Question

directions: answer each question by circling the correct choice. after you have finished all questions, color the picture on the back using the corresponding color choice.
question\tchoice a\tchoice b\tchoice c

1. which of the following is a property of acids?\tturns red litmus paper blue purple\tph is more than 7 green\tproduces (h+) ions in water orange
2. which of the following is not a property of bases?\tfeels slippery red\tturns blue litmus paper red sky blue\ttastes bitter yellow
3. what rarely reacts with metals?\tacids & bases orange\tacids yellow - green\tbases red
4. which of the following is usually found in cleaning products?\tacids yellow\tbases orange\tacids & bases blue
5. most of the food we eat is...\tbasic red\tneutral green\tacidic purple
6. which of the following reacts with most metals to form hydrogen gas?\tacids blue\tbases yellow - green\tacids & bases sky blue
7. ph values are shown for three different substances. which substance is most acidic?\tph 3 yellow - green\tph 7 yellow\tph 10 red
8. which of the following is corrosive?\tacids green\tbases orange\tacids & bases red
9. an unknown solution with a ph of 8 is a(n)...\tacid yellow\tbase green\tneutral orange
10. which of the following statements is true?\tvinegar (ph of 2) will neutralize an acid. blue\tred litmus paper stays red in acidic solutions. yellow - green\tacids feel soapy. sky blue
11. which of the following statements is false?\tbaking soda (ph of 9) will neutralize a base. sky blue\tbases produce (oh - ) ions in water. blue\tpure water has a neutral ph of 7. pink
12. which of the following statements is true?\tall acids and bases are toxic. purple\tsoap is neutral because it is not harmful to the skin. black\tthe stronger an acid, the lower the ph value. yellow

Explanation:

Step1: Recall acid - base properties

Acids produce $H^+$ ions in water. Bases turn red litmus paper blue, have a pH more than 7, feel slippery, taste bitter, and produce $OH^-$ ions in water. Acids react with metals to form hydrogen gas and are corrosive. A lower pH indicates a more acidic substance.

Step2: Analyze each question

1. Acids produce $H^+$ ions in water, so the answer is C.
2. Bases turn red litmus paper blue, not blue litmus paper red. So the answer is B.
3. Bases rarely react with metals, so the answer is C.
4. Bases are usually found in cleaning products, so the answer is B.
5. Most of the food we eat is acidic, so the answer is C.
6. Acids react with most metals to form hydrogen gas, so the answer is A.
7. A lower pH means more acidic. Among pH 3, pH 7 and pH 10, pH 3 is most acidic, so the answer is A.
8. Acids are corrosive, so the answer is A.
9. A pH of 8 indicates a base, so the answer is B.
10. Red litmus paper stays red in acidic solutions, so the answer is B.
11. Baking Soda (pH of 9) is a base and will not neutralize a base, so the answer is A.
12. The stronger an acid, the lower the pH value, so the answer is C.

Answer:

1. C. produces ($H^+$) ions in water
2. B. turns blue litmus paper red
3. C. bases
4. B. bases
5. C. acidic
6. A. acids
7. A. pH 3
8. A. acids
9. B. base
10. B. Red litmus paper stays red in acidic solutions.
11. A. Baking Soda (pH of 9) will neutralize a base.
12. C. The stronger an acid, the lower the pH value.