1. Inquiry: How are physical changes and chemical changes different?
In this presentation you will:
explore the differences between physical and chemical changes
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2. Inquiry: How are physical changes and chemical
changes different?
Journal Entry:
a) What substances/chemicals did you begin with?
b) Place the effervescent pill into the cup of water. Observe and record your observations.
c) What did you observe being produced?

3. Inquiry: How are physical changes and chemical
changes different?
Deflating a Basketball
Physical Change: appearance changes (ex. Color, shape, size, weight) but no new chemical bonds are formed or broken.
VS.
A nail rusting
Chemical change: appearance changes because a chemical reaction occurred. (new bonds where formed or broken)
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4. Examples of Physical Changes
Cutting a piece of paper: The shape, size and weight has changed, but it is still paper. (No chemical bonds where formed or broken)
Molding Clay: Shape has changed but it is still clay. (No chemical bonds have been broken).
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5. Inquiry: How are physical changes and chemical changes different?
Metals are malleable (bendable).
What type of change is bending/forging metals?
a) Physical Change
Shape has changed but no
new molecules formed
b) Chemical Change
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6. Create the following table under your journal entry:
Round #
# of leggos (atoms
# of molecules 1 2 3

7. Inquiry: How are physical changes and chemical changes different?
Step # 1: Create the following data table under your journal.
Step # 2: On your table are a set of blocks.
Count and record how many leggo blocks (atoms)
your group has.
Step # 2: Your group has 20 seconds to create a
leggo house (molecule) or leggo houses.
Count and record how many houses (molecules) you
created and your total amount of blocks(atoms)
Step # 3: Repeat step # 2, however create new houses
(molecules)

8. Inquiry: How are physical changes and chemical changes different?
Task # 1:
Your group has cut out picture describing different types of changes.
Create 2 columns (one for physical changes and one for chemical changes)
As a group separate the pictures that are only physical changes from the pictures that are chemical changes by placing the picture in the appropriate column.
Record your answers on your guided notes in the section that says “Round 1”
Remember: Physical changes (NO NEW MOLECULES)
Chemical changes (NEW MOLECULES)
(3 mins)

9. Inquiry: How are physical changes and chemical changes different?
Task #2
You are about to watch a video from Brain Pop describing the differences between physical and chemical changes
Complete the vocabulary at the back of your guided notes while you view the video.
Think about some the differences between a physical change and a chemical change.
Can a chemical change also cause a change in physical properties?

10. Make corrections to way you separated the pictures.
Inquiry: How are physical changes and chemical changes different?
Task #3
Reexamine the way your group partitioned physical changes from chemical changes.
Make corrections to way you separated the pictures.
Record your answers in the front of your guided notes under “Round 2”.

11. Inquiry: How are physical changes and chemical changes different?
Task #4
Put everything away except for a pen and loose leaf paper.
Take a clean sheet of loose leaf paper and split it in half. (physical change)
Give one half to the person next to you and keep the other half for yourself.
Write your heading on your half of the paper.
Your will take a 10 question assessment on what you learned.
Number your paper from Read each question that is projected on the board. Write the letter of you answer.
(You may discuss answers with your table)

13. Inquiry: How are physical changes and chemical changes different?
Chemical Equations: explain what is happening during a chemical
change
Solid
Solid
Example:
2 Na (s) + Cl2 (g)  2 NaCl (s)
Gas +  Cl Cl Cl Cl Na Na Na Na  +
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14. Reading Chemical Equations:
Inquiry: How are physical changes and chemical
changes different?
Reading Chemical Equations:
2 Na plus Cl2 produces (yields) 2 NaCl
2 Na (s) + Cl2 (g)  2 NaCl (s)
Reactants (Re-act-ants):
The “stuff” (atoms and molecules)
you begin with.
Everything on the left of the arrow
Products:
The “stuff” (atoms and molecules)
you end up with.
Everything on the right of the arrow
2 Na + Cl2
2 NaCl
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15. +  Reactants Products Example: 2 Na + Cl2  2 NaCl
Inquiry: How are physical changes and chemical changes different?
Chemical Changes
Example:
2 Na + Cl2  2 NaCl
Reactants
Products Cl Cl Na Na + 
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16.  + 2 Na + Cl2 Reactants Products Example: 2 NaCl  Chemical Changes
Inquiry: How are physical changes and chemical changes different?
Chemical Changes
Example:
2 NaCl 
2 Na + Cl2
Reactants
Products Cl Cl Na Na  +
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17. Inquiry: How are physical changes and chemical changes different?
change where a chemical reaction occurred.
(New bonds between atoms where formed or broken)
How can you identify a chemical change?
The color might change
Energy (heat) can be released
The smell might change
A gas may be produced
A precipitate may form
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18. The reverse can also happen…
Inquiry: How are physical changes and chemical changes different?
The reverse can also happen…
2 NaCl 
2 Na + Cl2
Reactants (Re-act-ants):
The “stuff” (atoms and molecules)
you begin with.
Everything on the left of the arrow
Products:
The “stuff” (atoms and molecules)
you end up with.
Everything on the right of the arrow
2 NaCl
2 Na + Cl2
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19. Reactants: 4 Fe , 2 H2O, and 3 O2 Products: 2 Fe2O2 and 2 H2O
Inquiry: How are physical changes and chemical changes different?
Chemical Changes
Chemical changes are represented by Chemical Equations
Solid
Liquid
Gas
4 Fe(s) + 2 H2O(l) + 3 O2(g)  2 Fe2O3(s) H2O(l)
Reactants:
4 Fe , 2 H2O, and 3 O2
A nail rusting
Products:
2 Fe2O2 and 2 H2O
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20. Inquiry: How are physical changes and chemical changes different?
Iron Rusting
4 Fe(s) + 2 H2O(l) + 3 O2(g)  2 Fe2O3(s) H2O(l)
Reactants
( # of each element)
Products
(# of each element)
# of Fe atoms: _______
# of H atoms: _______
# of O atoms: _______
Total # of atoms: ______
# of Fe atoms: ________
# of H atoms: _________
# of O atoms: _________
Total # of atoms:________ 4 4 4 4 8 8 16 16

21.  Iron Rusting 4 Fe(s) + 2 H2O(l) + 3 O2(g)  2 Fe2O3(s) + 2 H2O(l) O

22. Examples of Physical Changes
Dissolving salt in water: It’s hard to tell whether a new substance forms when salt dissolves in water.
If we evaporate the water, we would get the salt back.
That makes it a physical change, because it is reversible.
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23. Changes of State State of Matter:
Solid
Liquid
Gas
Water turning to ice or to steam is always a reversible process.
Ice and steam are not new substances. They are still the same water particles, just arranged a bit differently.
Cooking and burning are always chemical changes.
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24. Question 1
When a cloud forms in the sky, is it a physical or a chemical change?
A) Physical change
B) Chemical change
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25. Question 1
When a cloud forms in the sky, is it a physical or a chemical change?
A) Physical change
B) Chemical change
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26. Question 2 Is rusting a physical or a chemical change?
A) Physical change
B) Chemical change
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27. Question 2 Is rusting a physical or a chemical change?
A) Physical change
B) Chemical change
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28. Summary In this presentation you have seen:
how to distinguish a physical change from a chemical change
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29. L.T: I can investigate some of the different characteristics of a chemical change.
Journal Entry:
Observe and record your observations for what happens when an antacid pill is placed into water.
b) Is it a physical change or a chemical change? Why?
c) What are the reactants?
d) What are the products?

30. L.T: I can investigate some of the different characteristics of a chemical change.
change where a chemical reaction occurred.
(New bonds between atoms where formed or broken)
How can you identify a chemical change?
The color might change
Energy (heat) can be released
The smell might change
A gas may be produced
A precipitate may form
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31. L.T: I can investigate some of the different characteristics
of a chemical change.
NaHCO3
CaCl2
C27H28Br2O5S
-For this investigation, when making observations you use:
a) Sight, b) Smell, c) Touch
-Do NOT taste any substance
-Use extreme care when handling glassware and the
substances.