Station 1
In a test tube mix
De-ionized Water (10 mL)
+
Copper (II) Sulfate (1.0 g)
1.
BEFORE they are mixed, record the physical properties of
deonized water and copper (II) sulfate.
2.
Measure 1.0 g of solid copper (II) sulfate and put into the
test tube using the scoopula.
3.
Measure 10 mL of water and pour into the test tube.
4.
Put a rubber stopper on the test tube.
5.
Shake gently to mix chemicals well until completely mixed.
6.
Observe what is happening when the substances are mixed.
Record your observations, inference and supporting
evidence.
7. DO NOT THROW OUT YOUR SOLUTION!
YOU WILL NEED it for Stations 2 and 3.
Station 2
In a new test tube mix
Copper (II) Sulphate Solution (5mL)
(from Station 1)
+
Sodium Carbonate Solution (5 drops)
1. BEFORE they are mixed, record the physical properties of
copper (II) sulfate and sodium carbonate solutions.
2. Measure 5 mL of copper (II) sulfate and pour into a new
test tube.
3. Add 5 drops of the sodium carbonate solution to the test
tube.
4. DO NOT SHAKE CHEMICALS.
5. Observe what is happening when the substances are
mixed. Record your observations, inference and
supporting evidence.
6. NOW YOU CAN MIX THE CHEMICALS.
7. Dispose of test tube contents as indicated. Wash your
test tube and stopper and return them to Station 1.
Station 3
In a small beaker (or plastic cup) mix
Ball of Steel Wool
+
Copper (II) Sulphate Solution (5 mL)
(from Station 1)
1. BEFORE they are mixed, record the physical properties of
copper (II) sulfate and the steel wool.
2. Measure 5 mL of copper (II) sulfate.
3. Please the steel wool in the beaker.
4. Pour the copper (II) sulfate solution onto the steel wool.
5. Observe what is happening when the substances are
mixed. Record your observations, inference and
supporting evidence.
6. Dispose of contents as indicated. Wash the beaker and
return them to Station 3.
Station 4
In a test tube mix
Hydrochloric Acid (5mL)
+
One piece of Magnesium
**********************************************************************
TEST for Hydrogen (H2) gas
1. BEFORE they are mixed, record the physical properties of
hydrochloric acid and magnesium.
2. Put magnesium into the test tube and pour 5 mL of
hydrochloric acid into the test tube.
3. IMMEDIATELY cover the mouth of the test tube with
your thumb to make sure no gas escapes.
4. Observe what is happening when the substances are mixed.
Record your observations, inferences and supporting
evidence.
5. Now perform the TEST for Hydrogen gas.
Station 4
TEST for Hydrogen (H2) gas
1. Cover test tube with your thumb to make sure no gas
escapes.
2. Wait until you feel a lot of pressure on your thumb.
3. Hold test tube at 45°
4. Remove your thumb and quickly place a FLAMING splint
at the mouth of the test tube.
5. Observe and record.
6. Dispose of contents as indicated. Wash the test tube and
return it to Station 4.
Station 5
In a test tube mix
Starch Solution (5 mL)
+
Iodine Solution (2 or 3 drops)
1. BEFORE they are mixed, record the physical properties of
the Starch and Iodine solutions.
2. Measure 5 mL of starch solution and pour into the test tube.
3. Add 2 or 3 drops of iodine solution into the test tube.
4. Observe what is happening when the substances are mixed.
Record your observations, inference and supporting
evidence.
5. Dispose of contents as indicated. Wash the test tube and
return it to Station 5.
Station 6
In a test tube mix
Small scoop of Baking Soda
+
Vinegar (10 mL)
******************************************************************
TEST for Carbon Dioxide (CO2) gas
1. BEFORE they are mixed, record the physical properties of
the Baking Soda and Vinegar.
2. Place 1 small scoop of baking soda in the test tube.
3. Add 10 mL of vinegar to the test tube.
4. Observe what is happening when the substances are mixed.
Record your observations, inferences and supporting
evidence.
5. NOW perform test for Carbon Dioxide gas.
Station 6
TEST for Carbon Dioxide (CO2) gas
1. Hold test tube at 45°.
2. Insert a FLAMING splint INSIDE the test tube.
3. Observe and record.
4. Dispose of chemicals in the sink at your station.
5. Wash the test tube and return to Station 6.
Station 7
In a test tube mix
Hydrogen Peroxide (5 mL)
+
Tiny amount of Manganese (IV) Oxide
**********************************************************************************
TEST for Oxygen (O2) gas
1. BEFORE they are mixed, record the physical properties of
hydrogen peroxide and manganese (IV) oxide.
2. Pour 5 mL of hydrogen peroxide into the test tube.
3. Place a very small amount of manganese (IV) oxide on the
scoopula. It should be smaller than a pea!
4. IMMEDIATELY cover the mouth of the test tube with
your thumb to make sure no gas escapes.
5. Observe what is happening when the substances are mixed.
Record your observations, inferences and supporting
evidence.
6. NOW perform test for Oxygen gas.
Station 7
TEST for Oxygen (O2) gas
1. Cover test tube with your thumb to make sure no gas
escapes.
2. Wait until you feel a lot of pressure on your thumb.
3. Hold test tube at 45°
4. Remove your thumb and quickly place a GLOWING splint
INSIDE the test tube. Repeat as often as a reaction
occurs.
5. Observe and record.
6. Wash the test tube and return to Station 7.
LAB QUESTIONS - Prepare answers to the following questions.
1.
What gas was produced when you mixed magnesium with hydrochloric acid? What is your
evidence?
2.
What gas was produced when you mixed baking soda with vinegar? What is your
evidence?
3.
Describe the test for oxygen. Explain the observation.
4.
Pick any three types of evidence of chemical changes that we listed in class. For each
type of evidence, state one example of a chemical change in the lab that would represent
this type of evidence.
a.
b.
c.
5.
Define the terms: Combustion and Corrosion.
a. What is a major similarity between these two types of reactions?
b. What is a major difference between these two types of reactions?
c. Give one ‘real-life’ example of these two types of reactions.
6.
Make note of any safety rules you had to follow, safety equipment, and substance you
used, and be prepared to explain the reasons why.
7.
Research a career (other than pyrotechnician, photographer, and scientist/science
teacher) where knowledge of chemical changes is important. How does a person in this
career use their knowledge of chemical changes in their job?
Equipment List – Chemical Changes Lab
Chemicals
Equipment
Copper (II) sulphate powder
2 beakers
stn 1
100 mL beakers (12)
2
stn 1, 4, 6, 7
4
stn 3
Sodium carbonate solution
2 dropper
stn 2
Scoopula (6)
2
stn 1, 6, 7
Steel Wool cut into small pieces
2 baskets
1 lg basket
stn 3
stn 8
Test tubes (24)
4
stn 1, 2, 4, 5, 6, 7
2 dropper bottles
stn 4
Test tube rack (12)
2
stn 1, 2, 4, 5, 6, 7
Hydrochloric acid 1M
Magnesium strips
2 containers stn 4
Baskets (4)
2
stn 3, 8
Starch Solution
2 flasks
stn 5
Electronic balance (2)
2
stn 1
stn 5
Graduated cylinders (10 mL) (12)
2
stn 1, 2, 4, 5, 6, 7
Iodine Solution
2 dropper bottles
Vinegar
2 beakers
stn 6
Erlenmeyer flasks (2)
2
stn 7
Baking soda
2 beakers
stn 6
Droppers (12)
2
stn 1, 2, 4, 5, 6, 7
Hydrogen Peroxide
2 flasks
stn 7
Bunsen burner and hose
1
stn 8
Manganese (IV) oxide
2 beakers
stn 7
Crucible tongs
1 stn 8
Candles
3
Waste disposal (3)
Retort stand, iron ring clamps, funnel, bottles, filters,
squirt bottles, paper towels
Splints
1 bunch
Washing Station
2 plastic tubs, 2 test tube brushes, soap
Matches
1 box
stn 4
stn 4, 6, 7
stn 8