혼합물에서 증류법 또는 크로마토그래피 중 하나를 선택하십시오
도입됨| English | 의미 |
|---|---|
| distillate/ˈdɪstɪleɪt/ | 증출액 |
| chromatography/krəʊməˈtɒɡrəfi/ | 색층 분석법 |
What would explain this observation?
- Recovering pure water from salt solution needs the water collected, whereas crystallisation aims to recover salt. The product wanted determines the method.
- Start with a prediction. State the quantities or features you would compare, then decide what evidence could distinguish two explanations.
Build the model
- Simple distillation heats a solution so the volatile solvent vaporises, then cools its vapour in a condenser to collect liquid distillate 馏出液. Non-volatile salt stays in the flask. Fractional distillation separates miscible liquids with different boiling points using repeated vaporisation and condensation in a fractionating column. The lower-boiling component is enriched in vapour reaching the top; separation is not necessarily perfect.
- distillate: Liquid collected after vapour is condensed during distillation; chromatography 色谱法: A separation method based on different distributions between stationary and mobile phases.
소금 용액으로부터 물을 수집하는 데 적합한 방법은 무엇입니까?
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증류(distillation)는 물을 끓여 증발시키고 증기를 응축시켜 순수한 물을-mode collects and leaves the salt behind. Filtration cannot catch a dissolved solute, and salt is not magnetic.
각 전문 용어에 대한 정확한 의미를 매칭하시오.
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정의를 사용하여 유사한 양과 과정을 구분하시오.
Choose evidence that can test it
- Paper chromatography separates soluble components according to their different distributions between the moving solvent and the paper. Draw the baseline in pencil above the solvent level, place a small sample spot and let solvent rise. Components that spend more time in the mobile phase generally travel farther under these conditions. Compare spots with known standards using the same solvent and paper; a single spot alone does not prove purity under every possible method.
- For school-supervised distillation, use a risk-assessed apparatus with an open receiving path, never a sealed heated system. Cooling water enters the lower condenser connection and leaves the upper one. Avoid flames with flammable solvents. In chromatography, keep the lid on the vessel as appropriate, mark the solvent front before it dries and measure all distances from the same baseline. Interpretation of Rf is developed in Chemical analysis, 4.8.1.3.
이 경우 조사 또는 모델이 더 타당하게 만들 수 있는 두 가지 습관은 무엇인가?
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조건과 가정을 명시하면 다른 사람이 정확히 작업을 재현할 수 있으며, 근거 증거를 기록하면 결론을 검증할 수 있습니다. 반대되는 결과를 숨기는 것은 잘못된 결론을 반박할 수 있는 증거를 제거하는 것이며, 한 번의 측정으로는 더 넓은 주장을 입증할 수 없습니다.
Work from known quantities
- State the known values and their units. Choose the relation because its assumptions fit this case, then rearrange before substitution.
- Known: a model distillation starts with 60 cm³ salt solution and collects 42 cm³ water. Collected volume/starting solution volume = 42/60×100 = 70%. This is a volume-recovery comparison, not evidence of 70% purity or a mass balance. In a supplied chromatogram, a dye travelling 30 mm while the front travels 50 mm has Rf = 30/50 = 0.60.
A dye travels 24 mm and the solvent front 40 mm from the baseline. Calculate Rf. Use the same sequence: known quantities → model → relation → substitution → unit and interpretation.
염료가 기준선으로부터 24 mm 이동하고 용매 전선이 40 mm 이동했습니다. Rf를 계산하십시오.
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결과는 0.6입니다. 주어진 값: 염료 이동 거리 24 mm; 용매 전선 이동 거리 40 mm. Rf = 염료 이동 거리 / 용매 전선 이동 거리 공식을 사용합니다. Rf = 24/40 = 0.60입니다. Rf는 단위가 없으며, 절대 1을 초과하지 않습니다.
Check the conclusion and its limits
- A condenser liquefies vapour; it does not filter salt. Fractional distillation concerns boiling-point differences, not density ranking. A chromatogram baseline under solvent can let the sample dissolve directly into the reservoir. The method does not create new dye substances.
- Return to the original observation. Explain what the result supports, which conditions it assumes, and one way to test a competing explanation.
Fractional distillation separates liquids solely because they have different densities. This claim is false: Fractional distillation separates by BOILING POINT: the lower-boiling liquid vaporises first. Liquids of similar density but different boiling points separate easily, so density cannot be the criterion.
Choose distillation or chromatography from the mixture: Paper chromatography separates soluble components according to their different distributions between the moving solvent and the paper. Draw the baseline in pencil above the solvent level, place a small sample spot and let solvent rise. Components that spend more time in the mobile phase generally travel farther under these conditions. Compare spots with known standards using the same solvent and paper; a single spot alone does not prove purity under every possible method.
분馏蒸馏( Fractional distillation)은 액체가 서로 다른 밀도를 가질 뿐 아니라 기화점 차이 때문에 분리됩니다.
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분류 증류는 끓는점 차이를 이용하여 분리합니다: 끓는점이 낮은 액체가 먼저 기화합니다. 밀도는 유사하지만 끓는점이 다른 액체들은 쉽게 분리되므로, 밀도는 분리 기준이 될 수 없습니다.
증류 중 증기가 응축된 후 수집된 액체: 기술 용어를 쓰십시오.
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distillate(증류액)는 증류 중 증기가 응축된 후 수집된 액체를 의미합니다.