2. Sort me where I belong
In this activity, you are to work with your group
members in classifying the photos and
descriptions whether physical or chemical
change.
3. Physical Change Chemical Change
A change that does not
change the identity of a
substance; it is the same
but might look and feel
different.
A change that changes the
identity of a substance;
something new was
created that was not there
before.
Broken pencil Rusting of iron
Chopping of wood Baking a cake
Melting of butter Rotten Tomatoes
Frying an egg
Burning of wood
4. What other description can we
associate with the following
words? Choose your answer
from the given descriptions
reflected on our monitor.
5. What other description can we associate with the following
words? Choose your answer from the given descriptions reflected
on our monitor.
1. Evidence
2. Precipitate
3. temperature
4. odor
5. color
6. gas
7. light
a. A solid which is formed when two solids combined and react.
b. A quality such as red, blue, green , yellow etc. that you see when you
look at something
c. An outward sign or proof. An indicator
d. hotness or coldness of an object
e. A quality of something that stimulates the sense of smell.
f. A substance such as Oxygen and Carbon dioxide which can be seen as
bubbles rising to the surface of the mixture.
g. visible radiation; a flame
8. Work in groups and do each experiment by
following procedures correctly.
For each of these experiment,
1. Write your observations.
2. And complete the table attached to the
activity sheets.
3. Answer the questions that follows.
9. Before you proceed remember the
following:
1. Use chemicals with caution. Do
not taste any substance unless you
are told to do so.
2. Clean up thoroughly when you
are finished.
3. Employ safe practices at all
times. Your safety is important.
11. You have 5 minutes to complete the activity.
After 15 minutes you are going to post your output on
the board. Group speaker be ready to discuss the
result of your laboratory activity.
Are you ready?
Your 5 minutes start now!
16. Experiment 2
Milk + coke soda
The reaction of Milk and coke can be written like the one below.
Calcium + Phosphoric Acid Calcium phosphate + Hydrogen
gas
( precipitate )
17. Studies shows that High levels of
Phosphoric acid in consuming
repeated quantities of soft drinks
might increase the chance of
Osteoporosis.
21. * Evolution of gas
EVIDENCE OF CHEMICAL CHANGE
Formation of
Precipitate
22. Experiment 3
Urea + milk
Urea, also known as carbamide, is an organic compound
with chemical formula CO(NH2)2 which is used as organic
fertilizer.
Urea is in crystalline form so as it dissolves it absorbs the
energy making the mixture cold.
25. Experiment 4
Baking soda + vinegar
Baking soda + acetic acid sodium acetate + water + carbon dioxide
What gas has evolve when you mixed baking soda and vinegar as shown on
your experiment?
26. What evidence of chemical change
will prove that experiment # 4 on
vinegar and baking soda is a
chemical change.
30. Theory of oxidation
“ Materials accurately burn as it reacts with oxygen.”
According to Antoine Lavoisier
Oxygen is vital to life but one interesting reaction that
involves oxygen is the production of fire.
35. Directions:
1. In baking biscuits and other quick breads, the baking powder reacts
to release carbon dioxide bubbles. The carbon dioxide bubbles cause
the dough to rise.
Determine if a chemical change has taken place and provide
proof by checking the appropriate evidence. Check all that
apply.
Production of Light
Evolution of gas ( bubbles formed in the
solution )
Change in temperature.
Change in color
Change in odor/smell
Formation of precipitate
36. 2. Your friend decides to toast a piece of bread, but leaves it in the
toaster too long. The bread becomes black .
Production of Light
Evolution of gas ( bubbles formed in the
solution )
Change in temperature.
Change in color
Change in odor/smell
Formation of precipitate
37. 3. In a fireworks show, the fireworks explode giving off heat and light.
Production of Light
Evolution of gas ( bubbles formed in the
solution )
Change in temperature.
Change in color
Change in odor/smell
Formation of precipitate
38. 4. Rotten bananas
Production of Light
Evolution of gas ( bubbles formed in the
solution )
Change in temperature.
Change in color
Change in odor/smell
Formation of precipitate
39. 5. Two clear substance when mixed produces a bright yellow solid.
Production of Light
Evolution of gas ( bubbles formed in the
solution )
Change in temperature.
Change in color
Change in odor/smell
Formation of precipitate
Sodium Hydroxide is commonly known as caustic soda.
Phenolpthalein is used as indicator in acid-base titrations.
NaOH is used in the manufacture of soap , explosives and petroleum products.
Phenolpthalein is colorless when mix with an acid and turns pink when mix with a base.
Silver Nitrate is used as a topical ointment in treating wounds and burns.
Silver nitrate when mix with sodium hydroxide forms a solid precipitate called silver hydroxide.
Silver Nitrate and Sodium Carbonate when mix form a solid called silver carbonate.
