Acids & Bases

13. What color does a base turn universal indicator? A) Red B) Yellow C) Blue or Purple D) Orange

10. Which one is a neutral substance? A) Salt water B) Milk C) Pure water D) Apple juice

5. Which everyday substance is an acid? A) Milk of magnesia B) Toothpaste C) Lemon juice D) Baking soda

11. What is a base? A) Tastes sour B) Turns blue litmus red C) Has a pH above 7 D) Makes gas bubbles in water

15. What do we use to measure how acidic or basic a substance is? A) Thermometer B) Scale C) pH scale D) Timer

18. Which of the following is not commonly used to test acids and bases? A) Litmus paper B) pH paper C) Thermometer D) Universal indicator

4. What color does an acid turn litmus paper? A) Blue B) Green C) Red D) Purple

2. A solution turns universal indicator red. What does this tell us? A) It's neutral B) It's strongly acidic C) It's strongly basic D) It's weakly basic

1. What is the pH range of acids? A) 0–6 B) 7 C) 8–14 D) 5–10

8. What is the pH range of bases? A) 0–6 B) 7 C) 8–14 D) 1–7

12. Which of these substances is acidic? A) Ammonia B) Lemon juice C) Bleach D) Soap

7. Which of these is NOT acidic? A) Lemon B) Vinegar C) Soap D) Cola

14. Orange juice is an acid because it has: A) A pH above 7 B) A sweet taste C) A pH below 7 D) Blue color in water

3. Which of the following is a base? A) Vinegar B) Lemon juice C) Soap D) Orange juice

9. What type of substance is baking soda? A) Acid B) Base C) Neutral D) Salt

6. What is the pH value of a neutral substance like water? A) 0 B) 7 C) 10 D) 14

16. Which of these is the best way to test whether a substance is acidic or basic at home? A) Smell the substance B) Taste it carefully C) Use red cabbage juice as an indicator D) Heat it and observe

17. Lemon juice tastes sour. What does this tell us? A) It is a base B) It is an acid C) It is water D) It is sweet