A. Fill in the blanks:
1. Substances that taste sour are generally ________.
2. A base has a ________ taste and feels ________.
3. ________ paper is used to determine whether a substance is acidic or basic.
4. Bases turn litmus paper to blue.
B. Write True or False:
1. All acids taste bitter.
2. Bases are usually slippery to touch.
3. Vinegar is an example of a base.
4. Salt and water are the products of a neutralization reaction.
C. Tick (/) the correct answer:
1. Which of these is a common household base?
(a) Vinegar (b) Baking soda (c) Lemon juice (d) Water
2. What colour does blue litmus paper turn in the presence of an acid?
(a) Red (b) Blue (c) Green (d) Yellow
3. Which of the following is an example of a neutral substance?
(a) Salt (b) Baking soda (c) Lemon juice (d) Vinegar
D. Match each term in Column A with the correct description in Column B.
| Column A | Column B |
|---|---|
| 1. Acid | A. Changes colour in presence of acid or base |
| 2. Base | B. Has a bitter taste and slippery feel |
| 3. Neutralisation | C. Substance with a sour taste |
| 4. Indicator | D. Reaction of acid with base |
| 5. Salt | E. Product of neutralisation |
E. Answer the following questions:
1. What is an indicator and why is it used in testing acids and bases?
2. Describe what happens to litmus paper when it is dipped into vinegar.
Answer (2)
The answers provide various statements and match terms related to acids, bases, and their properties, including the use of indicators. Litmus paper changes color in the presence of acidic or basic substances, showcasing their properties. Concepts such as neutralization are explained accurately, along with examples of common acids and bases.
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Let's address your questions step-by-step:
A. Fill in the blanks:
Substances that taste sour are generally acidic .
A base has a bitter taste and feels slippery .
Litmus paper is used to determine whether a substance is acidic or basic.
Bases turn litmus paper to blue.
B. Write True or False:
All acids taste bitter. False . Acids generally taste sour.
Bases are usually slippery to touch. True .
Vinegar is an example of a base. False . Vinegar is acidic.
Salt and water are the products of a neutralization reaction. True .
C. Tick (/) the correct answer:
Which of these is a common household base? (b) Baking soda
What colour does blue litmus paper turn in the presence of an acid? (a) Red
Which of the following is an example of a neutral substance? (a) Salt
D. Match each term in Column A with the correct description in Column B:
Acid - C. Substance with a sour taste
Base - B. Has a bitter taste and slippery feel
Neutralisation - D. Reaction of acid with base
Indicator - A. Changes colour in presence of acid or base
Salt - E. Product of neutralisation
E. Answer the following questions:
What is an indicator and why is it used in testing acids and bases?
An indicator is a substance that changes color when added to acidic or basic solutions. It is used to determine the acidity or basicity of a substance. For example, litmus paper is an indicator that turns red in acidic environments and blue in basic environments. Indicators help identify the nature of the substance, whether it's acidic or basic.
Describe what happens to litmus paper when it is dipped into vinegar.
When blue litmus paper is dipped into vinegar, which is acidic, it will turn red. This color change indicates the presence of an acid.
