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Ch 7: Praxis General Science: Chemical Reactions

About This Chapter

Review the material in these lesson videos to prepare for questions on the Praxis General Science exam regarding chemical equations, the mole concept, stoichiometric calculations, and yields.

Praxis General Science: Chemical Reactions - Chapter Summary

The lessons of this chapter have been put together to help you prepare for questions on the Praxis General Science exam regarding chemical reactions, the chemical equations used to represent them, and the calculations used to determine the quantity of reactants and products of a chemical reaction. Through these lessons, you will be able to improve your understanding of:

  • Defining and balancing chemical equations
  • Explaining mole-to-mole ratios and calculations of chemical equations
  • Making mass-to-mass stoichiometric chemical calculations
  • Detailing modifying factors, including the effect of temperature, on chemical reactions
  • Examining activation energy
  • Explaining LaChatelier's principal of disruption and re-establishment of equilibrium
  • Defining oxidation-reduction reactions
  • Writing and balancing combustion reactions

This information is presented through short video lessons that can be viewed conveniently on your mobile device. To improve your retention of the material presented, you can also read the transcripts. If you have any questions regarding the topics in this chapter, feel free to send them to our instructors.

9 Lessons in Chapter 7: Praxis General Science: Chemical Reactions
Test your knowledge with a 30-question chapter practice test
Chemical Reactions and Balancing Chemical Equations

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.

Mole-to-Mole Ratios and Calculations of a Chemical Equation

2. Mole-to-Mole Ratios and Calculations of a Chemical Equation

Learn what a mole ratio is and how to determine and write the mole ratio relating two substances in a chemical equation in this video lesson. Also, learn to make mole-to-mole calculations and solve problems involving moles of substances.

Mass-to-Mass Stoichiometric Calculations

3. Mass-to-Mass Stoichiometric Calculations

Learn how to set up and make mole to mass, mass to mole and mass to mass stoichiometric calculations. Learn how the ratios of moles helps you compare and make calculations. Learn how to relate mole ratios to molar mass.

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 of a Chemical Reaction: Effect of Temperature

5. 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

6. 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.

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

7. 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.

Redox (Oxidation-Reduction) Reactions: Definitions and Examples

8. Redox (Oxidation-Reduction) Reactions: Definitions and Examples

This short video will explain oxidation-reduction reactions, or redox reactions for short. The focus is on how electrons are transferred during redox reactions. Learn some neat mnemonic devices to help you remember when an atom is oxidizing or reducing.

Writing and Balancing Combustion Reactions

9. 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.

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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