Quiz on Acids and Bases for Middle School Science

📚 Quick Study Guide

• 🧪 Acids: Substances that donate hydrogen ions ($H^+$) or accept electrons. They have a sour taste and a pH less than 7.
• 🍋 Examples of Acids: Hydrochloric acid ($HCl$), sulfuric acid ($H_2SO_4$), citric acid ($C_6H_8O_7$).
• ⚗️ Bases: Substances that accept hydrogen ions ($H^+$) or donate electrons. They have a bitter taste and a pH greater than 7.
• 🧼 Examples of Bases: Sodium hydroxide ($NaOH$), ammonia ($NH_3$), potassium hydroxide ($KOH$).
• 🔢 pH Scale: A scale from 0 to 14 that measures the acidity or basicity of a solution. 7 is neutral.
• 💡 Neutralization: The reaction between an acid and a base, which produces water and a salt.
• 📝 Indicators: Substances that change color depending on the pH of the solution, such as litmus paper or phenolphthalein.

🧪 Practice Quiz

1. Which of the following is a characteristic of acids?
   1. A. Tastes bitter
   2. B. Feels slippery
   3. C. Has a pH greater than 7
   4. D. Donates hydrogen ions
2. What is the pH of a neutral solution?
   1. A. 0
   2. B. 7
   3. C. 14
   4. D. 1
3. Which of the following is an example of a base?
   1. A. Hydrochloric acid ($HCl$)
   2. B. Sulfuric acid ($H_2SO_4$)
   3. C. Sodium hydroxide ($NaOH$)
   4. D. Citric acid ($C_6H_8O_7$)
4. What happens during neutralization?
   1. A. An acid becomes stronger
   2. B. A base becomes weaker
   3. C. An acid and a base react to form water and a salt
   4. D. The pH remains unchanged
5. What does an indicator do?
   1. A. Measures the temperature of a solution
   2. B. Changes color depending on the pH of the solution
   3. C. Increases the acidity of a solution
   4. D. Neutralizes a solution
6. Which of these has a pH of less than 7?
   1. A. Soap
   2. B. Lemon Juice
   3. C. Baking Soda
   4. D. Bleach
7. What ion is characteristic of acids?
   1. A. Hydroxide ion ($OH^−$)
   2. B. Sodium ion ($Na^+$)
   3. C. Chloride ion ($Cl^−$)
   4. D. Hydrogen ion ($H^+$)