Chromatography
Gbogbo ọrọ náà
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.
Ebumnobi
- 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.
Akọmọ Ojú-ẹkọ
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ayẹwo Ẹkọ
Ekele diri gi maka imecha ihe karịrị na Chromatography. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- 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
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Ọ dị na ngwa Green Bridge
Budata ngwa Green Bridge CBT na ekwentị maọbụ kọmputa gị iji nweta akwụkwọ ndụmọdụ zuru oke, ajụjụ mmụta, na ndị ọzọ.
Àwọn Ìwé Tó Dáa Láti Kà
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Chromatography? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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