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Chemistry LibreTexts

5: Introduction to Chemical Reactions

  • Page ID
    218317
    • 5.1: Changes in Matter - Physical and Chemical Changes
      Change is happening all around us all of the time. Just as chemists have classified elements and compounds, they have also classified types of changes. Changes are either classified as physical or chemical changes. Chemists learn a lot about the nature of matter by studying the changes that matter can undergo. Chemists make a distinction between two different types of changes that they study - physical changes and chemical changes.
    • 5.2: Differences in Matter- Physical and Chemical Properties
      A physical property is a characteristic of a substance that can be observed or measured without changing the identity of the substance. Physical properties include color, density, hardness, and melting and boiling points. A chemical property describes the ability of a substance to undergo a specific chemical change.
    • 5.3: Conservation of Mass - There is No New Matter
      The law of conservation of mass states that matter can not be created or destroyed in a chemical reaction. So the mass of the product equals the mass of the reactant. A reactant is when two or more elements chemically interact to make a new substance and a product is the substance that is formed as the result of a chemical reaction. Mass and matter may not be able to be created or destroyed, but it can change forms to other substances like liquids, gasses, solids, etc.
    • 5.4: Chemical Equations
      A chemical reaction is the process in which one or more substances are changed into one or more new substances. Chemical reactions are represented by chemical equations. Chemical equations have reactants on the left, an arrow that is read as "yields", and the products on the right.
    • 5.5: How to Write Balanced Chemical Equations
      In chemical reactions, atoms are never created or destroyed. The same atoms that were present in the reactants are present in the products - they are merely reorganized into different arrangements. In a complete chemical equation, the two sides of the equation must be present on the reactant and the product sides of the equation.
    • 5.6: Mole-Mole Relationships in Chemical Reactions
      The balanced chemical reaction can be used to determine molar relationships between substances.
    • 5.7: Mole-Mass and Mass-Mass Problems
      A balanced chemical equation can be used to relate masses or moles of different substances in a reaction.
    • 5.E: Introduction to Chemical Reactions (Exercises)
    • 5.S: Introduction to Chemical Reactions (Summary)
      To ensure that you understand the material in this chapter, you should review the meanings of the following bold terms in the following summary and ask yourself how they relate to the topics in the chapter.

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