Full Lesson

Equations with One Variable

This lesson introduces how to solve linear equations and linear inequalities. One-Step Linear Equations A linear equation is an equation where two expressions are set equal to each other. The equation is in the form ax + b + c = 0, where a is a non-zero constant and b and c are constants. The exponent on a linear equation is always 1, …

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Ratios, Proportions, and Percentages

This lesson reviews percentages and ratios and their application to real-world problems. It also examines proportions and rates of change. Percentages A percent or percentage represents a fraction of some quantity. It is an integer or decimal number followed by the symbol %. The word percent means “per hundred.” For example, 50% means 50 per 100. This is equivalent to half, …

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Acids and Bases

Let’s Review Acids and bases exhibit unique properties when dissolved in water. Acids donate protons (in the form of hydrogen ions) and bases accept protons (or hydrogen ions) in solution. Acids generally taste sour, turn litmus paper red, and act corrosive. Bases generally taste bitter, turn litmus paper blue, are very corrosive, and will be …

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Chemical Solutions

This lesson discusses the properties of different types of mixtures, focusing on solutions. Then, it examines aspects of chemical reactions, including the components of the reactions and the types of changes that occur. Solutions When elements and compounds are physically (not chemically) combined, they form a mixture. When the substances mix evenly and it is …

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Decimals and Fractions

This lesson introduces the basics of decimals and fractions. It also demonstrates changing decimals to fractions, changing fractions to decimals, and converting between fractions, decimals, and percentages. Introduction to Fractions A fraction represents part of a whole number. The top number of a fraction is the numerator, and the bottom number of a fraction is the denominator. The numerator …

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Basic Multiplication and Division

This lesson describes the process of multiplying and dividing numbers and introduces the order of operations, which governs how to evaluate expressions containing multiple arithmetic operations. Multiplication Addition can be tedious if it involves multiple instances of the same numbers. For example, evaluating 29 + 29 is easy, but evaluating 29 + 29 + 29 …

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Basic Addition and Subtraction

This lesson introduces the concept of numbers and their symbolic and graphical representations. It also describes how to add and subtract whole numbers. Numbers A number is a way to quantify a set of entities that share some characteristic. For example, a fruit basket might contain nine pieces of fruit. More specifically, it might contain three apples, …

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Chemical Bonds

This lesson introduces bonding and explains the three ways in which atoms can become stable. The rest of the lesson examines different types of bonds in more detail. Introduction to Bonding Chemical elements found in the periodic table have different levels of reactivity. The number of valence electrons in an atom is the most important …

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Properties of Matter

This lesson introduces the properties of matter, which are fundamental to the understanding of chemistry. Matter and Its Properties Aluminum, clothing, water, air, and glass are all different kinds of matter. Matter is anything that takes up space and has mass. A golf ball contains more matter than a table-tennis ball. The golf ball has …

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