11.2. Types of Chemical Reactions http://www.ck12.org
11.2 Types of Chemical Reactions
Lesson Objectives
- Be able to classify a chemical reaction as a combination, decomposition, single replacement, double replace-
ment, or combustion reaction. - Be able to predict the products when given a set of reactants for a given chemical process.
- Explain the concept of solubility and the process of precipitation.
- Use solubility information to predict whether or not a given substance is soluble in water.
- Use the general solubility rules to predict chemical behavior.
- Be able to write molecular, ionic, and net ionic equations for a given chemical process.
Lesson Vocabulary
- combination reaction: A reaction where two or more chemical species combine to produce a single new
compound. - decomposition reaction: A reaction where a single chemical species breaks down to produce two or more
new chemical species. - single replacement reaction: Occurs when one chemical species (often a single element) replaces a portion
of another compound to produce two new products. - double replacement reaction: Occurs when the cations from the original two ionic compounds trade anions
to make two new ionic compounds. - molecular equation: An equation that shows all ionic components as neutral compounds, but the ones that
are dissolved in water are denoted with "(aq)." - ionic equation: A chemical equation in which the various reaction components are represented as they
actually exist in the reaction, for example, as individual ions. - spectator ion: Ions that are present in solution but do not participate in the overall reaction.
- net ionic equation: The simplified ionic equation in which all of the spectator ions are cancelled out.
- combustion: Occurs when a hydrocarbon reacts in the presence of oxygen to produce water and carbon
dioxide.
Check Your Understanding
Study theFigure11.6, which depicts the mass change that occurs when steel wool burns in air.
- What happens to the mass of the steel wool as the reaction proceeds?
- Given that mass must be conserved in chemical reactions (it cannot come from nowhere), what might be your
explanation for the change in the mass of the steel wool? - How might mass changes such as this help us identify and categorize a given chemical process?