for educational purposes only

2. Changes in Matter
in the Presence or
Absence of Oxygen

4. SING A SONG!
It’s SCIENCE TIME again
It’s SCIENCE TIME again
Oh! Let’s be happy, YES
It’s SCIENCE TIME again
(2X)

5. REVIEW:
Direction: Observe the following
materials. Shout HURRAY if they
are useful and shout HEP! HEP! if
they are harmful.

7. INSTRUCTION
S
 CLICK THE BOX TO OPEN IT
AND REVEAL THE MYSTERY
OBJECT OR TEXT.
 CLICK THE NEXT ICON AT THE
BOTTOM TO PROCEED TO THE
NEXT MYSTERY BOX.

8. 1
empty bottles
1

9. HURRAY
Empty bottles are useful because we can
create recycled plastic bottle supply cups,
reuse them as containers, DIY plastic bottle
planters, and many more.

10. 2
1. fruit and vegetable
peelings scattered on
the street
2

11. HEP! HEP!
Fruit and vegetable peelings scattered on
the street contribute a huge amount of
unnecessary waste to our landfills and
compost bins.

12. 3
1. expired medicine
3

13. HEP! HEP!
Expired medicines are at risk of bacterial
growth and sub-potent antibiotics can fail
to treat infections, leading to more serious
illnesses and antibiotic resistance.

14. 4
1. scratch papers
4

15. HURRAY
Scratch papers can be recycled to
turn them into new paper items.

16. 5
1. shattered glass
5

17. HEP! HEP!
Shattered glass penetrates the skin and
causes lacerations just like sharp,
needles, and razors.

18. UNLOCKING OF DIFFICULTIES
1. Matter
2. Changes
3. Observe
4. Presence
5. Absence
6. Oxygen

19. MATTER
is anything that has mass and takes up
space, whether solid, liquid, or gas

20. CHANGES
to make new forms

21. OBSERVE
look closely using different senses to
discover something

22. PRESENCE
being present in a place or thing

23. ABSENCE
being away in a place or thing

24. OXYGEN
a kind of gas that is a life-supporting
component of the air, 21 % of the
atmosphere is made of oxygen

25. SAFETY MEASURES
1. Follow the teacher’s procedures correctly.
2. Be careful with sharp tools.
3. Do not play while doing an experiment.
4. Wear proper clothing when needed.
5. Wash your hands after an experiment.

26. Experiment No. 1
Title: FIRE OUT!

27. Materials:
 1 small and 1 big jar
 2 small candles of the same sizes
 match
 timer
 ruler

28. PROCEDURE:
1. Light one of the candles.
2. Cover it with a small jar.
3. Using a timer, ask the pupils to record how many seconds it takes for
the flame of the candle to be put out.
4. The teacher will measure the length of a candle after it burned out.
5. Repeat the procedure using the next size of jar.
6. Let the children find out which jar has the longest time of candles to be
put out and the shortest time of candles to be put out

29. PUPILS TASK:
Observe and record your observation while
the teacher is doing an experiment.
Jars Time of the
flame was put
out
Length of the
candle before
burning
Length of the
candle after
burning
Small jar
Big jar

30. Answer the following questions:
1. What do you observe with the lighted candle
after it was covered with a jar?
The light of the lighted candle was put out when it
was covered with a jar.

31. Answer the following questions:
2. Which candle immediately put out its fire, is it the one
covered with a small jar, or the one covered with a big jar?
The candle that was covered with a small jar
immediately put out its fire.

32. Answer the following questions:
3. Why do you think the flame disappeared when
the candle was covered with a jar?
Lighted candles need oxygen from the air to
continue burning.
Without the presence of oxygen, the candles will
not continue to burn.

33. COMBUSTION
refers to the process where the substance burns in
the presence of oxygen
We can observe changes in the materials used in the
experiment under certain conditions:
PRESENCE OR LACK OF OXYGEN

34. Experiment No. 2
Title: OH, MY COLOR!

35. Materials:
 a piece of apple
 a piece of potato
 knife
 plate

36. PROCEDURE:
1. Cut the apple and potato into four.
2. Let the pupils observe the colors right after cutting.
3. Let the pupils observe their colors after a few minutes.
4. Let them record their observations.

37. Answer the following questions:
1. What do you observe with the color of the apple
and potato right after cutting?
The color of the apple and potato right after
cutting is yellowish.

38. Answer the following questions:
2. What do you observe with their colors after a
few minutes? Do you observe any changes?
The color of the apple and potato after a few
minutes changed.

39. In our second experiment, we observed that the colors of the
apple and potato changed from yellowish to brownish.

40. How this change happened?
The change in color of the inner fleshy part of
the apple and potato is due to their exposure
to oxygen. The same phenomena could also be
observed in other fruits and vegetables.

41. REMEMBER:
Food spoiled or changed its properties as a
result of oxygen reacting with the enzymes
found in the food.
This is called OXIDATION.

42. OXIDATION
is the combination of a substance with oxygen

43. COMBUSTION
OXIDATION
RUSTING

45. RUSTING
is caused by the reaction of iron with oxygen
present in the air. This kind of reaction is slower
than the rate of combustion. The amount of rust
formed in an iron depends on the moisture and
humidity of the surroundings.

46. HOW TO PREVENT RUSTING OF IRON?
1. Keep it clean.
2. Protect it from scratches.
3. Apply protective coat like paint.

47. We are able to investigate changes happening in some
materials under the following conditions:
THE PRESENCE OR ABSENCE OF OXYGEN

48. EVALUATION:
If the statement is TRUE, please click
FACT na FACT or check icon, and if
the statement is FALSE, click BLUFF
na BLUFF or wrong icon.

49. START

51. Fruits like apples and other
vegetables can change their colors
when exposed to oxygen.

54. If there is an absence of oxygen,
materials like candles will
continue to burn

57. Oxidation is the combination of a
substance with oxygen

60. Rusting can happen to materials
like wood and paper

63. Combustion refers to the process
where the substance burns in the
presence of oxygen