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Question 1: According to the Brønsted-Lowry definition, what does an acid do?
- Accepts a hydrogen ion
- Increases hydroxide ions
- Creates a neutral salt
- Donates a hydrogen ion
Answer: D. Donates a hydrogen ion
Explanation: The Brønsted-Lowry theory defines an acid as a substance that can donate a hydrogen ion (H+) to another substance during a chemical reaction.
Question 2: Which of the following is a characteristic property of a base?
- Tastes bitter
- Has a pH below 7
- Turns blue litmus red
- Tastes sour
Answer: A. Tastes bitter
Explanation: Bases are generally characterized by a bitter taste and a slippery feel, whereas acids are known for their sour or tart taste.
Question 3: What is the pH level of a neutral substance?
- 5
- 14
- 0
- 7
Answer: D. 7
Explanation: A neutral substance has a pH of exactly 7, which indicates a perfect balance between hydrogen ions and hydroxide ions in the solution.
Question 4: Which of these substances is considered slightly basic?
- Milk
- Lemon juice
- Banana
- Human blood
Answer: D. Human blood
Explanation: Human blood is slightly basic with a pH of 7.4, while lemons, milk, and bananas all have pH levels that are acidic or near-neutral.
Question 5: What happens when you dip blue litmus paper into an acid?
- It turns green
- It stays blue
- It turns yellow
- It turns red
Answer: D. It turns red
Explanation: Litmus paper is a common indicator; blue litmus paper changes to red when it comes into contact with an acidic substance.
Question 6: What is the result of a neutralization reaction between an acid and a base?
- Only a strong base
- Pure hydrogen gas
- Water and a salt
- Only a strong acid
Answer: C. Water and a salt
Explanation: A neutralization reaction occurs when an acid and a base react to produce water and a salt, typically resulting in a neutral pH of 7.
Question 7: Which pH value represents the strongest acid?
- pH 4
- pH 6
- pH 7
- pH 1
Answer: D. pH 1
Explanation: On the pH scale, substances with a pH less than 7 are acidic, and the lower the number, the higher the concentration of hydrogen ions.
Question 8: Which of these is a common example of a basic substance?
- Lemon
- Banana
- Soap
- Milk
Answer: C. Soap
Explanation: Most soaps are basic, typically measuring around a pH of 12, whereas lemons, milk, and bananas are all acidic substances.
Question 9: What does a base do according to the Brønsted-Lowry definition?
- Donates a hydrogen ion
- Neutralizes all water
- Accepts a hydrogen ion
- Lowers the pH to zero
Answer: C. Accepts a hydrogen ion
Explanation: While an acid donates a hydrogen ion, a base is defined as a substance that can accept or gain a hydrogen ion in a chemical reaction.
Question 10: Why should you never taste or touch strong acids or bases?
- They taste too bitter
- They cause chemical burns
- They are too expensive
- They are always invisible
Answer: B. They cause chemical burns
Explanation: Strong acids and bases are dangerous, poisonous chemicals that can cause severe chemical burns, so they should never be tasted or touched.