lesson, you will understand the neutralization process between acids and bases. Learn how a hydroxide ion from a base reacts with a hydronium ion from an acid to neutralize each other and form water. Discover what conjugate acids and bases are and what the definition of amphoteric is.

Rate of a Chemical Reaction: Modifying Factors

4. 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.

Rate Constant and Rate Laws

5. 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.

Rate of a Chemical Reaction: Effect of Temperature

6. 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.

Activation Energy and Catalysts

7. 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.

Reaction Mechanisms and The Rate Determining Step

8. 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.

Equilibrium: Chemical and Dynamic

9. Equilibrium: Chemical and Dynamic

Learn the definition of chemical equilibrium and how it is dynamic. Discover what the equilibrium constant is and how it shows whether the reaction favors the reactants or products. Learn how chemists designate equilibrium in an equation and how they show the difference in reaction rate.

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

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

Learn how Le Chatelier's Principle describes the disruption and re-establishment of equilibrium. Learn to explain the factors that disrupt equilibrium, such as concentration, temperature, and pressure. Learn how each of these factors affects a system in equilibrium.

Equilibrium Constant (K) and Reaction Quotient (Q)

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

In this lesson, we will first define and explain the notion of a chemical equilibrium. Then, you'll learn about the equilibrium constant and reaction quotient. Finally, we'll round off the lesson with a couple of examples to solidify what you've learned!

Common Chemical Reactions and Energy Change

12. 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.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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