Republic of the Philippines
DEPARTMENT OF EDUCATION
Region 8 (Eastern Visayas)
Division of Lete
Palo, Leyte
INOPACAN NATIONAL HIGH SCHOOL
Inopacan, Leyte
CONTEXTUALIZED LESSON PLAN IN SCIENCE GRADE 7
I.
Objective
A. Content Standard
B.
Performance Standard
C. Learning Competency
The learner demonstrates understanding of the common properties of acidic and
basic mixtures
The learners independently properly interpret product labels of acidic and basic
mixture, and practice safe ways of handling acids and bases using protective
clothing and safety gear
Investigate properties of acidic and basic mixtures using natural indicators; and
S7MT-Ii-6
Subtask: Identifies household materials if its acidic or basic using the made plant
indicator
KBI: Gains knowledge or information of the health benefits and medicinal properties
derived from gumamela, mayana leaves and eggplant skin.
II.
Content and Materials
A. Topic
B. Reference
C. Materials
D. Concept
E.
Local Heritage Theme
III.
Procedure
Acids and Bases
Science Learners Material pp. 46-47
Mayana leaves/gumamela/eggplant skin, tawas, 500 ml beaker, stirrer, alcohol
lamp, gauze, tripod, bottle,
The concept of plant indicators recognizes that plant communities are distinct
entities developed and arranged.in accordance with definite biological laws; they
are not mere aggregations of plants brought together by chance. Such plant
communities are well differentiated and are very constant for the same site type
1. Flora and Fauna- Egg plant, Mayana Leaves and Eggplant Skin
2. Household Materials- Calamansi, Distilled water, Toothpaste, Shampoo, Vinegar
Tap water, Soap
Prayer
Checking of Attendance
Review
Everyone will pray the Lord’s Prayer
To be checked by the class monitor
TRUE or FALSE
Learners will raise the word TRUE if the statement is correct and FALSE if not.
1. Gastric Juice is ten times more acidic than battery.
2. Acidic foods can be determined because of its salty taste.
3. Basic foods can be determined because of its bitter taste.
4. The ph of blood is 8.
5. Blue litmus paper turns to red if it is acidic.
Motivation
Show a picture to the learners of the pH range of the different products that are
commonly found at home.
Ask learners the following:
1. What is the photo being presented?
2.
3.
4.
Presentation of the Lesson
A. Activity
What are other ways to know if a product is acid or base if pH scale
indicator is not available?
What is a plant indicator?
How will you make it?
Group Activity
The learners will be grouped into 5, each of the learners will have to assign each
individuals to do an assigned task. The learners will be given a paraphernalia for
the said Laboratory activities with the procedures in it. They will only be given an
hour to the said activity.
Materials Needed for the activity:
1. Dark Violet Eggplant
2. Mayana leaves
3. Gumamela
4. Tawas
5. Peeler
6. Milk can
7. Plastic cups
8. Brown bottle with cover
9. Alcohol lamp
10. Tripod
B.
Analysis
C. Abstraction
Procedure
1. Peel an eggplant as thin as possible. (You may also use the skin of purple camote
or the leaves of red mayana or Baston ni San Jose.)
Cut the materials into small pieces and place in a small casserole or milk can. You
may keep the flesh of the eggplant or camote for other purposes.
2. Add about ⅓ to ½ cup tap water to the peel depending on the size of the
eggplant or camote used. Boil for 5 minutes. Stir from time to time.
3. Transfer the mixture into a bottle while it is still hot. There is no need to filter, just
remove the solid portion. The mixture may change if left in open air for more than
5 minutes.
4. Immediately add a pinch (2-3 matchstick head size) of alum (tawas) powder into
the solution or until the solution becomes dark blue in color. Stir well while still hot.
This is now the indicator solution.
Note: Alum will stabilize the extract. The extract will be more stable with alum but it
is recommended that the solution be used within a few days. Keep the extract in the
refrigerator or cool dark place when not in use
Ask the learners the following questions:
1. What do you think about the activity?
2. What have you noticed on the water while it was boiling?
3. How is it possible that the color of the water changed?
4. What happened when you add a pinch of alum powder in the solution?
5. What are the differences in terms of color between mayana leaves,
eggplant skin and gumamela?
Show the learners a photo showing the different edible pH indicator color
changes.
Ask learners the following:
D. Application
IV.
Evaluation
1. What have you noticed on the picture presented?
2. What is the use of a plant indicator?
3. Are all plant indicator the same pH indicator color? Why not?
The learners will prepare the plant indicator paper.
Identify the following household materials if its acidic or basic using the made plant
indicator.
1.
2.
4.
V.
Assignment
Prepared by:
SARA JOY L. BERNALES
Subject Teacher
Approved by:
ALEJANDRO P. RENOMERON
Principal II
3.
5.
Bring the following materials for the next meeting:
1. Rain water
2. River, lake, stream water
3. Pond
4. Canal
5. Water from faucet
6. Deep well or hand pump
7. Bottled water
Checked by:
JASMIN M. RAMIREZ
Master Teacher I
YVONNE R. GONZALES
Science Coordinator