7. What is the difference
between insoluble
and soluble
substances?
REVIEW
8. The teacher will present a story and the
learners will read and understand. After
reading the teacher will ask questions
about the story.
Objective:
at the end of the story, learners will be able to
identify/recognize their new topic.
“COUGH SYRUP”
9. “COUGH SYRUP”
Once upon a time in the City of
Bayugan, there lived a friendly
pharmacist named Dr. Marvin. He
was known for her colorful apron and
his magical pharmacy, where he
could create special medicines to help
all the Bayuganon people feel better.
10. One sunny morning, a young girl named
Mia came into Dr. Marvin's pharmacy
with a persistent cough. Mia's mom,
worried about her little one, asked Dr.
Marvin for help. Dr. Marvin listened
carefully to Mia's cough and decided to
make a special cough syrup. He explained
to Mia's mom that this syrup would have
two important ingredients honey for
soothing the throat and guaifenesin for
breaking up the mucus in the chest.
11. But Dr. Marvin knew that for medicine
to work just right, he needed to be very
precise with his measurements. He
needed to figure out the percent by mass
for the honey and the percent by volume
for the guaifenesin.
For the honey, Dr. Marvin weighed 10
grams of it to make sure it was 20% of the
total mass of the syrup. He gently stirred
it into the mixture, knowing that it would
make the syrup sweet and comforting.
12. Next, for the guaifenesin, she carefully
measured 5 milliliters of it because he
wanted it to be 10% of the total volume of
the syrup. He added it to the mixture and
mixed it thoroughly. Guaifenesin would
help Mia's body get rid of the mucus that
was causing her cough.
Dr. Marvin knew that getting the right
concentrations was important to make the
medicine work effectively. He poured the
finished cough syrup into a small, colorful
bottle and handed it to Mia's mom, who
was grateful for Dr. Marvin's magical
potion.
13. Mia took the syrup as instructed, and soon
her cough began to improve. She no longer felt
irritated, and her throat was soothed by the
honey. The guaifenesin worked its magic to clear
her chest, and Mia was soon back to her
cheerful self, playing with her friends in
Bayugan city.
Dr. Marvin's special cough syrup, made with the
perfect percentages of honey and guaifenesin,
had worked wonders. It was a reminder to
everyone in Bayugan city that even in medicine,
a little bit of magic combined with careful
measurements could make a big difference in
helping people feel better.
14. Question :
1.What was the story all about?
2. How did Dr. Marvin made the
syrup?
3. What will happen if the
concentration of a solution is not
right?
16. Objectives : at the end of the lesson, learners will be able
to.
A. define concentration of solution;
B. describe the concentration of a
solution;
C. solve percentage by mass and volume
related
problems.
D. appreciate the importance of
understanding the
concentration of a solution.
17. UNLOCKING OF DIFFICULTIES
Concentration of solution refers to the measure of the amount of
solute that has been dissolved in a solvent or solution.
Quantitative measurement of concentration is used to tell us the
amount (expressed in numbers) of solute present in a solution.
Dilute solution has a low concentration of the solute compared to
the solvent.
Concentrated solution is one in which there is a large amount of
solute present in a solution.
Percent by volume is the amount of solute in each volume of
solution expressed as milliliters solute per 100 milliliters of solution
(ml/100 mL).
Percent by mass is the amount of solute in each mass of solvent
expressed as gram solute per 100 grams of solution.
18. “SOLVE ME, KNOW ME”
Objective:
at the end of the lesson, learners will be able to
understand and solve the percent by mass and percent
by volume.
This time we will be having an activity and this
activity is entitled “SOLVE ME, KNOW ME”. I have
here four different envelope and each envelope has
their own task, what you need to do is to analyze the
given task and answer the guide questions. After
10minutes each group must select representative to
report their answer in class.
19. 10 (Outstanding) the content was delivered
excellently with confidence. All group members
work together to accomplish the task.
8 (Satisfactory) the content was delivered
satisfactorily with mannerism. 80% of the group
members worked together to accomplish the task.
5 (Developing) the content was delivered poorly
with little confidence. 50% of the group
members worked together to accomplish the task.
RUBRICS
28. Is it important to have a
proper amount of substance
in making a solution?
29. In times of pandemic, Liza a professional
chemist is asked to make of 70% alcohol
solution. She made 800 pieces of 250ml
solution of alcohol then handed to her
nephew Gerald to sale in the market in low
price to help their neighbors. Gerald, asked
what is the volume of alcohol that the
solution contain? Liza instructed Gerald to
solve so that he can answer his own question.
Now can you help Gerald to solve?
SITUATION:
30.
31. Directions: Choose the letter of the correct
answer.
1. A solution is prepared by mixing
30ml of ethyl alcohol in 70ml of water.
What are the concentrations of the
solute and solvent in % by mass?
A. Solute 42%, solvent 58%
B. Solute 58%, solvent 42%
C. Solute 30%, solvent 70%
D. Solute 70%, solvent 30%
32. 2. Billy prepares four (4) different
concentrations of solutions. Which solution is
the most concentrated?
A. 35 g of salt in 100 ml of water
B. 40 g of salt in 100 ml of water
C. 50 g of salt in 100 ml of water
D. 75 g of salt in 100 ml of water
33. 3. Which is the ratio of the mass
of solute to the mass of solution
multiplied by 100%?
A. Percent by mass
B. Percent by solute
C. Percent by volume
D. Percent by solution
34. 4. Which refers to the amount of
solute present in a solution?
A. Concentration of water
B. Concentration of solute
C. Concentration of solvent
D. Concentration of solution
35. 5. Which solution is highly
concentrated?
A. 80% saline solution
B. 40% alcohol solution
C. 70% alcohol solution
D. 90% acetic acid solution
36. 6. In times of pandemic, the use of
70% alcohol solution is highly
recommended. If you bought a 250ml
solution, what is the volume of alcohol
that the solution
contains?
A. 28 ml
B. 75 ml
C. 175 ml
D. 180 ml
37. 7. Gina has an 18-karat gold bracelet, and a
70% isopropyl alcohol. She wonders.
which of these two solutions is more
concentrated. Which one is it?
A. They both have the concentration.
B. The18 karat gold bracelet is more
concentrated
C. The 70% isopropyl alcohol is more
concentrated.
D. The concentrations of the two solutions
cannot be compared.
38. 8. Which is more concentrated a fine silver
which contains 99.9% silver or a 24- karat
gold?
A. The fine silver is more concentrated
B. They both have similar concentration.
C. The 24-karat gold is more concentrated.
D. The concentrations of the two solutions
cannot be compared.
39. 9. Due to COVID-19 pandemic, Joey finds it interesting
if he can solve the volume of alcohol content in a 250 ml
bottle solution in 70% concentration using this formula:
𝑃𝑒𝑟𝑐𝑒𝑛𝑡 𝑏𝑦 𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑒 = 𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑒
𝑣𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑖𝑜𝑛 𝑥 100%
Is he correct?
A. No, he must use a different formula.
B. No, because the volume of the solute is not given.
C. Yes, all the right values are present in the equation.
D. Yes, he must use the percent by mass formula to get it
right
40. 10. Leah finds out that the alcohol she bought from the store is 90% alcohol.
She plans to dilute the solution to 70%. These are the steps to be considered:
I. Identify the solute and the solvent in the solution.
II. Find the right dilution equation and fill it with the correct values.
III. Calculate the amount of solute needed and add it to the solution.
IV. Calculate the amount of solvent needed and add it to the solution.
Which of these steps must she consider and in what order?
A. II-III-IV
B. I-III-IV
C. II-I-III
D. I-II-I
41. Direction: Solve the following problem. Show your solution.
1. How much grams of NaCl are present in a 250grams salt
solution containing 9% NaCl
2. What is the percent by mass concentration of a solution
that contains 5.30g of salt dissolved in 19.7g of water?
3. What is the percent by volume of isopropanol in a 90ml
solution that contains 25mL isopropanol?
42. 1.What is the percent by mass of a salt solution by dissolving
11grams od salt in 80grams of solution?
2. Express the concentration of a solution prepared by dissolving 90
grams of salt in 400grams of water.
3 A solution is prepared by mixing 30 ml of C2H5OH(ethanol) in
600mL of distilled water. What is the percent by volume
concentration of the solution?
4. What is the volume of alcohol is required to prepare 300mL of a
30% by volume solution?
