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Ch 7: NES General Science: The Mole Concept

About This Chapter

As you prepare for the NES General Science exam, you can use this chapter to study for questions related to the concept of a mole and how it is used to assess the quantity of atoms in a sample.

NES General Science: The Mole Concept - Chapter Summary

This chapter is a review of the mole and how it is used to calculate the number of atoms in a sample, the volume of a sample and the mass of a sample. In these videos, our expert instructors discuss topics you may find on the National Evaluation Series (NES) General Science related to:

  • Using Avogadro's number and counting atoms
  • Understanding chemical reactions and balancing chemical equations
  • Explaining chemical reactions and how to balance chemical equations
  • Examining mole-to-mole ratios
  • Using stoichiometry calculations for relative quantities of gas and mass-to-mass calculations

These lesson videos are mobile-device friendly, so you have a versatile way of studying mole concepts. In addition to watching the videos, you can read over the lesson transcripts, which identify key vocabulary in bold print. After completing these lessons, test your understanding of the material presented by taking the lesson quizzes.

5 Lessons in Chapter 7: NES General Science: The Mole Concept
Test your knowledge with a 30-question chapter practice test
Avogadro's Number: Using the Mole to Count Atoms

1. Avogadro's Number: Using the Mole to Count Atoms

Atoms are microscopic and challenging to count as a result. Learn about the importance of understanding the mole, which is simply a large number or quantity of something, also known as Avogadro's number, and how it helps scientists count large numbers of atoms.

Chemical Reactions and Balancing Chemical Equations

2. Chemical Reactions and Balancing Chemical Equations

The conservation of matter law enables scientists to balance a chemical equation. Explore the steps in balancing chemical equations, review chemical reactions, and use balanced chemical equations to show that matter is conserved.

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

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

In a chemical reaction, a mole ratio refers to a conversion factor that shows the ratio between mole amounts of any two compounds or substances involved in the reaction. Learn about mole-to-mole ratios, explore their role in the calculations of a chemical equation, and discover what this has to do with stoichiometry.

Stoichiometry: Calculating Relative Quantities in a Gas or Solution

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

Stoichiometry is the study of relative quantities in substances that undergo physical or chemical changes. Learn about stoichiometry of gases, molar volume, solutions, and how to use the four-step process to calculate relative quantities in a gas or solution.

Mass-to-Mass Stoichiometric Calculations

5. Mass-to-Mass Stoichiometric Calculations

Moles and mass are commonly used to express the amount of substances in stoichiometric calculations. Learn how to use equations and ratios to calculate moles to mass, moles to moles, mass to moles, or mass to mass in stoichiometric calculations.

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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