Directions:
Read the lab description and directions on the following pages.
We performed these chemical reactions and each one produced a gas. We used the
splint test to identify the gasses (see “Reaction Notes” or your electrolysis lab notes for
an explanation of the splint test.).
Below you will find the results of the splint test filled in. Your main job is for each of the
reactions determine the gas product (H2, O2 or CO2). Then balance the equation and
draw the balanced reaction. (By drawing I mean show the atoms and molecules on
each side of the balanced equation.)
Complete this work on your own paper. The notes in red on the following pages help
you with what you need to write to get credit.
Be sure to start out by writing the lab title and purpose.
Three Gasses (+1) Lab
Purpose: To perform five chemical reactions, determine the gasses
produced, and balance an equation for each reaction.
For Each Reaction
1) Write the reaction number / title.
2) Record observations: what the reaction looked like (evidence
of a reaction)
3) Record the result of the splint test. Determine what gas was
produced (carbon dioxide, oxygen or hydrogen).
4) Copy the equation.
5) Fill in the blank in the equation with the formula for the gas
produced:
Carbon Dioxide ... CO2
O
C
Oxygen ............ O2
O
O
Hydrogen gas: .... H2
H H
6) Balance the equation.
7) E/C: Identify the reaction as a Synthesis, Decomposition,
Double Displacement, Single Displacement or Combustion
reaction. (Google)
-
Reaction #1: Vinegar & Baking Soda
H2CO3
H2O +
*Note: this is the second part of a two-part equation
Procedure:
● Measure 10 ml of vinegar (HCH3CO2) into the test tube.
● Add a small amount of baking soda (just fill the very tip of the scoopula).
● As the reaction is taking place, light a splint and put it into the top of the test tube above
the liquid.
What to write
1) Write the reaction number / title.
2) Record observations: what the reaction looked like (evidence
of a reaction)
3) Record the result of the splint test. Determine what gas was
produced (carbon dioxide, oxygen or hydrogen).
4) Copy the equation.
5) Fill in the blank in the equation with the formula for the gas
produced:
Carbon Dioxide ... CO2
O
C
Oxygen ............ O2
O
O
Hydrogen gas: .... H2
H H
6) Balance the equation.
O
Reaction #2: Hydrogen Peroxide & Yeast
H2O2
H2O +
*Note: yeast is a catalyst that makes this reaction faster.
Procedure:
● Measure 10 ml of hydrogen peroxide (H2O2) into the test tube.
● Add a small amount of yeast (just fill the very tip of the scoopula).
● As the reaction is taking place, light a splint and hold it inside the top of the test tube
above the liquid. Record the result.
● Rinse the test tube and stopper.
What to Write:
1) Write the reaction number / title.
2) Record observations: what the reaction looked like (evidence
of a reaction)
3) Record the result of the splint test. Determine what gas was
produced (carbon dioxide, oxygen or hydrogen).
4) Copy the equation.
5) Fill in the blank in the equation with the formula for the gas
produced:
Carbon Dioxide ... CO2
O
C
Oxygen ............ O2
O
O
Hydrogen gas: .... H2
H H
6) Balance the equation.
O
Reaction #3:
Magnesium and Hydrochloric Acid
HCl
+ Mg
MgCl2 +
Procedure:
● Measure 5 ml of Hydrochloric acid (HCl) into the test tube.
● Add a piece of magnesium (Mg).
● Rest the rubber stopper with a hole in it on the test tube. Do not push it on tight!
● As the reaction is taking place, light a match and hold it to the top of the test tube.
Remove the stopper and perform the flame test.
What to Write:
1) Write the reaction number / title.
2) Record observations: what the reaction looked like (evidence
of a reaction)
3) Record the result of the splint test. Determine what gas was
produced (carbon dioxide, oxygen or hydrogen).
4) Copy the equation.
5) Fill in the blank in the equation with the formula for the gas
produced:
Carbon Dioxide ... CO2
O
C
Oxygen ............ O2
O
O
Hydrogen gas: .... H2
H H
6) Balance the equation.
O
Reaction #4:
Calcium Carbonate and Hydrochloric Acid
HCl
+ CaCO3
CaCl2 +
H2O
+
Procedure:
● Measure 5 ml of hydrochloric acid (HCl) into the test tube.
● Add a small amount of Calcium carbonate (CaCO3) … just fill the very tip of the
scoopula.
● Rest the rubber stopper with a hole in it on the test tube. Do not push it on tight!
● As the reaction is taking place, light a match and hold it to the top of the test tube.
Remove the stopper and perform the flame test.
What to Write:
1) Write the reaction number / title.
2) Record observations: what the reaction looked like (evidence
of a reaction)
3) Record the result of the splint test. Determine what gas was
produced (carbon dioxide, oxygen or hydrogen).
4) Copy the equation.
5) Fill in the blank in the equation with the formula for the gas
produced:
Carbon Dioxide ...CO2
O
C
Oxygen ............O2
O
O
Hydrogen gas: ....H2
H H
6) Balance the equation.
O
Reaction #5:
Carbide and Water
The First Reaction you observed:
Ca C2 + H2O
Carbide
C2 H2 + Ca O
Wat er
Acet ylene
Calcium
Oxide
The Second reaction you observed:
C2H2 + O2
H2O
+
CO 2
Procedure:
● Place a small amount of calcium carbide (CaC2) into water
● As the reaction is taking place, light a match and hold it to the top of the beaker. You
will observe a second reaction.
What to Write: