A Study of the Types of Reactions
There are four types of chemical reactions: synthesis, decomposition, single replacement, and double replacement. These reactions can be observed by noting a physical change in the nature of the reactants.
Changes in physical characteristics which give a hint to the chemical changes occurring in a reaction include the formation of a precipitate, the generation of a gas, a change in the color of the solution or the generation or absorption of heat. Not all chemicals react with one another, but when a reaction does occur, some change in characteristics will be noted.
The following lab explores the reaction of ions in solution. Careful observations should be made in order to separate the reactive pairs from the non-reactive ones.
Group A – 0.1 M solutions Test Tubes
Copper (II) nitrate
Nickel (II) nitrate
Lead (II) nitrate
Cobalt (II) nitrate
Iron (III) nitrate
· The object of this experiment is to mix each of the reagents in Group A with each of the reagents in Group B.
1. Which combinations resulted in a reaction? Be specific using names or formulas of combinations.
2. Which reactions resulted in a precipitate?
3. Which resulted in the generation of a gas?
4. What do the compounds in Group A of this laboratory investigation have in common? Why is this commonality important in the study of reactions?
5. What substitutions could be made in Group B and still maintain the same “types” of reactions?