問 1
1 点What is the primary purpose of the filtration stage in a conventional water treatment plant?
Junior Secondary · Science
Water purification：練習問題
その場で採点される選択問題 5 問と、解説つきの記述問題 5 問。すべて「Water purification」からの出題です。
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問 2
1 点In a municipal Water purification plant, why is the sedimentation process conducted in a large tank with a very low water flow rate?
問 3
1 点A major challenge in modern drinking water purification is controlling the formation of disinfection byproducts (DBPs), such as trihalomethanes (THMs). THMs form when chlorine, the common disinfectant, reacts with residual dissolved organic matter (DOM) present in the water.
If a water treatment facility must continue using chlorine for final disinfection but aims to significantly reduce the concentration of THMs produced, which supplementary step is the most effective strategy to implement immediately before the final chlorination stage?
問 4
1 点In a large-scale water treatment facility, which of the following processes is specifically used to remove large solid particles by allowing them to settle at the bottom of a tank over time?
問 5
1 点A student is building a simple filtration column using sand, gravel, and charcoal. What is the primary function of the sand and gravel layers in Water purification?
問 6
2 点What is the main objective of filtering water during the water purification process?
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 7
3 点Explain why distillation is considered a physical process rather than a chemical process in water purification.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 8
5 点Large-scale reverse osmosis (RO) is an effective method for removing dissolved salts, such as from seawater, producing highly purified water. Explain the specific chemical property issue inherent to this extremely pure RO water that necessitates a mandatory post-treatment step like remineralization or stabilization, and state the two critical problems this remedial step prevents in municipal systems.
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 9
4 点Distillation is a common method used in laboratories to obtain pure water from a mixture.
(a) Explain why distillation can be used to separate dissolved salts from water, whereas simple filtration cannot. (2 points)(b) In a laboratory distillation setup, why is the thermometer bulb placed exactly at the level of the side arm of the flask rather than being dipped into the boiling liquid? (2 points)
まず自分で答えを書いてから、解説と照らし合わせましょう。
問 10
5 点A laboratory setup for distillation is used to obtain pure water from a mixture of salt, sand, and water. A diagram of the apparatus shows a flask connected to a Liebig condenser.
(a) Explain the specific roles of the 'boiling' and 'condensation' processes in separating the water from the salt. (2 points)(b) Why is distillation a more effective Water purification method than filtration if the goal is to remove dissolved minerals? (1 point)
(c) If the mixture contains sand, where will the sand be located at the end of the distillation process? Explain why it does not move to the collection beaker. (2 points)
まず自分で答えを書いてから、解説と照らし合わせましょう。
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