A Semi-detailed Lesson Plan
in Science and Technology 7
Prepared by: Henry B. Sergio Jr.
Content Standard: The learners demonstrate an understanding of the properties of substances that distinguish them from mixtures.
Performance Standard: The learners should be able to investigate the properties of mixtures of varying concentrations using variable materials in the
community for specific purposes.
Week: 4, Day: 4
I. Learning
Objectives
II. Learning
Content
III. Learning Procedure
(Application Lesson)
IV. Evaluation IV. Assignment
Through a problem
analysis about the
different separation
techniques, the
students should be
able to:
A. differentiate the
different separation
techniques;
B. appreciate the roll
of Science in everyday
life by solving a given
problem related to
real-life situation and;
C. adapt the lesson in
common separation
techniques to be in
the community for
specific purposes.
A.Subject Matter:
Common Separation
Techniques
B. Reference:
Hadsal, A.S.
(2008).Exploring
science and
technology II. Diwa
learning system, Inc.
C. Materials:
 Pictures of the
different
separation
techniques.
D. Concepts:
1. Filtration-this is the
separation technique
where two miscible
liquids (liquids that
mix together) are
separated.
2. Chromatography -
is the separation
technique used to
separate soluble
substances using a
media and a solvent.
3. Sifting is a method
in which you use the
property of size to
*Preliminary Assessment
Review Quiz: Select the best answer.
1. What does the term 'filtrate' means
a. the liquid that passes through the filter paper
b. solid particles that decompose upon heating
c. the liquid that evaporates from a solution
d. solid particles that are left behind after
filtration on the filter paper
2. If I know the components of a mixture
and the boiling points of the
components, which is a possible way to
isolate the components in the mixture?
a. Make use of evaporation
b. Make use of magnetic attraction
c. Make use of fractional distillation
d. Make use of paper chromatography
3. When do we use evaporation to
separate components?
a. a solid-solid mixture when one of the
components sublimes
b. a liquid-solid mixture when solid
particles can be seen in the mixture
c. a solid-liquid mixture when solid
particles are dissolved
d. a liquid-liquid mixture when one of
the liquids has a lower boiling point
Direction:
Think carefully about
the following
statements. Are they
true or false?
Circle your answer.
a. In filtration, the
filtrate is always a pure
liquid. True/False
b. Drinking water
can only be obtained
from seawater by
distillation.
True/False
c. The fractional
distillation of miscible
liquids is only possible if
the liquids have
different boiling points.
True/False
d. Paper
chromatography is a
physical method for
separating mixtures.
True/False
e. Mixtures have
fixed melting and
boiling points.
True/False
On a short bond paper
with 0.5 inches on all
sides as margin, make
a collage of the
different examples of
mixtures and
substances that we see
at the environment. To
be passed on Friday,
December 11, 2014.
Criteria:
Cleanliness-5 points
Appropriate choice of
pictures-10 points
Artistry-5 points
Total: 20 points

separate mixtures.
4. Evaporation-the
liquid portion of the
solution is allowed to
evaporate, leaving
the solute behind.
5. Magnetism can be
used to separate
mixtures.
E. Skills:
Investigating the
properties of mixtures
applying it to real life
situations.
F. Values
A problem is not
solved with only one
solution. You have to
explore other
alternatives.
4. Which separation technique do you use
to separate a magnetic substance from
a non-magnetic substance?
a. filtration
b. chromatography
c. magnetic attraction
d. distillation
e. evaporation
5. Which apparatus are not needed for
the set-up when separation by
evaporation is used?
a. filter paper
b. bunsen burner
c. tripod stand
d. solution
e. wire gauze
A. Motivation
1. Let the students watch a lego
assembled toy. (The video is about a
robot toy assembled using lego bricks)

2. The robot is made up of the lego bricks.
In what way does this imply in us?
Everything is made up of components that
combine together to create a thing. It is
these components that make us. As for our
topic for today, we will tackle about the
different separation techniques to see the
components of mixtures.
B. Statement of the Problem

You are all chemists/engineers who
live in the same town and work for the same
company. A river runs through your town and
the water comes from three smaller rivers that
pass through three big cities. Recently, your
town ran out of drinking water and your non-chemist,
non-engineer neighbors have been
drinking the water from the river. A few days
later, many of your neighbors started feeling
sick. You suspected the river water and half
of you went to City No. 1 and the other half
went to City No. 2 to see what is in their river.
In City No. 1, you saw that a factory is right
next to the river and they have been putting
chemicals in the river. In City No. 2, the other
half of you saw that the water appears to be
clean but have a lot of sand in it. You are
now asked to come up with a way to
separate the chemicals from the water in City
No. 1 and the sand from the water in City No.
2. A separate group of chemists/engineers
went to City No. 3 and found that ethanol
and salt are in their river water. That means a
mixture of water, ethanol (isopropanol),
acetone, salt, and sand is in the river that runs
through your town. Remember, your town is
out of drinking water, so you must clean the
river water and separate all the chemicals,
salt, and sand from the river water to have
drinking water!!!

C. Necessity of Information
1. Separation of mixtures by paper
chromatography
This method is often used in the food
industry. It is used to identify chemicals
(coloring agents) in foods or inks. For
example, if a scientist wants to know how
many substances are in a particular blob of
ink, paper chromatography can be used.
2. Filtration separation method
This is a more common method of
separating an insoluble solid from a liquid.
An example of such a mixture is sand and
water. Filtration is used in water treatment
plants, where water from the river is filtered
to remove solid particles.

3. Evaporation Separation Method
Evaporation is the process by which water
(and other liquids) changes from a liquid
state to a vapor or gas state. Evaporation is
great for separating a mixture (solution) of a
soluble solid and a solvent. The process
involves heating the solution until the solvent
evaporates (turns into gas)
leaving behind the solid residue.
4. Magnetism
Magnetism is ideal for separating mixtures of
two solids with one part having magnetic
properties. Some metals like iron, nickel and
cobalt have magnetic properties while gold,
silver and aluminum do not. Magnetic
elements are attracted to a magnet.
5. Separation through sifting

Sifting is used to separate a dry mixture
which contains substances of different sizes
by passing it through a sieve, a device
containing tiny holes.
6. Based on our discussion, how can the
engineers/chemist separate the
different components of the water in
the river?
The sand can be separation by using filters,
i.e. coffee filters, paper towel. The salt will
dissolve in the mixture. As the mixture is
heated, acetone will vaporize, followed by
ethanol or isopropanol. Lastly, water can
be boiled off or let stand to vaporize to
obtain salt crystals.)

*Final Assessment
Select the best answer. Letters only.
1. Which is the best way to get salt from
salty water?
a. evaporation
b. filtration
c. distillation
2. Pure water can be separated from inky
water by simple distillation. This is
because:
a. water and ink have different boiling
points.
b. water evaporates leaving the ink
particles behind.
c. ink evaporates leaving the water
behind.
3. What is the correct order for obtaining
salt from a mixture of sand and salt?
a. dissolving in water - filtration -
evaporation
b. evaporation - filtration - dissolving in
water
c. filtration - dissolving in water -
evaporation