Summary CHM 1025.Exam 2 study guide

Chemistry Exam 2 Study Guide (Chapters 5-7)

Chapter 5: Chemical Reactions and Equations

5.1 What is a Chemical Reaction:
 Reactant- a substance converted into another substance during a chemical reaction.
 Product- a substance formed from another substance or substances during a chemical
reaction.
o Products are different from reactants in the arrangement of their
component atoms.

5.2 How Do We Know a Chemical Reaction Occurs:
 The clues most often used by chemists are the following:
o Change in color
o Production of light
o Formation of a solid (such as a precipitate in solution, smoke in air,
or a metal coating)
o Formation of a gas (bubbles in solution or fumes in the gaseous state)
o Absorption or release of heat (sometimes appearing as a flame)

5.3 Writing Chemical Equations:
 Chemical Equation- an abbreviated representation of a chemical reaction consisting of
chemical symbols and formulas.
 Balanced Equation- a chemical equation that uses coefficients in front of each formula to
make the number of atoms of each element the same on both sides of the equation.

, 5.4 Predicting Chemical Reactions:

Classes of Chemical Reactions




 Decomposition Reaction- a chemical reaction in which a substance breaks down into
simpler compounds or elements.