This lab has been taken from Addison Wesley Chemistry Laboratory Manual and
modified by Jagdeep Bhandal
Differentiating four general types of Chemical Reactions
Lab # 2
Background
Chemical reaction are concerned with breaking of old bonds and making of
new ones. Chemical reactions need energy for the reaction to take place. The
energy supplied can be in the form of heat, light or mechanical shaking so that
the reactants come in contact with each other. The atoms taking part in
chemical reaction can rearrange in several ways to create new products. From
the product of the reaction, the type of reaction that has taken place can be
known.
Different reaction types that will be considered in this lab are:
Combination reactions
Decomposition reactions
Single-replacement reactions,
Double replacement reactions
Objectives
To observe and classify chemical reactions of different reaction types. And then
write balanced equations for each reaction.
Equipment Required:
For Student Experiment
Safety Goggles
2 small test tubes
2 medium test tubes
1 test-tube rack
1 gas burner
1 ring stand
1 utility clamp
1 dropper pipette
1 crucible tongs
Materials
For Student Experiment
Iron fillings, Fe
This lab has been taken from Addison Wesley Chemistry Laboratory Manual and
modified by Jagdeep Bhandal
0.1 M copper(II) sulphate, CuSO4
0.1 M lead(II) nitrate, Pb(NO3)2
0.1 M potassium iodide, KI
3% hydrogen peroxide, H2O2
Wood splints
matches
Safety Requirements
All safety procedures form California Laboratory safety handbook should be
followed. All experiments should be done under the supervision of the
Chemistry teacher. Always wear safety goggles when working in the lab. Lead
and copper compounds are toxic. Use as little of these compounds as practical.
Procedure
As you perform the experiment, record your observations in table below.
1. Iron metal and copper(II) sulfate solution: Half-fill a small test tube with
copper(II) sulfate solution. Add about 2 g of iron fillings to the solution.
After 5 minutes record your observations.
2. Lead(II) nitrate and potassium iodide solutions- Put 2mL of lead(II)
nitrate solution in to a small test tube. Add 5-10 drops of potassium
iodide solution. Record your observations.
3. Action of heat on hydrogen peroxide- Add 2mL of the 3% hydgrogen
peroxide solution to a medium-sized test tube. Clamp the test tube to a
ring stand. Caution- Make sure the mouth of the tube is pointed away
from you and from everyone else. Very Gently heat the solution. Identify
any gas that forms by using crucible tongs to insert a glowing wood
splint into the mouth of the test tube. Record your observations.
This lab has been taken from Addison Wesley Chemistry Laboratory Manual and
modified by Jagdeep Bhandal
Observations:
Reaction
Observations
Reaction Type
Fe and CuSO4
Pb(NO3)2 and KI
H2O2 and Heat
Data Analysis
1. Classify each of the observed reactions as one of the five reaction types Combination reactions, Decomposition reactions, Single-replacement
reactions, Double replacement reactions.
2. Write an equation for each reaction observed. Indicate the state (s, l, g, aq)
for each reactant and product, then balance each equation.
Conclusions
Describe in your own words the five types of chemical reactions listed in the
Background section. Explain how you will distinguish each of these types of
reactions.