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1. TO TEACHER JULIE CHANNEL

2. SCIENCE 7 First QUARTER- lc 8.1 Matatag curriculum WITH FREE POWERPOINT PRESENTATION LESSON 1: Properties of Solutions

3. Properties of Solutions CONTENT The learners shall learn the properties of solutions such as solubility and reaction to litmus determine their use. LEARNING STANDARD The learners shall be able to identify the role of the solute and solvent in a solution and to express quantitatively the amount of solute present in a given volume of solution. LEARNING COMPETENCY

4. By the end of the lesson, the 80 percent of the learners will be able to: Define the term "solution" and identify its key components (solute and solvent). Demonstrate the ability to set up and conduct laboratory experiments to investigate the properties of solutions. Appreciate the importance of understanding solution properties by answering reflections. OBJECTIVES

5. I. Activating Prior Knowledge "What is a solution?“ I. Activating Prior Knowledge

6. I. Activating Prior Knowledge "What is a solution?“ I. Activating Prior Knowledge Definition: A solution is a homogeneous mixture composed of two or more substances. It consists of a solute dissolved in a solvent.

7. I. Activating Prior Knowledge "Can you name some examples of solutions?" I. Activating Prior Knowledge

8. I. Activating Prior Knowledge "Can you name some examples of solutions?" I. Activating Prior Knowledge Examples may include: Saltwater Sugary drinks Copper sulfate in water Alcohol in water Oxygen in the air

9. I. Activating Prior Knowledge "What are the main components of a solution ?" I. Activating Prior Knowledge

10. I. Activating Prior Knowledge "What are the main components of a solution ?" I. Activating Prior Knowledge Solute: The substance that is dissolved in the solvent. Solvent: The dissolving medium that dissolves the solute .

11. In this lesson, we will be exploring the key properties and characteristics of solutions. Emphasize the importance of understanding solution properties, as this knowledge is fundamental to many areas of chemistry and science. B. Establishing Purpose of the Lesson 1. LESSON PURPOSE

12. B. Establishing Purpose of the Lesson 2. Unlocking Content Vocabulary: Match Type Activity Solute Solvent Solubility is the substance that is dissolved in the solvent to form a solution. is the dissolving medium that dissolves the solute to form a solution. is the ability of a substance (solute) to dissolve in a given solvent to form a solution. Solution a homogeneous mixture composed of two or more substances.

13. C. Developing and Deepening Understanding Definition: A solution is a homogeneous mixture composed of two or more substances. It consists of a solute dissolved in a solvent. Defining Solutions

14. C. Developing and Deepening Understanding Solute: The substance that is dissolved in the solvent. Solvent: The dissolving medium that dissolves the solute. Components of a Solution

15. C. Developing and Deepening Understanding Temperature: As temperature increases, the solubility of most solids and gases in liquids increases. Pressure: Increasing pressure generally increases the solubility of gases in liquids. Polarity: Polar solutes tend to dissolve in polar solvents, and non-polar solutes tend to dissolve in non-polar solvents. Factors Affecting Solubility

16. C. Developing and Deepening Understanding Concentration: The measure of the amount of solute dissolved in a given amount of solvent or solution. Measuring Concentration

17. C. Developing and Deepening Understanding Different ways to express concentration: Molarity : Moles of solute per liter of solution. Molality: Moles of solute per kilogram of solvent. Mole fraction: The ratio of the moles of solute to the total moles of all components in a solution. Measuring Concentration

18. C. Developing and Deepening Understanding Colligative properties: Properties that depend on the concentration of the solute, not its identity. Colligative Properties

19. C. Developing and Deepening Understanding The presence of a solute in a solution increases the boiling point of the solution compared to the pure solvent The extent of the boiling point elevation depends on the concentration of the solute. Boiling Point Elevation

20. C. Developing and Deepening Understanding The presence of a solute in a solution decreases the freezing point of the solution compared to the pure solvent. The extent of the freezing point depression depends on the concentration of the solute. Freezing Point Depression

21. C. Developing and Deepening Understanding Osmotic pressure is the pressure that must be applied to a solution to prevent the flow of water molecules through a semipermeable membrane. Osmotic pressure depends on the concentration of the solute in the solution . Osmotic Pressure

22. C. Developing and Deepening Understanding Worked Example Properties of Solutions The learners will bring the following materials to perform a simple activity that highlights the properties of solution. Materials: sugar transparent plastic cups of similar sizes salt 6 cups of water mongo seeds 6 pieces spoons powdered juice cheesecloth

23. C. Developing and Deepening Understanding Worked Example Properties of Solutions Procedure: 1. Predict which among the given samples will dissolve in water. Write your predictions in Column 2 of Table 1. 2. Put one cup of water in each of the cups. 3. Add ½ teaspoon of each of the six samples. Use the teaspoon to mix thoroughly as much of each sample as possible. Use a different teaspoon for each of the cups. 4. Filter the mixture with filter paper using a setup like Figure 1. You may use cheesecloth or old, white Tshirt with the improvised funnel from the cut upper portion of the plastic bottle.

24. C. Developing and Deepening Understanding Worked Example

25. C. Developing and Deepening Understanding Worked Example Guide Questions: 1. Describe the mixture that resulted after mixing. Write your answer in Column 3 of Table 1. 2. How many phases have you observed? Write your answer and observations in Column 4. 3. Identify the solute in each of the mixtures. Write your answers on the space provided below. 4. What is the solvent in each of the mixtures? 5. In which mixture were you able to separate the components (solute and solvent) by filtration? Write your observations in column 5 of Table 1. 6. Which of the samples are solutions? Write your answers in Column 7. Do you consider solutions as homogeneous mixtures? Why? Why not?

26. D. MAKING GENERALIZATION D. MAKING GENERALIZATION Learners’ Takeaways The learners will write down in the box the words or phrases which can be associated with the properties of solution. Has this lesson helped you better understand the properties of solutions? If so, how?

27. E. EVALUATING LEARNING E. EVALUATING LEARNING E. EVALUATING LEARNING __________1 Which of the following is a characteristic of a solution? Heterogeneous mixture Solute particles larger than 1 nanometer Separation of components over time Homogeneous mixture

28. E. EVALUATING LEARNING E. EVALUATING LEARNING E. EVALUATING LEARNING __________2. The solubility of a gas in a liquid typically __________ as the temperature increases. Increases Decreases Remains the same Depends on the pressure

29. E. EVALUATING LEARNING E. EVALUATING LEARNING E. EVALUATING LEARNING __________3. Which of the following is a colligative property of solutions? Boiling point elevation Density pH Both a and b

30. E. EVALUATING LEARNING E. EVALUATING LEARNING E. EVALUATING LEARNING __________4. The measure of the amount of solute dissolved in a given amount of solvent or solution is known as: Molarity Molality Mole fraction All of the above

31. E. EVALUATING LEARNING E. EVALUATING LEARNING E. EVALUATING LEARNING __________5. Osmotic pressure is the pressure that must be applied to a solution to: Increase the boiling point Decrease the freezing point Prevent the flow of water molecules through a semipermeable membrane Increase the solubility of the solute

32. E. EVALUATING LEARNING E. EVALUATING LEARNING E. EVALUATING LEARNING __________6. Which of the following statements about solutions is true? Solutions are always clear and transparent. Solutions are stable and do not separate into distinct layers. Solutions have a uniform composition throughout. All of the above

33. E. EVALUATING LEARNING E. EVALUATING LEARNING E. EVALUATING LEARNING __________7. Which of the following is the most accurate way to express the concentration of a solution? Grams of solute per liter of solution Milliliters of solute per milliliters of solution Moles of solute per liter of solution Grams of solute per grams of solution

34. E. EVALUATING LEARNING E. EVALUATING LEARNING E. EVALUATING LEARNING __________8. The decrease in the freezing point of a solution compared to the pure solvent is known as: Boiling point elevation Freezing point depression Osmotic pressure Solubility

35. E. EVALUATING LEARNING E. EVALUATING LEARNING E. EVALUATING LEARNING __________9. Which of the following is NOT a factor that affects the solubility of a substance? a) Temperature b) Pressure c) pH d) Polarity

36. E. EVALUATING LEARNING E. EVALUATING LEARNING E. EVALUATING LEARNING __________10. Which of the following statements about the solute in a solution is true? The solute is the major component in the solution. The solute particles are larger than 1 nanometer in diameter. The solute particles are evenly distributed throughout the solvent. The solute particles settle out and separate from the solution over time.

37. E. EVALUATING LEARNING E. EVALUATING LEARNING E. EVALUATING LEARNING ANSWERS KEY 1. d) Homogeneous mixture 2. b) Decreases 3. a) Boiling point elevation 4. d) All of the above 5. c) Prevent the flow of water molecules through a semipermeable membrane 6. d) All of the above 7. c) Moles of solute per liter of solution 8. b) Freezing point depression c) pH c) The solute particles are evenly distributed throughout the solvent.

38. Reference : SCIENCE 7 LESSON EXEMPLAR textbooks • Chang, R., & Goldsby, K. A. (2013). Chemistry (11th ed.). McGraw-Hill Education. • Zumdahl , S. S., & Zumdahl , S. A. (2014). Chemistry (9th ed.). Cengage Learning.

39. Online Resources • Khan Academy. (n.d.). Solutions and solubility. https://www.khanacademy.org/science/chemistry/states-of-matter-and-intermolecular-forces/solutions-and-solubility/a/solutions-and-solubility • American Chemical Society. (n.d.). Properties of solutions. https://www.acs.org/content/acs/en/education/resources/highschool/chemmatters/past-issues/2017-2018/december-2017/properties-of-solutions.html • Boundless Chemistry. (n.d.). Colligative properties. https://courses.lumenlearning.com/boundless-chemistry/chapter/colligative-properties/

40. Journal Articles • Atkins, P., & de Paula, J. (2006). Atkins' Physical Chemistry (8th ed.). Oxford University Press. • Raoult , F. M. (1887). Loi générale des tensions de vapeur des dissolvants . Comptes Rendus , 104, 1430-1433. • Van 't Hoff, J. H. (1887). The role of osmotic pressure in the analogy between solutions and gases. Zeitschrift für Physikalische Chemie , 1, 481-508.