Acid and Base

Scheme of work

 

Third Term

 

Primary 5

 

Basic Science and Technology

Week : Week 2

Topic : Acid and Base

Content :

1. Acids and bases are two types of chemicals with different properties.
2. Acids have a sour taste and can be found in things like lemon juice, vinegar, and soda.
3. Bases have a bitter taste and are found in things like soap, baking soda, and bleach.
4. Acids and bases can be measured using a pH scale, which ranges from 0 to 14.
5. A pH of 7 is neutral, while values below 7 are acidic and values above 7 are basic.
6. Acids can react with metals and can burn skin and eyes, so they should be handled carefully.
7. Bases can also be dangerous and should be handled with care.
8. Some common uses of acids include cleaning, food preservation, and battery production.
9. Some common uses of bases include cleaning, making soap, and controlling the pH of soil.
10. Acids and bases can sometimes neutralize each other, which can be useful in certain applications.

Evaluation

1. Which of the following tastes sour? a) Acid b) Base c) Neutral
2. Which of the following tastes bitter? a) Acid b) Base c) Neutral
3. Which of the following can be found in lemon juice? a) Acid b) Base c) Neutral
4. Which of the following can be found in baking soda? a) Acid b) Base c) Neutral
5. Which of the following has a pH of 7? a) Acid b) Base c) Neutral
6. Which of the following can react with metals? a) Acid b) Base c) Neutral
7. Which of the following should be handled with care because it can burn skin and eyes? a) Acid b) Base c) Neutral
8. Which of the following can be used to make soap? a) Acid b) Base c) Neutral
9. Which of the following can be used to control the pH of soil? a) Acid b) Base c) Neutral
10. What can acids and bases sometimes do to each other? a) Neutralize b) Magnify c) Amplify

Lesson Plan Presentation 

Title: Introduction to Acids and Bases

Objective: By the end of this lesson, students will be able to understand that there are different types of chemicals called acids and bases that have different properties.

Materials:

• Lemon juice
• Baking soda
• Vinegar
• Water
• Red and blue litmus paper
• Cups
• Spoons

Introduction: Begin by asking the students if they have ever tasted something sour or bitter. Ask them what foods or drinks they think have a sour taste, and what foods or drinks they think have a bitter taste. Then, introduce the concept of acids and bases by explaining that these are two different types of chemicals that can be found in foods, drinks, and other things.

Procedure:

1. Show the students the different materials you have gathered, such as lemon juice, baking soda, and vinegar. Ask the students if they can guess which of these materials might be an acid or a base.
2. Have the students help you mix the lemon juice and baking soda separately with water in different cups. Ask them to observe what happens when you mix these substances together.
3. Use the red and blue litmus paper to show the students how these different substances can change color depending on whether they are an acid or a base.
4. Ask the students to taste a small amount of lemon juice and baking soda, and describe what they taste like.
5. Discuss with the students some common uses of acids and bases, such as cleaning and cooking.
6. Emphasize the importance of being careful when handling acids and bases, as they can be dangerous if not used properly.

Conclusion:

Review the key points of the lesson with the students, such as the differences between acids and bases and some common uses of each. Encourage the students to ask any questions they may have, and remind them to always be careful when handling chemicals. Finally, have the students participate in a short quiz or game to reinforce what they have learned

Weekly Assessment /Test

1. Acids have a __________ taste. a) Sweet b) Sour c) Bitter
2. Bases have a __________ taste. a) Sweet b) Sour c) Bitter
3. Which of the following is an example of an acid? a) Soap b) Water c) Lemon juice
4. Which of the following is an example of a base? a) Salt b) Bleach c) Sugar
5. The pH scale ranges from __________. a) 0 to 10 b) 0 to 12 c) 0 to 14
6. A pH of 7 is considered __________. a) Acidic b) Neutral c) Basic
7. A pH of less than 7 is __________. a) Acidic b) Neutral c) Basic
8. A pH of greater than 7 is __________. a) Acidic b) Neutral c) Basic
9. Acids can react with __________. a) Water b) Metals c) Air
10. Bases can be used to make __________. a) Soap b) Batteries c) Cement
11. Lemon juice is an example of a(n) __________. a) Acid b) Base c) Neutral
12. Bleach is an example of a(n) __________. a) Acid b) Base c) Neutral
13. Acids can burn __________ and __________. a) Eyes and skin b) Hair and nails c) Teeth and tongue
14. Bases can be __________, so they should be handled with care. a) Harmless b) Dangerous c) Invisible
15. Acids can be used for __________. a) Cleaning b) Cooking c) Both a and b
16. Bases can be used for __________. a) Cleaning b) Cooking c) Both a and b
17. The litmus paper turns __________ when in contact with an acid. a) Red b) Blue c) Yellow
18. The litmus paper turns __________ when in contact with a base. a) Red b) Blue c) Yellow
19. When acids and bases react, they can __________ each other. a) Neutralize b) Amplify c) Solidify
20. It is important to __________ when handling acids and bases. a) Drink them b) Touch them with bare hands c) Handle them with care