Acids and Bases

LESSON – ACIDS AND BASES 

TOPIC 

• Meaning of Acids and Bases

• Properties of Acids and Bases

• Types of Acids and Bases

• Uses of Acids and Bases

MEANING OF ACIDS 

Acids are chemical substances in almost liquid, commonly in unripe fruit.

PROPERTIES OF ACIDS 

The properties of acids are as follows:

1. Acids taste sour.

2. It turns blue litmus paper to red.

3. Strong acids can burn skin when touched.

4. It conducts electricity.

TYPES OF ACIDS

The following are types of acids,

1. Hydrochloric acid

2. Tetraoxosulphate (vi) acid

USES OF ACIDS 

The uses of acids are as follows:

1. It is used for bodies building – fruits and vitamins.

2. It used for manufacturing fertilizer, dye and explosives.

MEANING OF BASES 

Bases are chemical substances opposite to acids.

 

PROPERTIES OF BASES

The properties of bases are as follows:

1. Bases have slippery or soapy feel.

2. Bases turn red litmus paper to blue.

TYPES OF BASES

The following are the types of bases,

1. Sodium hydroxide

2. Potassium hydroxide

USES OF BASES

The uses of bases are as follows:

1. It is used for cleaning.

2. It is used for manufacturing soaps, rayon and paper.

CLOSING REMARKS 

Acids and bases are two kinds of special chemicals.

Some or almost all liquids are either acids or bases to some degree.

Acids taste sour while bases taste bitter.

LESSON EVALUATION 

Answer all the questions.

1. _______ are two kinds of special chemicals.

A. Ripe and unripe fruits

B. Ash and water

C. Acids and Bases

 

2.Some or almost all liquids are either _______ to some degree.

A. Acids

B. Bases

C. Acids or Bases

3. _______ is used for testing acids.

A. Red litmus paper

B. Red and blue litmus paper

C. Blue litmus paper

4. _______ is used for testing bases.

A. Red litmus paper

B. Red and blue litmus paper

C. Blue litmus paper

5. _______ are chemical substances in almost liquid, commonly in unripe fruit.

A. Acids

B. Bases

C. Acids or Bases

6. _______ are chemical substances opposite to acids.

A. Acids

B. Bases

C. Acids or Bases

7. When testing acids, blue litmus paper turns _______.

A. Blue

B. Red

C. Green

 

8. When testing bases, blue litmus paper turns _______.

A. Blue

B. Red

C. Green

9. Acids taste _______ while based taste _______.

A. Sour/sweet

B. Bitter/sweet

C. Sour/bitter

10. State one use of acid and base.

Acid is used for _______.

Base is used for _______.

11. explain the meaning of acids and bases.

12. give 3 examples each of acids.

13. list 2 examples of bases.

14. mention 2 physical properties of acids.

15. state 2 physical properties of bases.

16. differentiate between acids and bases using litmus papers, etc.

17. mention 2 uses of acids.

18. state 2 uses of bases.

19. state 2 types each of acids and bases.