Lesson Plan
GRADE 7 CHEMISTRY
CONCENTRATION OF SOLUTIONS
Objectives:
Described the soutions as having quantitative and qualitative concentrations.
Distinguished dilute from concentrated solutions
Computed the concentration of solutons through percent by volume and percent by mass.
Lesson Development:
Teacher’s Activity Student’s Activity Teacher’s Remarks/Notes
Engagement Your past lesson was solubility. What “Unsaturated,
10 mins are the three tyes of solution based on saturatrd and
their solubility? supersaturated.”
“what is an unsaturated solution?, “..“
saturated?, supersaturated?”
“So now let’s move on. But before “Yes Ma’am!”
anything else, do you want a game
before we start our discussion?”
“Everybody please stand up and form a The whole class will form a big
big circle.” circle.
“We’re going to play Concentration. “Yes we are!”
Are you familiar with that game?”
“Alright. Let’s start.” The game will start.
The students will recite with
the beat of their hands.
After 15 rounds, the game will
end.
“Did you enjoy the game?” “Yes Ma’am”
“It’s good that you enjoyed the game The teacher will introduce the
because you really need to concentrate topic and the lesson objectives.
during our discussion of our next topic
and this is all about concentration of
solutions. At the end of the discussion,
you should be able to:
Describe the soutions as having
quantitative and qualitative
concentrations.
Distinguish dilute from
concentrated solutions
Computed the concentration of
solutons through percent by volume
and percent by mass.’
Exploration “I have here something. Do you know “Powdered juice The teacher will prepare two
10 mins what is this?” Ma’am” similar solutions that differ in
concentration.
“Can you guess what am I going to do
with this?” “You will make us She will be the one to
some drinks Ma’am” demonsrate the activity for the
whole class.
“I am going to dissolve this but we’re The teacher will pour half tsp
not gonna drink it. Observe carefully of powdered juice in a 50 mL
because I prepared some easy questions glass of water.
for you.
2 tsp of powdered juice will be
poured again on another 50 mL
glass of water.
“In which glass did I put less amount of “In the first glass” Then the teacher will ask
powdered juice?” questions.
“What is its appearance?” “It is pale”
“How about the most amount of “In the second glass”
powdered juice?”
“What is its appearance?” “It is darker in
color”
“Very good”
“We made two similar solutions but
they differ in concentrations. The other
is less concentrated and the other is
more concentrated”
Explanation “Based on what you have observed in The teacher will let the students
30 mins the activity earlier, what do we mean answer the question on their
when we say concentration of own words. The answers may
solution?” vary.
“Everybody please read” “Concentration After listening to the students’
describes the relative definition, the teacher will post
amounts of solute the contextual definition of
and solvent in a concentration, concentrated
given volume of solution and dilute solution on
“And we have 2 types of solution based solution.” the board and let the students to
on their concentrations.” read it.
“One is the concentrated solution and ‘ . . .” The teacher will go back to the
the other is dilute solution.” 2 solutions made earlier and
“Which of the 2 is the concentrated will let the students tell where
solution?, the dilute solution? “The second glass, is the concentrated solution and
the first glass.” the dilute solution.
“Very good!”
“We can also describe the concentrati The teacher will write a table
on of solution in a quantitative and on the board and discuss it.
qualitative way” Quantitative Qualitative
Glass 1 1 2 dark
“The quantitative way of describing is tsp/50 mL
using a standard value, an absolute, Glass 2 2 tsp/50 mL pale
measurable, and countable data. And
the opposite of it is the qualitative way The teacher may give more
of describing.” examples.
“Now that you have distinguished
dilute from concentrated solutions
quantitatively and qualitatively, you can
also express concentration in other
ways such as percent by volume and
percent by mass.
“Please read the definition of these “Percent by volume,
two.” which is the amount
of solute in a given
volume of solution
expressed as grams
of solute per 100
mililiter of solution.”
“Percent by mass
which is the amount
of solute in a given
mass of solvent
express as grams
solute per 100 grams
of solution”
Formula:
mLOfSolute Percent by The teacher will give different
mLOfSoluti on volume = examples.
x100
Elaboration Teach them shortcuts.
5 mins
Evaluation 1. The teacher will give a
5 mins 2. homework as an evaluation
3. tool.
