Physical and Chemical
Changes
Matter
 Anything
that has mass and takes up
space (has volume).
Matter
Pure
Substances
Elements
e.g. carbon
Compounds
e.g. CO2, H2O
Mixtures
Solutions
e.g. salt
water
Mechanical
Mixtures
e.g. pizza
Matter
Can be described as
 Physical
property – description of
substance. Ie. Colour, smell, taste,
density.
 Chemical
property – Describes how a
substance reacts when mixed with
other substances. ie. Gas burns in
heat and oxygen.
Physical Change

A change that does not produce a new
substance.

Usually reversible

e.g. melting ice, dissolving salt
Chemical Change
A
reaction takes place creating a new
substance.
 Usually
hard or
impossible to
reverse.
 Ex.
Cooking an egg
e.g. Gummy Bear Inferno Demo
Sugar + O2  Carbon Dioxide + H2O
In a chemical change, there are clues that a
change occurred. Can you name them?
There are 5 clues that a chemical
change may have occurred…
1. A new colour appears.
2. Heat or Light is given off.
3. Bubbles of Gas are formed.
4. A new solid material forms (precipitate).
5. A new odour is made.
What do you think?
1. Sugar dissolving in tea?
2. Breaking water up into
hydrogen and oxygen gas?
3. Burning a log in a campfire?
4. Crushing an Aspirin?
5. Metal Rusting?
6. Lighter fluid burning?
7. An egg rotting?
8. Boiling water?
9. Test tubes in picture  ?
Prepping your labs


Write in BLUE or BLACK pen only
Mistakes

Observations usually in a table (ruler)

All titles and subtitles underlined (ruler)


Date and name in the upper right corner with
lab partners name
Analysis must be in full sentences. That means
include the question in the answer
Physical and Chemical Changes Lab
Name:
LP:
Mar. 21, 2011
Purpose: To collect and use evidence to identify
physical and chemical changes.
Materials:
See Ms. Jamieson’s ppt
Procedure:
See Ms. Jamieson’s ppt
Observations:
Before
Exp. 1
Exp. 2
Exp. 3
During
After
Procedure:
Exp. 1
1. Add 2 cm of HCl to test tube
2. Add 2cm strip of Mg.
3. Dispose & Rinse test tube.
Exp. 2
1. Add 3 cm of distilled water to test tube
2. Add ½ pea size scoop of CuSO4
3. Shake gently (do not put thumb on top)
Exp. 3
1. Add pea size ball of steel wool to test tube used in #2
2. Shake gently (do not put thumb on top).
3. Dispose & Rinse test tube.
Exp. 4
1. Add 1cm of HCl to the test tube
2. Add 2 drops of phenolthalein.
3. Slowly add drops of NaOH while shaking gently until you
observe a change
4. Dispose & Rinse test tube.
Analysis:
1. Classify each of the experiments as chemical or
physical changes. Write a sentence to justify
your decision using specific evidence you’ve
observed.
2. Give one example from everyday life of a
physical change. Explain how to reverse it.
3. In your own words, how would you explain the
difference between a physical and chemical
change to a friend?