Ch 25: TASC Science: Chemical Reactions

About This Chapter

Review the basics of chemical reactions in preparation for the TASC Science exam. The videos cover topics in balancing and calculating different types of chemical reactions and processes.

TASC Science: Chemical Reactions - Chapter Summary

Study with us to refresh your knowledge of working with chemical equations. Our video lessons and quizzes cover the essential principles for solving word and formula equations to help you prepare for the TASC Science exam. Specific topics include:

  • Factors that impact the rate of a chemical reaction
  • The effect of temperature on a chemical reaction
  • Catalysts
  • Energy transfer
  • Chemical and dynamic equilibriums
  • LeChatelier's Principle
  • Balancing chemical equations
  • Stoichiometry
  • Excess reactants
  • Calculating yields and composition
  • Empirical formulas

The videos in this chapter include fun graphics and real-life examples to present key concepts in working with chemical reactions. The transcripts highlight important formulas, and you can test your understanding of the lesson topics through the multiple-choice quizzes found at the end of each chapter.

TASC Science: Chemical Reactions - Chapter Objectives

The TASC Science exam is made up of 58 questions that test your knowledge of the Earth and space, physical and life sciences. The questions may include tables, graphs, text passages or figures, and they generally ask you to evaluate the accuracy of scientific methods and apply those methods to a scientific situation. Chemistry-related questions, including those on chemical reactions, can be found within the physical science content questions. This content area makes up 36% of the test questions. You can use this chapter to prepare for questions that relate to calculating or balancing chemical reactions. You'll have 85-90 minutes to complete this test.

11 Lessons in Chapter 25: TASC Science: Chemical Reactions
Test your knowledge with a 30-question chapter practice test
Rate of a Chemical Reaction: Modifying Factors

1. 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 of a Chemical Reaction: Effect of Temperature

2. 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

3. 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.

Enthalpy: Energy Transfer in Physical and Chemical Processes

4. Enthalpy: Energy Transfer in Physical and Chemical Processes

This video explores the relationship between chemistry and energy. We learn the general properties of energy and the concepts of temperature and heat. We will learn about energy flow and consider the enthalpy change during chemical reactions.

Equilibrium: Chemical and Dynamic

5. 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

6. 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.

Chemical Reactions and Balancing Chemical Equations

7. 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.

Stoichiometry: Calculating Relative Quantities in a Gas or Solution

8. Stoichiometry: Calculating Relative Quantities in a Gas or Solution

In this lesson, learn about molar volume and how to set up and make stoichiometric calculations with gases. Then learn about solution stoichiometry and how to make stoichiometric calculations with solutions.

Limiting Reactants & Calculating Excess Reactants

9. Limiting Reactants & Calculating Excess Reactants

In this lesson, you'll learn what limiting reactant and excess reactant mean and how to determine which reactant is limiting in a chemical reaction when given the amount of each reactant. You'll also discover how to calculate the amount of product produced.

Calculating Reaction Yield and Percentage Yield from a Limiting Reactant

10. Calculating Reaction Yield and Percentage Yield from a Limiting Reactant

Learn what the theoretical yield, actual yield and percent yield are. Given the limiting reactant, learn how to calculate the theoretical reaction yield, which is also known as the ideal reaction yield and percentage yield.

Calculating Percent Composition and Determining Empirical Formulas

11. Calculating Percent Composition and Determining Empirical Formulas

Learn the difference between the empirical formula and chemical formula. Learn how to calculate the percent composition of an element in a compound. Learn how, if given a percent composition, to determine the empirical formula for a compound.

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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