Grade 11 Chemistry
Physical and Chemical Change Lab
Purpose: To locate lab equipment, use Bunsen burners, describe chemicals, and to observe and
identify physical vs. chemical change.
Materials: List all materials used, separated into each part (A – F) on an attached piece of paper.
Use the general rule: If you touched it, write it down. ie, Make the list as you do the lab.
To help to visualize a more complicated setup, draw a labeled diagram whenever
appropriate. If labels are on the diagram, they do not need to be listed. Spelling counts!
Safety: Hydrochloric acid is corrosive. If spilled on clothes or skin, wash with water.
Iodine crystals stain skin and clothing. Iodine vapour is harmful – avoid breathing.
NOTE: Warm glass is very fragile. Don’t put cold water on it – it will shatter!
The orange gas observed in Part C is toxic. Use the fumehood!
Method: For all the parts below, use the observation table to:
(i) describe the physical properties of the starting materials
(ii) make brief observations during the chemical or physical change
(iii) decide if you have witnessed a chemical (C) or a physical (P) change
A) Place ONE crystal of iodine in a dry 150 mL beaker. Describe the iodine.
Place a watch glass filled with cold water over the beaker. Set up a ring stand with an iron ring and a
wire gauze. Steady the beaker with a second iron ring (see diagram on the board).
Set up a Bunsen burner with a gentle flame, and position the apparatus to heat the iodine crystal until it
disappears. Make observations.
Allow the glassware to cool without removing the watch glass, and then examine the glassware and
make observations.
B) Put one scoopula tip of copper (II) sulfate in a medium test tube and attach a test tube holder to the
test tube. Describe the copper (II) sulfate.
Use the test tube holder to shake the contents of the test tube over a hot Bunsen burner flame, until no
further change is observed. If the contents get “stuck”, gently tap the Bunsen burner to dislodge. Make
observations.
Deposit the contents of the test tube into a dry 50 mL beaker, and cool completely.
Put some tap water into a 100 mL beaker, and then add five drops of water to the solid using a dropper.
Make observations.
C) Place three or four crystals of copper (II) nitrate in one of the dirty test tubes from the front of the
room. Describe the copper (II) nitrate. Attach a test tube clamp to the test tube.
Use the Bunsen burner set up in the fume hood to heat the solid using a hot flame (point the test tube
away from you!) until the crystals begin to glow. Make observations.
D) Place one scoopula tip of zinc oxide in a medium test tube. Describe the zinc oxide.
Use a test tube holder and the Bunsen burner to heat the solid using a hot flame until you observe a
change. Make observations.
Allow the solid to cool for one minute and then observe again.
E) Put one dropper-full of hydrochloric acid in a medium test tube. Put one dropper-full of sodium
thiosulfate solution in a second medium test tube. Describe both solutions.
Mix the two solutions by pouring one into the other and make observations.
F) Put a scoopula tip of potassium chloride in a 150 mL beaker and describe the solid. Add about 5 mL
(no more!) of water directly into the beaker. Swirl the beaker until all of the potassium chloride has
disappeared. Make observations.
Set up a ring stand with an iron ring and a wire gauze. Steady the beaker with a second iron ring
(similar to Part A).
Set up a Bunsen burner with a gentle flame, and position the apparatus to heat the solution, using a
watch glass to prevent spattering when necessary, until all the water has disappeared. Make
observations.
Observations:
Part
Physical Properties of
Starting Materials
iodine is:
Conclusions:
Observations during Physical or
Chemical Change
while heating:
after cooling:
A
copper (II) sulfate is:
while heating:
after adding water:
B
copper (II) nitrate is:
while heating:
zinc oxide is:
while heating:
C
after cooling:
D
hydrochloric acid is:
E
sodium thiosulfate is:
potassium chloride is:
F
after mixing:
after mixing with H2O:
after heating:
Physical (P) or
Chemical (C)
Change?
Questions:
Answer the following questions using full sentences.
1) What happened to the iodine in part A when it was heated (use proper scientific terminology here)?
Is this a common occurrence? What is another example of this phenomenum?
2) Is the dissolving of sugar in water an example of a chemical or a physical change? What experiment
could you do to support your answer?
3) Tungsten wire is the metal that is used in light bulbs. If you turn on a light bulb, the wire will glow
red. Is this an example of a chemical or a physical change? How do you know this?
4) Does a dramatic change in colour always indicate that a chemical change is being observed?
Support your answer by referring to parts of this experiment.
5) Describe one chemical change and one physical change that you might observe in your everyday
life.
Grade 11 Chemistry
Name: ______________________________
Physical and Chemical Change Lab – Marking Key
Quiz
0
1
2
3
Materials
accurate for each part
include labelled diagrams
0
0
Observations
Part A
Part B
Part C
Part D
Part E
Part F
0
0
0
0
0
0
1
1
1
1
1
1
2
2
2
2
2
2
3
3
Questions
#1
#2
#3
#4
#5
0
0
0
0
0
1
1
1
1
1
2
2
2
2
2
3
Totals: Thinking/Inquiry
Communication
1
1
2
2
3
3
3
3
3
/ 41
/ 10
4
4
5
6