ChemistryChapter 19: Chromatography
Uses
A pure dye should give one spot.
Learning objectives
- Define and explain uses.
- Apply uses to a focused FBISE question.
- Check the answer for correct terms, evidence, working, and units.
Definition
A pure dye should give one spot. Extra spots mean extra substances. Plant-leaf extracts split into several pigments (greens and yellows) because each pigment has a different affinity. Labs may couple the split with spectroscopy to identify a spot more firmly.
Important terms
- Uses
- A pure dye should give one spot. Extra spots mean extra substances. Plant-leaf extracts split into several pigments (greens and yellows) because each pigment has a different affinity. Labs may couple the split with spectroscopy to identify a spot more firmly.
Overview
Learn the idea, then use it:
Core Understanding
A pure dye should give one spot. Extra spots mean extra substances. Plant-leaf extracts split into several pigments (greens and yellows) because each pigment has a different affinity. Labs may couple the split with spectroscopy to identify a spot more firmly.
Examples pure dye · one spot · plant · USES: A pure dye should give one spot. Extra spots mean extra substances. Plant-leaf extracts split into several pigments (gre
Exam Application
State the correct term, connect it to the chapter rule or evidence, and use a clear example or calculation.
Examples Define first · Show the rule or evidence · Check units, labels, and conclusion
WHAT — USES
A pure dye should give one spot. Extra spots mean extra substances. Plant-leaf extracts split into several pigments (greens and yellows) because each pigment has a different affinity. Labs may couple the split with spectroscopy to identify a spot more firmly.
HOW — Use the idea
Identify what is given, select this topic's rule or evidence, apply it one step at a time, and check the result.
In simple words
Do not merge uses with a neighbouring idea that uses a different definition, rule, or method.
Key points
- pure dye
- one spot
- plant
Exam preparation
Exam Focus
Quick revision
Revision Zone
Review the key facts, formulas and checks before you move on.Uses
Sticky Notes · Quick Revision
Core Idea
- A pure dye should give one spot.
Key Points
- pure dye
- one spot
- plant
Simple Check
- Explain uses in your own words and connect it to one chapter example.
How to Answer
- Define the idea, show the main rule or evidence, apply it, and check the final statement.
Common Mistake
- Do not merge uses with a neighbouring idea that uses a different definition, rule, or method.
FBISE Exam Tip
- Use the exact term, show working where needed, and include units or labelled evidence.
60-second revision
- A pure dye should give one spot.
- pure dye
- one spot
- plant
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