1) What happens to blue litmus paper when dipped into an acid? a) It stays the same. b) It turns green. c) It turns blue. d) It turns red. 2) Which of the following solutions is MOST likely to turn red litmus paper blue? a) Baking soda b) Lemon juice c) Soft drinks d) Vinegar 3) If a solution does NOT change the color of red or blue litmus paper, what does this indicate? a) The solution is an acid. b) The solution is neutral. c) The solution is a base. d) The solution is toxic. 4) What will happen if you dip red litmus paper into soapy water? a) It stays the same. b) It disappears. c) It turns blue. d) It turns red. 5) Ben tested an unknown solution with litmus paper. The red litmus paper stayed red, and the blue litmus paper turned red. What type of solution is it? a) Acid b) Base c) Neutral d) Salt 6) Which of the following is an example of a neutral substance? a) Dishwashing liquid b) Dissolved table salt c) Lemon juice d) Vinegar 7) What is the purpose of using litmus paper in testing solutions? a) To check the temperature of the solution. b) To identify if a solution is a solid or liquid. c) To make the solution change color for decoration. d) To determine if a substance is an acid, base, or neutral. 8) Which of the following statements is TRUE about bases? a) They feel slippery and turn red litmus paper blue. b) They taste sour and turn blue litmus paper red. c) They always react with water to form acids. d) They have a pH value lower than 7. 9) Ben tested an unknown liquid and found that it turned blue litmus red but did not affect red litmus paper. What can be concluded? a) The solution is a base. b) The solution is an acid. c) The solution is neutral. d) The solution is neither acid nor base. 10) What is the correct classification of baking soda solution? a) Acid b) Base c) Neutral d) Salt

SOLUTIONS

列印
嵌入

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?