Group Members:
Chemical and Physical Change
Qualitative Test for Gases
Apparatus and Materials:
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3% hydrogen peroxide
manganese (IV) oxide powder
calcium
magnesium ribbon
copper sulfate (bluestone)
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goggles at all times
stirring rod
scoopula
straw
test tube rack
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lighter
rubber stopper
wooden splints
test tubes
Procedure:
Lab Station 4
Demo by teacher:
(A) 2-3 mL of sodium chloride solution are
added to 2-3mL of silver nitrate solution.
(B) A piece of copper wire is place in silver
nitrate solution
Lab Station 1
1. Fill one test tube about one-third full with water
2. Place a piece of calcium metal into a test tube
and immediately cover it with a rubber stopper.
Collect the gas produced.
3. When the reaction is over, remove the stopper and
immediately insert a burning splint into the test tube.
4. Record observations in chart
5. Dispose the contents down the sink.
Lab Station 2
1. Place 5 mL of limewater into a clean test tube.
2. Insert a straw into the limewater then exhale
through the straw (Do NOT inhale!)
3. Record observations in chart
4. Dispose the contents down the sink.
Lab Station 3
1. Fill a clean and dry test tube with about 5 mL
(one thumb width) of hydrogen peroxide.
2. Add to the peroxide a tip of a scoopula of
manganese dioxide and lightly place a rubber
stopper in the mouth of the test tube.
3. Record observations in chart
4. When the reaction is over, insert a glowing
splint into the test tube.
5. Record observations in chart.
6. Dispose of all liquids in the proper waste
container!
1. Place about 5 mL of dilute hydrochloric acid in
a clean test tube.
2. Add one small piece of magnesium ribbon to
the acid and place a rubber stopper in the mouth
of the test tube.
3. Record observations in chart
4. When the reaction is over, remove the stopper and
immediately insert a burning splint into the test
tube.
5. Record observations in chart
6. Dispose of all liquids in the proper waste
container!
Lab Station 5
1. Add to a clean and dry test tube a tip of a
scoopula of copper (II) sulfate
2. Add 5 mL of water to the copper (II) sulfate and
gently shake.
3. Record observations in chart
4. When done, dispose of solution in the proper
waste container!
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Discussion Questions
1. Manganese (IV) oxide acted a s a catalyst in
Lab 1. What is a catalyst? What role does it
play in a chemical reaction?
2. In Lab 2 an aqueous solution was formed.
What is an aqueous solution (aq)?
3. What is a precipitate and how is it formed?
Lab Report Due:
Group Members:
Lab #
Starting Substances
Physical Properties
of starting substances
Changes Observed After Mixing
(e.g., state, colour change, gas formation etc.)
Physical or
Chemical Change?
Description of results from
Gas Test
Demo
(A)
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sodium chloride
silver nitrate
NA
Demo
(B)
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copper
silver nitrate
NA
1
2
3
4
5
NA
Group Members:
Lab #
Demo
(A)
Starting Substances
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Demo
(B)
Physical Properties
of starting substances
Changes Observed After Mixing
(e.g., state, colour change, gas formation etc.)
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1
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-
2
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3
4
5
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Physical or
Chemical Change?
Results of Gas Test
or NA (not applicable)
Group Members: