Lesson Plan 5

LESSON PLAN Unit : SMPN 1 SITUBONDO Subject : Science. Grade / Terms : VII / 2nd semester. Time : 4 X 40 minutes. Standard Competence: 5. Understanding Characteristic of Acid, Base, and Salt Basic Competence: 5.1 To classify the properties of acid, base and salt using the appropriate tools and indicators. Indicators to achieve competence: 1. To identify the properties of acid, alkali, and salt using a suitable indicator. 2. To classify materials in surrounding environment based on the concepts of acid, alkali and salt using simple tools in determining the degree of acidity and alkalinity. 3. To use simple tools in determining the degree of acidity and alkalinity A. Learning Goal. Students are able to: 1. Differentiate the definitions of acid, base, and salt chemically. 2. Determine characteristic of acid, base, and salt matters. 3. Classify acid, base, and salt matters. 4. Use simple tools in determining the degree of acidity and alkalinity. 5. Summarize and present experiment result. B. Material subjects: Acid, base, and salt. C. Learning method: 1. Learning model: a. Cooperative learning. b. Direct instruction. 2. Method: a. Observation. b. Discussion. D. Activity. 1. First lesson. − − − −

a. Preface activity. • Motivation: Have you ever spread soup solution to your skin? What have you felt? • Experiment prerequisite: Be careful in mixing two different solutions. Be careful in pouring acid solution.

b. Main activity. • •

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Teacher guides students to make groups. Teacher and students discus about acid, base, and salt and then determine their characteristics. Teacher prepares acid, base, and salt solution. Students observe and classify them. Students discus and communicate in groups.

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Teacher and students make summary. Teacher gives spoken test about acid, base and salt.

• c. Closing activity.

2. Second lesson. a. Preface activity. • Motivation: − Have you ever dissolved hibiscus flower and then drop some acid solutions? What’s happen after that? • Prerequisite knowledge: − Mention characteristic of acid, base, and salt! • Prerequisite experiment. − Teacher gives information to students in order to be careful in using sulfite acid. b. Main activity. • Teacher gives instruction to students to do experiment in groups. • Students do experiment using litmus papers or pH sticks to determine the characteristics of acid, base, and salt. • Students discuss to summarize the experiment result. • Students present the discussion result classically. c. Closing activity. • Teacher and students discus to make activity summary. • Teacher gives assignment to find material around house. And then categorize them into acid, alkali, or salt materials. E. Sources. 1. 2. 3. 4.

Student's book. Student’s worksheet. Environmental surroundings. Measurement instruments.

F. Evaluations. 1. Evaluation technique. a. Written test. b. Performance test. 2. Evaluation instruments. a. Multiple choices.

b. Identification test. c. Procedural checklist test. 3. Samples of instruments. a. Essay test. The base characteristics are …. Key: - Contains OH. - Bitter. - If applied to skin to skin become is slippery. b. Identification test. Categorize available materials that have characteristics of acid, base and salt. Prepared materials are vinegar, soap solution, salt solution, sugar solution, salt, and Chlorite acid. Key: - Acid: vinegar, Chlorite acid. - Alkali: soap solution. - Salt: salt solution, NaCl. c. Samples of procedural checklist test. Determine the acidity degree of a substance using available tools. No. 1. 2. 3. 4.

Aspects Accuracy in using PH stick. Do activity by using save procedure. Get data from activity. Make summary. Total score

Score 2 2 2 2 8

STUDENT’S WORKSHEET Objective : •

To identify the characteristics of solutions used in household, using natural indicators.

What Do You Need? 1. Lemon juice 2. Soap solution 3. Vinegar solution 4. Mineral water 5. Hibiscus 6. Pipette 7. Drop palette 8. Toothpick 9. Beaker glass 10. Distilled water Procedure : 1. Make extract hibiscus by grinding it using 5 ml of distilled water in a mortar. 2. Use pipette to pour 5 drops of lemon juice, 5 drops of soap solution, 5 drops of vinegar solution and 5 drops of mineral water in each dent. 3. Pour each of the solution with of 5 drops of hibiscus extract. 4. Stir each solution using toothpicks. 5. Observe the changing color of each solution. 6. Write the color and characteristics of the solution in a table No

Solution

1. 2. 3. 4.

Changing color

Solution characteristic

Lemon Juice Soap Vinegar Mineral water 1.

Do the task 1. Drink such as lemon juice or vinegar are acid or base ? 2. Is soap solution an acid ? 3. Classify the tested solutions based on their characteristic (acid, base or neutral ) 4. What the functions of hibiscus extract ?