Chromatography
Akopọ
How can you tell whether a coloured food dye is a single substance or a mixture, and what is in it? Chromatography spreads a mixture out across a piece of paper, separating its parts so each can be seen and identified. It is a simple idea with surprising power.
In this lesson you will learn how paper chromatography separates a mixture, why different substances travel different distances, how the Rf value gives each substance a measurable fingerprint, and how a locating agent reveals colourless spots.
Awọn Afojusun
- Describe how paper chromatography is used to separate mixtures of soluble coloured substances, using a suitable solvent.
- Interpret simple chromatograms to identify: (a) unknown substances by comparison with known substances (b) pure and impure substances.
- [Supplement] Describe how paper chromatography is used to separate mixtures of soluble colourless substances, using a suitable solvent and a locating agent Knowledge of specific locating agents is not required.
- [Supplement] State and use the equation for R : f distance travelled by substance R = f distance travelled by solvent.
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Gba ohun èlò Green Bridge CBT sórí fóònù tàbí kọ̀mpútà rẹ fún gbogbo ilé ìkàwé IGCSE: ìwé ìdánwò àtijọ́, ìlànà ìdíwọ̀n, àwòrán èrò, káàdì ìkẹ́kọ̀ọ́ àti ẹ̀kọ́ ohùn.
Ìdánwò Ẹ̀kọ́
Oriire fun ipari ẹkọ lori Chromatography. Ni bayi ti o ti ṣawari naa awọn imọran bọtini ati awọn imọran, o to akoko lati fi imọ rẹ si idanwo. Ẹka yii nfunni ni ọpọlọpọ awọn adaṣe awọn ibeere ti a ṣe lati fun oye rẹ lokun ati ṣe iranlọwọ fun ọ lati ṣe iwọn oye ohun elo naa.
Iwọ yoo pade adalu awọn iru ibeere, pẹlu awọn ibeere olumulo pupọ, awọn ibeere idahun kukuru, ati awọn ibeere iwe kikọ. Gbogbo ibeere kọọkan ni a ṣe pẹlu iṣaro lati ṣe ayẹwo awọn ẹya oriṣiriṣi ti imọ rẹ ati awọn ogbon ironu pataki.
Lo ise abala yii gege bi anfaani lati mu oye re lori koko-ọrọ naa lagbara ati lati ṣe idanimọ eyikeyi agbegbe ti o le nilo afikun ikẹkọ. Maṣe jẹ ki awọn italaya eyikeyi ti o ba pade da ọ lójú; dipo, wo wọn gẹgẹ bi awọn anfaani fun idagbasoke ati ilọsiwaju.
- In paper chromatography, the baseline should be drawn in: A. Ink B. Pencil C. Paint D. Chalk Answer: B
- A substance that is more soluble in the solvent will travel: A. Less far up the paper B. Further up the paper C. Sideways D. Not at all Answer: B
- The Rf value is the distance moved by the substance divided by the: A. Width of the paper B. Distance moved by the solvent front C. Time taken D. Mass of the substance Answer: B
- A substance moves 4 cm and the solvent front moves 8 cm. The Rf value is: A. 0.25 B. 0.5 C. 2 D. 4 Answer: B
- A locating agent is used to: A. Speed up the solvent B. Make colourless spots visible C. Colour the solvent D. Dry the paper Answer: B
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Ṣe Adaṣe Awọn Ibeere Idanwo Adaṣe
Ṣe o fẹ ṣe adaṣe awọn ibeere idanwo adaṣe nipa Chromatography? Ṣe igbasilẹ ohun elo Green Bridge CBT lati wọle si awọn ibeere idanwo adaṣe ati awọn ayẹwo adaṣe kikun fun koko-ọrọ yii.
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